1 session 級別設定event
SQL> ALTER SESSION SET EVENTS='10053 trace name context forever, level 1';


Session altered.
2 執行語句
SQL> select /*+10053 test*/* 
  2  from dao_objects1 t1 ,dao_objects2 t2,emp t3
  3  where t1.object_id=t2.object_id
  4  and t2.object_id=t3.empno  ;


3 關閉事件
SQL> ALTER SESSION SET EVENTS '10053 trace name context off';


Session altered.
檢視trace
SQL> !


[
 
[email protected] ~]$ cd /u01/oracle/admin/orcl/udump/


[[email protected] udump]$ ll -t
total 156
-rw-r----- 1 oracle oinstall 77084 Dec  6 20:04 orcl_ora_9177.trc
-rw-r----- 1 oracle oinstall  2279 Dec  6 17:48 orcl_ora_5067.trc
-rw-r----- 1 oracle oinstall   687 Dec  6 17:47 orcl_ora_5019.trc
-rw-r----- 1 oracle oinstall  2221 Sep 11 19:46 orcl_ora_4856.trc
-rw-r----- 1 oracle oinstall   659 Sep 11 19:46 orcl_ora_4810.trc
-rw-r----- 1 oracle oinstall   691 Jun 10 09:08 orcl_ora_6014.trc
-rw-r----- 1 oracle oinstall   903 Jun 10 09:00 orcl_ora_5529.trc
-rw-r----- 1 oracle oinstall   994 Jun 10 09:00 orcl_ora_5478.trc
-rw-r----- 1 oracle oinstall   659 Jun 10 09:00 orcl_ora_5498.trc
-rw-r----- 1 oracle oinstall   903 Jun 10 08:59 orcl_ora_5422.trc
-rw-r----- 1 oracle oinstall   659 Jun 10 08:59 orcl_ora_5394.trc
-rw-r----- 1 oracle oinstall   994 Jun 10 08:59 orcl_ora_5390.trc
-rw-r----- 1 oracle oinstall  1281 Jun 10 08:59 orcl_ora_5388.trc
-rw-r----- 1 oracle oinstall   762 Jun 10 08:59 orcl_ora_5364.trc
-rw-r----- 1 oracle oinstall   722 Jun 10 08:59 orcl_ora_5346.trc
-rw-r----- 1 oracle oinstall   953 Jun 10 08:59 orcl_ora_5334.trc
-rw-r----- 1 oracle oinstall  2923 Jun 10 08:58 orcl_ora_5286.trc
-rw-r----- 1 oracle oinstall   659 Jun 10 08:58 orcl_ora_5260.trc
-rw-r----- 1 oracle oinstall  1066 Jun 10 08:58 orcl_ora_5258.trc
-rw-r----- 1 oracle oinstall   659 Jun 10 08:58 orcl_ora_5205.trc
[
 
[email protected] udump]$ cat orcl_ora_9177.trc 
--一些環境資訊
/u01/oracle/admin/orcl/udump/orcl_ora_9177.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /u01/oracle/product/OraHome
System name:    Linux
Node name:      server
Release:        2.6.18-274.el5
Version:        #1 SMP Fri Jul 8 17:36:59 EDT 2011
Machine:        x86_64
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 9177, image: 
 
[email protected] (TNS V1-V3)






*** 2015-12-06 20:04:48.796
*** ACTION NAME:() 2015-12-06 20:04:48.796
*** MODULE NAME:(SQL*Plus) 2015-12-06 20:04:48.796
*** SERVICE NAME:(SYS$USERS) 2015-12-06 20:04:48.796
*** SESSION ID:(159.5) 2015-12-06 20:04:48.796
Registered qb: SEL$1 0x77a8eae0 (PARSER)
  signature (): qb_name=SEL$1 nbfros=3 flg=0
    fro(0): flg=4 objn=52978 hint_alias="T1"@"SEL$1"
    fro(1): flg=4 objn=52983 hint_alias="T2"@"SEL$1"
    fro(2): flg=4 objn=52984 hint_alias="T3"@"SEL$1"
**************************  --開始各種嘗試改寫
Predicate Move-Around (PM)
**************************
PM: Considering predicate move-around in SEL$1 (#0).
PM:   Checking validity of predicate move-around in SEL$1 (#0).
CBQT: Validity checks failed for 5p2ahbv0mbgm8.
Query block (0x2ac377a8eae0) before join elimination:
SQL:******* UNPARSED QUERY IS *******
SELECT "T1"."OWNER" "OWNER","T1"."OBJECT_NAME" "OBJECT_NAME","T1"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T1"."OBJECT_ID" "OBJECT_ID","T1"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T1"."OBJECT_TYPE" "OBJECT_TYPE","T1"."CREATED" "CREATED","T1"."LAST_DDL_TIME" "LAST_DDL_TIME","T1"."TIMESTAMP" "TIMESTAMP","T1"."STATUS" "STATUS","T1"."TEMPORARY" "TEMPORARY","T1"."GENERATED" "GENERATED","T1"."SECONDARY" "SECONDARY","T2"."OWNER" "OWNER","T2"."OBJECT_NAME" "OBJECT_NAME","T2"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T2"."OBJECT_ID" "OBJECT_ID","T2"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T2"."OBJECT_TYPE" "OBJECT_TYPE","T2"."CREATED" "CREATED","T2"."LAST_DDL_TIME" "LAST_DDL_TIME","T2"."TIMESTAMP" "TIMESTAMP","T2"."STATUS" "STATUS","T2"."TEMPORARY" "TEMPORARY","T2"."GENERATED" "GENERATED","T2"."SECONDARY" "SECONDARY","T3"."EMPNO" "EMPNO","T3"."ENAME" "ENAME","T3"."JOB" "JOB","T3"."MGR" "MGR","T3"."HIREDATE" "HIREDATE","T3"."SAL" "SAL","T3"."COMM" "COMM","T3"."DEPTNO" "DEPTNO" FROM "DAO"."DAO_OBJECTS1" "T1","DAO"."DAO_OBJECTS2" "T2","DAO"."EMP" "T3" WHERE "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
Query block (0x2ac377a8eae0) unchanged
CVM: Considering view merge in query block SEL$1 (#0)
Query block (0x2ac377a8eae0) before join elimination:
SQL:******* UNPARSED QUERY IS *******
SELECT "T1"."OWNER" "OWNER","T1"."OBJECT_NAME" "OBJECT_NAME","T1"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T1"."OBJECT_ID" "OBJECT_ID","T1"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T1"."OBJECT_TYPE" "OBJECT_TYPE","T1"."CREATED" "CREATED","T1"."LAST_DDL_TIME" "LAST_DDL_TIME","T1"."TIMESTAMP" "TIMESTAMP","T1"."STATUS" "STATUS","T1"."TEMPORARY" "TEMPORARY","T1"."GENERATED" "GENERATED","T1"."SECONDARY" "SECONDARY","T2"."OWNER" "OWNER","T2"."OBJECT_NAME" "OBJECT_NAME","T2"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T2"."OBJECT_ID" "OBJECT_ID","T2"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T2"."OBJECT_TYPE" "OBJECT_TYPE","T2"."CREATED" "CREATED","T2"."LAST_DDL_TIME" "LAST_DDL_TIME","T2"."TIMESTAMP" "TIMESTAMP","T2"."STATUS" "STATUS","T2"."TEMPORARY" "TEMPORARY","T2"."GENERATED" "GENERATED","T2"."SECONDARY" "SECONDARY","T3"."EMPNO" "EMPNO","T3"."ENAME" "ENAME","T3"."JOB" "JOB","T3"."MGR" "MGR","T3"."HIREDATE" "HIREDATE","T3"."SAL" "SAL","T3"."COMM" "COMM","T3"."DEPTNO" "DEPTNO" FROM "DAO"."DAO_OBJECTS1" "T1","DAO"."DAO_OBJECTS2" "T2","DAO"."EMP" "T3" WHERE "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
Query block (0x2ac377a8eae0) unchanged
CBQT: Validity checks failed for 5p2ahbv0mbgm8.
***************
Subquery Unnest
***************
SU: Considering subquery unnesting in query block SEL$1 (#0)
*************************
Set-Join Conversion (SJC)
*************************
SJC: Considering set-join conversion in SEL$1 (#0).
**************************
Predicate Move-Around (PM)
**************************
PM: Considering predicate move-around in SEL$1 (#0).
PM:   Checking validity of predicate move-around in SEL$1 (#0).
PM:     PM bypassed: Outer query contains no views.
FPD: Considering simple filter push in SEL$1 (#0)
FPD:   Current where clause predicates in SEL$1 (#0) :
         "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
kkogcp: try to generate transitive predicate from check constraints for SEL$1 (#0)
predicates with check contraints: "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
after transitive predicate generation: "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
finally: "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
apadrv-start: call(in-use=6160, alloc=16344), compile(in-use=56144, alloc=58808)
kkoqbc-start
            : call(in-use=6168, alloc=16344), compile(in-use=57640, alloc=58808)
kkoqbc-subheap (create addr=0x2ac377a8c2c0)
****************************************** 
Current SQL statement for this session:    --當前SQL
select /*+10053 test*/*
from dao_objects1 t1 ,dao_objects2 t2,emp t3
where t1.object_id=t2.object_id
and t2.object_id=t3.empno  
*******************************************


--關於改寫的各種名詞簡稱
Legend
The following abbreviations are used by optimizer trace.
CBQT - cost-based query transformation
JPPD - join predicate push-down
FPD - filter push-down
PM - predicate move-around
CVM - complex view merging
SPJ - select-project-join
SJC - set join conversion
SU - subquery unnesting
OBYE - order by elimination
ST - star transformation
qb - query block
LB - leaf blocks
DK - distinct keys
LB/K - average number of leaf blocks per key
DB/K - average number of data blocks per key
CLUF - clustering factor
NDV - number of distinct values
Resp - response cost
Card - cardinality
Resc - resource cost
NL - nested loops (join)
SM - sort merge (join)
HA - hash (join)
CPUCSPEED - CPU Speed 
IOTFRSPEED - I/O transfer speed
IOSEEKTIM - I/O seek time
SREADTIM - average single block read time
MREADTIM - average multiblock read time
MBRC - average multiblock read count
MAXTHR - maximum I/O system throughput
SLAVETHR - average slave I/O throughput
dmeth - distribution method
  1: no partitioning required
  2: value partitioned
  4: right is random (round-robin)
  512: left is random (round-robin)
  8: broadcast right and partition left
  16: broadcast left and partition right
  32: partition left using partitioning of right
  64: partition right using partitioning of left
  128: use hash partitioning dimension
  256: use range partitioning dimension
  2048: use list partitioning dimension
  1024: run the join in serial
  0: invalid distribution method
sel - selectivity
ptn - partition
*******************************************
Peeked values of the binds in SQL statement
*******************************************
***************************************
PARAMETERS USED BY THE OPTIMIZER
********************************
  *************************************
  PARAMETERS WITH ALTERED VALUES
  ******************************
  *********************************
  Bug Fix Control Environment  --各種以修復未修復的bug
  ***************************
  fix  4611850 = enabled
  fix  4663804 = enabled
  fix  4663698 = enabled
  fix  4545833 = enabled
  fix  3499674 = disabled
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  fix  4550003 = enabled
  fix  4488689 = enabled
  fix  3118776 = enabled
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  fix  4556762 = 15      
  fix  4728348 = enabled
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  fix  4554846 = enabled
  fix  4175830 = enabled
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  fix  5765456 = 0       
  fix  6494943 = enabled
  fix  6251917 = enabled
  fix  6087237 = enabled
  fix  6239971 = enabled
  fix  6062266 = enabled
  fix  5520732 = 0       
  fix  6151963 = enabled
  fix  4567767 = enabled
  fix  6007259 = enabled
  fix  6694548 = enabled
  fix  6923730 = 0       
  fix  6468287 = enabled
  fix  6714199 = enabled
  fix  3801750 = enabled
  fix  5902962 = enabled
  fix  3056297 = enabled
  fix  6440977 = disabled
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  fix  5466973 = enabled
  fix  6138746 = enabled
  fix  6399597 = disabled
  fix  6029469 = enabled
  fix  6073325 = enabled
  fix  5648287 = 3       
  fix  6670551 = disabled
  fix  5416118 = 1       
  fix  5714944 = enabled
  fix  6617866 = enabled
  fix  6329318 = enabled
  fix  6972291 = disabled
  fix  6434668 = enabled
  fix  5893768 = enabled
  fix  7345484 = enabled
  fix  6688831 = disabled
  fix  5284200 = enabled
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  fix  5406763 = enabled
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  fix  4663702 = enabled
  fix  6282944 = enabled
  fix  7170213 = enabled
  fix  5844495 = enabled
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  fix  6530596 = enabled
  fix  6120483 = enabled
  fix  7325597 = enabled
  fix  7298570 = enabled
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  fix  6528872 = enabled
  fix  6119382 = enabled
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  fix  6365442 = enabled
  fix  7555510 = enabled
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  fix  7576476 = enabled
  fix  7295298 = enabled
  fix  6326934 = enabled
  fix  6771838 = enabled
  fix  7521266 = enabled
  fix  6669103 = enabled
  fix  7259468 = enabled
  fix  7597059 = enabled
  fix  6773613 = enabled
  fix  6782437 = enabled
  fix  6897034 = enabled
  fix  6994194 = enabled
  fix  5936366 = enabled
  fix  3320140 = enabled
  fix  5578791 = enabled
  fix  6990305 = enabled
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  fix  5922070 = enabled
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  fix  7676897 = disabled
  fix  3628118 = enabled
  fix  7281191 = enabled
  fix  7692248 = disabled
  fix  7116357 = enabled
  fix  6012093 = 1       
  fix  7512227 = enabled
  fix  7891471 = disabled
  fix  5394888 = enabled
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  fix  7534257 = enabled
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  fix  7176746 = enabled
  fix  7375077 = enabled
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  fix  8544722 = disabled
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  fix  7675944 = enabled
  fix  8619631 = disabled
  fix  8213977 = enabled
  fix  4444536 = disabled
  fix  8602185 = enabled
  fix  8323407 = enabled
  fix  8287870 = enabled
  fix  8467123 = enabled
  fix  8560951 = disabled
  fix  8725296 = disabled
  fix  8371884 = enabled
  fix  5099019 = disabled
  fix  7289023 = enabled
  fix  7148689 = enabled
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  fix  6671155 = enabled
  fix  6656356 = enabled
  fix  5554865 = enabled
  fix  6503543 = disabled
  fix  7032684 = enabled
  fix  8855396 = enabled
  *************************************  --各種隱含引數
  PARAMETERS WITH DEFAULT VALUES
  ******************************
  optimizer_mode_hinted               = false
  optimizer_features_hinted           = 0.0.0
  parallel_execution_enabled          = true
  parallel_query_forced_dop           = 0
  parallel_dml_forced_dop             = 0
  parallel_ddl_forced_degree          = 0
  parallel_ddl_forced_instances       = 0
  _query_rewrite_fudge                = 90
  optimizer_features_enable           = 10.2.0.5
  _optimizer_search_limit             = 5
  cpu_count                           = 1
  active_instance_count               = 1
  parallel_threads_per_cpu            = 2
  hash_area_size                      = 131072
  bitmap_merge_area_size              = 1048576
  sort_area_size                      = 65536
  sort_area_retained_size             = 0
  _sort_elimination_cost_ratio        = 0
  _optimizer_block_size               = 8192
  _sort_multiblock_read_count         = 2
  _hash_multiblock_io_count           = 0
  _db_file_optimizer_read_count       = 16
  _optimizer_max_permutations         = 2000
  pga_aggregate_target                = 194560 KB
  _pga_max_size                       = 204800 KB
  _query_rewrite_maxdisjunct          = 257
  _smm_auto_min_io_size               = 56 KB
  _smm_auto_max_io_size               = 248 KB
  _smm_min_size                       = 194 KB
  _smm_max_size                       = 38912 KB
  _smm_px_max_size                    = 97280 KB
  _cpu_to_io                          = 0
  _optimizer_undo_cost_change         = 10.2.0.5
  parallel_query_mode                 = enabled
  parallel_dml_mode                   = disabled
  parallel_ddl_mode                   = enabled
  optimizer_mode                      = all_rows
  sqlstat_enabled                     = false
  _optimizer_percent_parallel         = 101
  _always_anti_join                   = choose
  _always_semi_join                   = choose
  _optimizer_mode_force               = true
  _partition_view_enabled             = true
  _always_star_transformation         = false
  _query_rewrite_or_error             = false
  _hash_join_enabled                  = true
  cursor_sharing                      = exact
  _b_tree_bitmap_plans                = true
  star_transformation_enabled         = false
  _optimizer_cost_model               = choose
  _new_sort_cost_estimate             = true
  _complex_view_merging               = true
  _unnest_subquery                    = true
  _eliminate_common_subexpr           = true
  _pred_move_around                   = true
  _convert_set_to_join                = false
  _push_join_predicate                = true
  _push_join_union_view               = true
  _fast_full_scan_enabled             = true
  _optim_enhance_nnull_detection      = true
  _parallel_broadcast_enabled         = true
  _px_broadcast_fudge_factor          = 100
  _ordered_nested_loop                = true
  _no_or_expansion                    = false
  optimizer_index_cost_adj            = 100
  optimizer_index_caching             = 0
  _system_index_caching               = 0
  _disable_datalayer_sampling         = false
  query_rewrite_enabled               = true
  query_rewrite_integrity             = enforced
  _query_cost_rewrite                 = true
  _query_rewrite_2                    = true
  _query_rewrite_1                    = true
  _query_rewrite_expression           = true
  _query_rewrite_jgmigrate            = true
  _query_rewrite_fpc                  = true
  _query_rewrite_drj                  = true
  _full_pwise_join_enabled            = true
  _partial_pwise_join_enabled         = true
  _left_nested_loops_random           = true
  _improved_row_length_enabled        = true
  _index_join_enabled                 = true
  _enable_type_dep_selectivity        = true
  _improved_outerjoin_card            = true
  _optimizer_adjust_for_nulls         = true
  _optimizer_degree                   = 0
  _use_column_stats_for_function      = true
  _subquery_pruning_enabled           = true
  _subquery_pruning_mv_enabled        = false
  _or_expand_nvl_predicate            = true
  _like_with_bind_as_equality         = false
  _table_scan_cost_plus_one           = true
  _cost_equality_semi_join            = true
  _default_non_equality_sel_check     = true
  _new_initial_join_orders            = true
  _oneside_colstat_for_equijoins      = true
  _optim_peek_user_binds              = true
  _minimal_stats_aggregation          = true
  _force_temptables_for_gsets         = false
  workarea_size_policy                = auto
  _smm_auto_cost_enabled              = true
  _gs_anti_semi_join_allowed          = true
  _optim_new_default_join_sel         = true
  optimizer_dynamic_sampling          = 2
  _pre_rewrite_push_pred              = true
  _optimizer_new_join_card_computation = true
  _union_rewrite_for_gs               = yes_gset_mvs
  _generalized_pruning_enabled        = true
  _optim_adjust_for_part_skews        = true
  _force_datefold_trunc               = false
  statistics_level                    = typical
  _optimizer_system_stats_usage       = true
  skip_unusable_indexes               = true
  _remove_aggr_subquery               = true
  _optimizer_push_down_distinct       = 0
  _dml_monitoring_enabled             = true
  _optimizer_undo_changes             = false
  _predicate_elimination_enabled      = true
  _nested_loop_fudge                  = 100
  _project_view_columns               = true
  _local_communication_costing_enabled = true
  _local_communication_ratio          = 50
  _query_rewrite_vop_cleanup          = true
  _slave_mapping_enabled              = true
  _optimizer_cost_based_transformation = linear
  _optimizer_mjc_enabled              = true
  _right_outer_hash_enable            = true
  _spr_push_pred_refspr               = true
  _optimizer_cache_stats              = false
  _optimizer_cbqt_factor              = 50
  _optimizer_squ_bottomup             = true
  _fic_area_size                      = 131072
  _optimizer_skip_scan_enabled        = true
  _optimizer_cost_filter_pred         = false
  _optimizer_sortmerge_join_enabled   = true
  _optimizer_join_sel_sanity_check    = true
  _mmv_query_rewrite_enabled          = true
  _bt_mmv_query_rewrite_enabled       = true
  _add_stale_mv_to_dependency_list    = true
  _distinct_view_unnesting            = false
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  _optimizer_compute_index_stats      = true
  _push_join_union_view2              = true
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  _optimizer_random_plan              = 0
  _query_rewrite_setopgrw_enable      = true
  _optimizer_correct_sq_selectivity   = true
  _disable_function_based_index       = false
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  _optimizer_cartesian_enabled        = true
  _optimizer_starplan_enabled         = true
  _extended_pruning_enabled           = true
  _optimizer_push_pred_cost_based     = true
  _sql_model_unfold_forloops          = run_time
  _enable_dml_lock_escalation         = false
  _bloom_filter_enabled               = true
  _update_bji_ipdml_enabled           = 0
  _optimizer_extended_cursor_sharing  = udo
  _dm_max_shared_pool_pct             = 1
  _optimizer_cost_hjsmj_multimatch    = true
  _optimizer_transitivity_retain      = true
  _px_pwg_enabled                     = true
  optimizer_secure_view_merging       = true
  _optimizer_join_elimination_enabled = true
  flashback_table_rpi                 = non_fbt
  _optimizer_cbqt_no_size_restriction = true
  _optimizer_enhanced_filter_push     = true
  _optimizer_filter_pred_pullup       = true
  _rowsrc_trace_level                 = 0
  _simple_view_merging                = true
  _optimizer_rownum_pred_based_fkr    = true
  _optimizer_better_inlist_costing    = all
  _optimizer_self_induced_cache_cost  = false
  _optimizer_min_cache_blocks         = 10
  _optimizer_or_expansion             = depth
  _optimizer_order_by_elimination_enabled = true
  _optimizer_outer_to_anti_enabled    = true
  _selfjoin_mv_duplicates             = true
  _dimension_skip_null                = true
  _force_rewrite_enable               = false
  _optimizer_star_tran_in_with_clause = true
  _optimizer_complex_pred_selectivity = true
  _optimizer_connect_by_cost_based    = true
  _gby_hash_aggregation_enabled       = true
  _globalindex_pnum_filter_enabled    = true
  _fix_control_key                    = 0
  _optimizer_skip_scan_guess          = false
  _enable_row_shipping                = false
  _row_shipping_threshold             = 80
  _row_shipping_explain               = false
  _optimizer_rownum_bind_default      = 10
  _first_k_rows_dynamic_proration     = true
  _px_ual_serial_input                = true
  _with_subquery                      = OPTIMIZER
  _optimizer_native_full_outer_join   = off
  _optimizer_star_trans_min_cost      = 0
  _optimizer_star_trans_min_ratio     = 0
  _optimizer_fkr_index_cost_bias      = 10
  _optimizer_connect_by_combine_sw    = true
  _optimizer_use_subheap              = true
  _optimizer_or_expansion_subheap     = true
  _optimizer_sortmerge_join_inequality = true
  _optimizer_use_histograms           = true
  _optimizer_enable_density_improvements = false
  _mv_generalized_oj_refresh_opt      = true
  _optimizer_connect_by_cb_whr_only   = false
  *********************************
  Bug Fix Control Environment             --各種以修復未修復的bug
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  ***************************************
  PARAMETERS IN OPT_PARAM HINT  --是否使用OPT_PARAM 提示改的引數
  ****************************
***************************************
Column Usage Monitoring is ON: tracking level = 1
***************************************
****************
QUERY BLOCK TEXT
****************
select /*+10053 test*/*
from dao_objects1 t1 ,dao_objects2 t2,emp t3
where t1.object_id=t2.object_id
and t2.object_id=t3.empno  
*********************
QUERY BLOCK SIGNATURE    --語句塊標記
*********************
qb name was generated
signature (optimizer): qb_name=SEL$1 nbfros=3 flg=0
  fro(0): flg=0 objn=52978 hint_alias="T1"@"SEL$1"
  fro(1): flg=0 objn=52983 hint_alias="T2"@"SEL$1"
  fro(2): flg=0 objn=52984 hint_alias="T3"@"SEL$1"
*****************************
SYSTEM STATISTICS INFORMATION  --假設系統統計資訊
*****************************
  Using NOWORKLOAD Stats
  CPUSPEED: 714 millions instruction/sec                     CPU頻率
  IOTFRSPEED: 4096 bytes per millisecond (default is 4096)  IO傳輸時間
  IOSEEKTIM: 10 milliseconds (default is 10)                IO找尋時間
***************************************
BASE STATISTICAL INFORMATION
***********************
Table Stats::
  Table: EMP  Alias: T3  (NOT ANALYZED)
    #Rows: 327  #Blks:  4  AvgRowLen:  100.00
  Column (#1): EMPNO(NUMBER)  NO STATISTICS (using defaults)
    AvgLen: 13.00 NDV: 10 Nulls: 0 Density: 0.097859
***********************
Table Stats::
  Table: DAO_OBJECTS2  Alias: T2  (NOT ANALYZED)
    #Rows: 58483  #Blks:  716  AvgRowLen:  100.00
  Column (#4): OBJECT_ID(NUMBER)  NO STATISTICS (using defaults)
    AvgLen: 13.00 NDV: 1828 Nulls: 0 Density: 5.4717e-04
***********************
Table Stats::
  Table: DAO_OBJECTS1  Alias: T1  (NOT ANALYZED)
    #Rows: 58483  #Blks:  716  AvgRowLen:  100.00
  Column (#4): OBJECT_ID(NUMBER)  NO STATISTICS (using defaults)
    AvgLen: 13.00 NDV: 1828 Nulls: 0 Density: 5.4717e-04
Index Stats::
  Index: IDX_OBJECTS1  Col#: 4
    LVLS: 1  #LB: 112  #DK: 50625  LB/K: 1.00  DB/K: 1.00  CLUF: 1110.00
  Index: IDX_OBJECTS2  Col#: 2
    LVLS: 1  #LB: 249  #DK: 30262  LB/K: 1.00  DB/K: 1.00  CLUF: 25016.00
  Index: IDX_OBJECTS3  Col#: 6
    LVLS: 1  #LB: 140  #DK: 41  LB/K: 3.00  DB/K: 53.00  CLUF: 2209.00
  Index: IDX_OBJECTS4  Col#: 1
    LVLS: 1  #LB: 117  #DK: 27  LB/K: 4.00  DB/K: 49.00  CLUF: 1342.00
***************************************
SINGLE TABLE ACCESS PATH
  -----------------------------------------
  BEGIN Single Table Cardinality Estimation
  -----------------------------------------
*** 2015-12-06 20:04:48.804
** Performing dynamic sampling initial checks. **
** Dynamic sampling initial checks returning TRUE (level = 2).
** Dynamic sampling updated index stats.: IDX_OBJECTS1, blocks=123
** Dynamic sampling updated table stats.: blocks=716
*** 2015-12-06 20:04:48.805
** Generated dynamic sampling query:  --這段動態取樣
    query text : 
SELECT /* OPT_DYN_SAMP */ /*+ ALL_ROWS IGNORE_WHERE_CLAUSE NO_PARALLEL(SAMPLESUB) opt_param('parallel_execution_enabled', 'false') NO_PARALLEL_INDEX(SAMPLESUB) NO_SQL_TUNE */ NVL(SUM(C1),0), NVL(SUM(C2),0), COUNT(DISTINCT C3), NVL(SUM(CASE WHEN C3 IS NULL THEN 1 ELSE 0 END),0) FROM (SELECT /*+ NO_PARALLEL("T1") FULL("T1") NO_PARALLEL_INDEX("T1") */ 1 AS C1, 1 AS C2, "T1"."OBJECT_ID" AS C3 FROM "DAO_OBJECTS1" SAMPLE BLOCK (8.798883 , 1) SEED (1) "T1") SAMPLESUB
*** 2015-12-06 20:04:48.811
** Executed dynamic sampling query:
    level : 2
    sample pct. : 8.798883
    actual sample size : 4374
    filtered sample card. : 4374
    orig. card. : 58483
    block cnt. table stat. : 716
    block cnt. for sampling: 716
    max. sample block cnt. : 64
    sample block cnt. : 63
    ndv C3 : 4374
        scaled : 49710.00
    nulls C4 : 0
        scaled : 0.00
    min. sel. est. : -1.00000000
** Dynamic sampling col. stats.:
  Column (#4): OBJECT_ID(NUMBER)  Part#: 0
    AvgLen: 22.00 NDV: 49710 Nulls: 0 Density: 2.0117e-05
** Using dynamic sampling NULLs estimates.
** Using dynamic sampling NDV estimates.
   Scaled NDVs using cardinality = 49711.
** Using dynamic sampling card. : 49711
** Dynamic sampling updated table card.
  Table: DAO_OBJECTS1  Alias: T1     
    Card: Original: 49711  Rounded: 49711  Computed: 49710.86  Non Adjusted: 49710.86
  -----------------------------------------
  END   Single Table Cardinality Estimation
  -----------------------------------------
  Access Path: TableScan
    Cost:  160.86  Resp: 160.86  Degree: 0
      Cost_io: 158.00  Cost_cpu: 24486241
      Resp_io: 158.00  Resp_cpu: 24486241
  Best:: AccessPath: TableScan
         Cost: 160.86  Degree: 1  Resp: 160.86  Card: 49710.86  Bytes: 0
***************************************
SINGLE TABLE ACCESS PATH
  -----------------------------------------
  BEGIN Single Table Cardinality Estimation
  -----------------------------------------
*** 2015-12-06 20:04:48.811
** Performing dynamic sampling initial checks. **
** Dynamic sampling initial checks returning TRUE (level = 2).
** Dynamic sampling updated table stats.: blocks=716
*** 2015-12-06 20:04:48.811
** Generated dynamic sampling query:
    query text : 
SELECT /* OPT_DYN_SAMP */ /*+ ALL_ROWS IGNORE_WHERE_CLAUSE NO_PARALLEL(SAMPLESUB) opt_param('parallel_execution_enabled', 'false') NO_PARALLEL_INDEX(SAMPLESUB) NO_SQL_TUNE */ NVL(SUM(C1),0), NVL(SUM(C2),0), COUNT(DISTINCT C3), NVL(SUM(CASE WHEN C3 IS NULL THEN 1 ELSE 0 END),0) FROM (SELECT /*+ NO_PARALLEL("T2") FULL("T2") NO_PARALLEL_INDEX("T2") */ 1 AS C1, 1 AS C2, "T2"."OBJECT_ID" AS C3 FROM "DAO_OBJECTS2" SAMPLE BLOCK (8.798883 , 1) SEED (1) "T2") SAMPLESUB
*** 2015-12-06 20:04:48.814
** Executed dynamic sampling query:
    level : 2
    sample pct. : 8.798883
    actual sample size : 3720
    filtered sample card. : 3720
    orig. card. : 58483
    block cnt. table stat. : 716
    block cnt. for sampling: 716
    max. sample block cnt. : 64
    sample block cnt. : 63
    ndv C3 : 3720
        scaled : 42278.00
    nulls C4 : 0
        scaled : 0.00
    min. sel. est. : -1.00000000
** Dynamic sampling col. stats.:
  Column (#4): OBJECT_ID(NUMBER)  Part#: 0
    AvgLen: 22.00 NDV: 42278 Nulls: 0 Density: 2.3653e-05
** Using dynamic sampling NULLs estimates.
** Using dynamic sampling NDV estimates.
   Scaled NDVs using cardinality = 42278.
** Using dynamic sampling card. : 42278
** Dynamic sampling updated table card.
  Table: DAO_OBJECTS2  Alias: T2     
    Card: Original: 42278  Rounded: 42278  Computed: 42278.10  Non Adjusted: 42278.10
  -----------------------------------------
  END   Single Table Cardinality Estimation
  -----------------------------------------
  Access Path: TableScan
    Cost:  160.52  Resp: 160.52  Degree: 0
      Cost_io: 158.00  Cost_cpu: 21587501
      Resp_io: 158.00  Resp_cpu: 21587501
  Best:: AccessPath: TableScan
         Cost: 160.52  Degree: 1  Resp: 160.52  Card: 42278.10  Bytes: 0
***************************************
SINGLE TABLE ACCESS PATH
  -----------------------------------------
  BEGIN Single Table Cardinality Estimation
  -----------------------------------------
*** 2015-12-06 20:04:48.814
** Performing dynamic sampling initial checks. **
** Dynamic sampling initial checks returning TRUE (level = 2).
** Dynamic sampling updated table stats.: blocks=4
*** 2015-12-06 20:04:48.814
** Generated dynamic sampling query:
    query text : 
SELECT /* OPT_DYN_SAMP */ /*+ ALL_ROWS IGNORE_WHERE_CLAUSE NO_PARALLEL(SAMPLESUB) opt_param('parallel_execution_enabled', 'false') NO_PARALLEL_INDEX(SAMPLESUB) NO_SQL_TUNE */ NVL(SUM(C1),0), NVL(SUM(C2),0), COUNT(DISTINCT C3), NVL(SUM(CASE WHEN C3 IS NULL THEN 1 ELSE 0 END),0) FROM (SELECT /*+ NO_PARALLEL("T3") FULL("T3") NO_PARALLEL_INDEX("T3") */ 1 AS C1, 1 AS C2, "T3"."EMPNO" AS C3 FROM "EMP" "T3") SAMPLESUB
*** 2015-12-06 20:04:48.814
** Executed dynamic sampling query:
    level : 2
    sample pct. : 100.000000
    actual sample size : 14
    filtered sample card. : 14
    orig. card. : 327
    block cnt. table stat. : 4
    block cnt. for sampling: 4
    max. sample block cnt. : 64
    sample block cnt. : 4
    ndv C3 : 14
        scaled : 14.00
    nulls C4 : 0
        scaled : 0.00
    min. sel. est. : -1.00000000
** Dynamic sampling col. stats.:
  Column (#1): EMPNO(NUMBER)  Part#: 0
    AvgLen: 22.00 NDV: 14 Nulls: 0 Density: 0.071429
** Using dynamic sampling NULLs estimates.
** Using dynamic sampling NDV estimates.
   Scaled NDVs using cardinality = 14.
** Using dynamic sampling card. : 14
** Dynamic sampling updated table card.
  Table: EMP  Alias: T3     
    Card: Original: 14  Rounded: 14  Computed: 14.00  Non Adjusted: 14.00
  -----------------------------------------
  END   Single Table Cardinality Estimation
  -----------------------------------------
  Access Path: TableScan
    Cost:  3.00  Resp: 3.00  Degree: 0
      Cost_io: 3.00  Cost_cpu: 32546
      Resp_io: 3.00  Resp_cpu: 32546
  Best:: AccessPath: TableScan
         Cost: 3.00  Degree: 1  Resp: 3.00  Card: 14.00  Bytes: 0
***************************************
OPTIMIZER STATISTICS AND COMPUTATIONS  --優化器統計資訊計算
***************************************
GENERAL PLANS
***************************************
Considering cardinality-based initial join order.  --考慮使用基數來決定連線方式
Permutations for Starting Table :0
***********************
Join order[1]:  EMP[T3]#0  DAO_OBJECTS2[T2]#1  DAO_OBJECTS1[T1]#2
***************
Now joining: DAO_OBJECTS2[T2]#1  如果使用NL
***************
NL Join
  Outer table: Card: 14.00  Cost: 3.00  Resp: 3.00  Degree: 1  Bytes: 87
  Inner table: DAO_OBJECTS2  Alias: T2
  Access Path: TableScan
    NL Join:  Cost: 2232.28  Resp: 2232.28  Degree: 1
      Cost_io: 2197.00  Cost_cpu: 302258680
      Resp_io: 2197.00  Resp_cpu: 302258680
  Best NL cost: 2232.28
          resc: 2232.28 resc_io: 2197.00 resc_cpu: 302258680
          resp: 2232.28 resp_io: 2197.00 resp_cpu: 302258680
Join Card:  14.00 = outer (14.00) * inner (42278.10) * sel (2.3653e-05)
Join Card - Rounded: 14 Computed: 14.00
--如果使用sort merge
SM Join
  Outer table: 
    resc: 3.00  card 14.00  bytes: 87  deg: 1  resp: 3.00
  Inner table: DAO_OBJECTS2  Alias: T2
    resc: 160.52  card: 42278.10  bytes: 177  deg: 1  resp: 160.52
    using dmeth: 2  #groups: 1
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:       1 Row size:          106 Total Rows:             14
      Initial runs:         1 Merge passes:        0 IO Cost / pass:          0
      Total IO sort cost: 0      Total CPU sort cost: 8569266
      Total Temp space used: 0
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1062 Row size:          205 Total Rows:          42278
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        576
      Total IO sort cost: 1638      Total CPU sort cost: 63992179
      Total Temp space used: 17785000
  SM join: Resc: 1809.99  Resp: 1809.99  [multiMatchCost=0.00]
  SM cost: 1809.99
     resc: 1809.99 resc_io: 1799.00 resc_cpu: 94181492
     resp: 1809.99 resp_io: 1799.00 resp_cpu: 94181492
--如果使用hash join
HA Join
  Outer table: 
    resc: 3.00  card 14.00  bytes: 87  deg: 1  resp: 3.00
  Inner table: DAO_OBJECTS2  Alias: T2
    resc: 160.52  card: 42278.10  bytes: 177  deg: 1  resp: 160.52
    using dmeth: 2  #groups: 1
    Cost per ptn: 0.99  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 1  probefrag: 976  ppasses: 1
  Hash join: Resc: 164.52  Resp: 164.52  [multiMatchCost=0.00]
  HA cost: 164.52
     resc: 164.52 resc_io: 161.00 resc_cpu: 30133379
     resp: 164.52 resp_io: 161.00 resp_cpu: 30133379
Best:: JoinMethod: Hash
       Cost: 164.52  Degree: 1  Resp: 164.52  Card: 14.00  Bytes: 264
***************
Now joining: DAO_OBJECTS1[T1]#2 
***************
NL Join
  Outer table: Card: 14.00  Cost: 164.52  Resp: 164.52  Degree: 1  Bytes: 264
  Inner table: DAO_OBJECTS1  Alias: T1
  Access Path: TableScan
    NL Join:  Cost: 2398.53  Resp: 2398.53  Degree: 1
      Cost_io: 2355.00  Cost_cpu: 372940754
      Resp_io: 2355.00  Resp_cpu: 372940754
  Access Path: index (AllEqJoinGuess)
    Index: IDX_OBJECTS1
    resc_io: 2.00  resc_cpu: 16273
    ix_sel: 2.0117e-05  ix_sel_with_filters: 2.0117e-05
    NL Join: Cost: 192.54  Resp: 192.54  Degree: 1
      Cost_io: 189.00  Cost_cpu: 30361199
      Resp_io: 189.00  Resp_cpu: 30361199
  Best NL cost: 192.54
          resc: 192.54 resc_io: 189.00 resc_cpu: 30361199
          resp: 192.54 resp_io: 189.00 resp_cpu: 30361199
Join Card:  14.00 = outer (14.00) * inner (49710.86) * sel (2.0117e-05)
Join Card - Rounded: 14 Computed: 14.00
SM Join
  Outer table: 
    resc: 164.52  card 14.00  bytes: 264  deg: 1  resp: 164.52
  Inner table: DAO_OBJECTS1  Alias: T1
    resc: 160.86  card: 49710.86  bytes: 177  deg: 1  resp: 160.86
    using dmeth: 2  #groups: 1
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:       1 Row size:          301 Total Rows:             14
      Initial runs:         1 Merge passes:        0 IO Cost / pass:          0
      Total IO sort cost: 0      Total CPU sort cost: 8569266
      Total Temp space used: 0
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1248 Row size:          205 Total Rows:          49711
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        676
      Total IO sort cost: 1924      Total CPU sort cost: 74242412
      Total Temp space used: 20898000
  SM join: Resc: 2259.04  Resp: 2259.04  [multiMatchCost=0.00]
  SM cost: 2259.04
     resc: 2259.04 resc_io: 2243.00 resc_cpu: 137431298
     resp: 2259.04 resp_io: 2243.00 resp_cpu: 137431298
HA Join
  Outer table: 
    resc: 164.52  card 14.00  bytes: 264  deg: 1  resp: 164.52
  Inner table: DAO_OBJECTS1  Alias: T1
    resc: 160.86  card: 49710.86  bytes: 177  deg: 1  resp: 160.86
    using dmeth: 2  #groups: 1
    Cost per ptn: 1.08  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 1  probefrag: 1147  ppasses: 1
  Hash join: Resc: 326.46  Resp: 326.46  [multiMatchCost=0.00]
  HA cost: 326.46
     resc: 326.46 resc_io: 319.00 resc_cpu: 63876252
     resp: 326.46 resp_io: 319.00 resp_cpu: 63876252
Best:: JoinMethod: NestedLoop
       Cost: 192.54  Degree: 1  Resp: 192.54  Card: 14.00  Bytes: 441
***********************
Best so far: Table#: 0  cost: 3.0038  card: 14.0000  bytes: 1218
             Table#: 1  cost: 164.5174  card: 14.0000  bytes: 3696
             Table#: 2  cost: 192.5440  card: 14.0003  bytes: 6174
***********************
Join order[2]:  EMP[T3]#0  DAO_OBJECTS1[T1]#2  DAO_OBJECTS2[T2]#1  --第二種連線順序
***************
Now joining: DAO_OBJECTS1[T1]#2
***************
NL Join
  Outer table: Card: 14.00  Cost: 3.00  Resp: 3.00  Degree: 1  Bytes: 87
  Inner table: DAO_OBJECTS1  Alias: T1
  Access Path: TableScan
    NL Join:  Cost: 2237.02  Resp: 2237.02  Degree: 1
      Cost_io: 2197.00  Cost_cpu: 342839920
      Resp_io: 2197.00  Resp_cpu: 342839920
  Best NL cost: 2237.02
          resc: 2237.02 resc_io: 2197.00 resc_cpu: 342839920
          resp: 2237.02 resp_io: 2197.00 resp_cpu: 342839920
Join Card:  695952.00 = outer (14.00) * inner (49710.86) * sel (1)
Join Card - Rounded: 695952 Computed: 695952.00
Join order aborted: cost > best plan cost
***********************
***********************
Join order[3]:  DAO_OBJECTS2[T2]#1  EMP[T3]#0  DAO_OBJECTS1[T1]#2  --第三種連線順序
***************
Now joining: EMP[T3]#0
***************
NL Join
  Outer table: Card: 42278.10  Cost: 160.52  Resp: 160.52  Degree: 1  Bytes: 177
  Inner table: EMP  Alias: T3
  Access Path: TableScan
    NL Join:  Cost: 37316.14  Resp: 37316.14  Degree: 1
      Cost_io: 37153.00  Cost_cpu: 1397557142
      Resp_io: 37153.00  Resp_cpu: 1397557142
  Best NL cost: 37316.14
          resc: 37316.14 resc_io: 37153.00 resc_cpu: 1397557142
          resp: 37316.14 resp_io: 37153.00 resp_cpu: 1397557142
Join Card:  14.00 = outer (42278.10) * inner (14.00) * sel (2.3653e-05)
Join Card - Rounded: 14 Computed: 14.00
SM Join
  Outer table: 
    resc: 160.52  card 42278.10  bytes: 177  deg: 1  resp: 160.52
  Inner table: EMP  Alias: T3
    resc: 3.00  card: 14.00  bytes: 87  deg: 1  resp: 3.00
    using dmeth: 2  #groups: 1
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1062 Row size:          205 Total Rows:          42278
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        576
      Total IO sort cost: 1638      Total CPU sort cost: 63992179
      Total Temp space used: 17785000
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:       1 Row size:          106 Total Rows:             14
      Initial runs:         1 Merge passes:        0 IO Cost / pass:          0
      Total IO sort cost: 0      Total CPU sort cost: 8569266
      Total Temp space used: 0
  SM join: Resc: 1809.99  Resp: 1809.99  [multiMatchCost=0.00]
  SM cost: 1809.99
     resc: 1809.99 resc_io: 1799.00 resc_cpu: 94181492
     resp: 1809.99 resp_io: 1799.00 resp_cpu: 94181492
HA Join
  Outer table: 
    resc: 160.52  card 42278.10  bytes: 177  deg: 1  resp: 160.52
  Inner table: EMP  Alias: T3
    resc: 3.00  card: 14.00  bytes: 87  deg: 1  resp: 3.00
    using dmeth: 2  #groups: 1
    Cost per ptn: 380.71  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 976  probefrag: 1  ppasses: 1
  Hash join: Resc: 544.23  Resp: 544.23  [multiMatchCost=0.00]
HA Join (swap)
  Outer table: 
    resc: 3.00  card 14.00  bytes: 87  deg: 1  resp: 3.00
  Inner table: DAO_OBJECTS2  Alias: T2
    resc: 160.52  card: 42278.10  bytes: 177  deg: 1  resp: 160.52
    using dmeth: 2  #groups: 1
    Cost per ptn: 0.99  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 1  probefrag: 976  ppasses: 1
  Hash join: Resc: 164.52  Resp: 164.52  [multiMatchCost=0.00]
  HA cost: 164.52
     resc: 164.52 resc_io: 161.00 resc_cpu: 30133379
     resp: 164.52 resp_io: 161.00 resp_cpu: 30133379
Best:: JoinMethod: Hash
       Cost: 164.52  Degree: 1  Resp: 164.52  Card: 14.00  Bytes: 264
***************
Now joining: DAO_OBJECTS1[T1]#2
***************
NL Join
  Outer table: Card: 14.00  Cost: 164.52  Resp: 164.52  Degree: 1  Bytes: 264
  Inner table: DAO_OBJECTS1  Alias: T1
  Access Path: TableScan
    NL Join:  Cost: 2398.53  Resp: 2398.53  Degree: 1
      Cost_io: 2355.00  Cost_cpu: 372940754
      Resp_io: 2355.00  Resp_cpu: 372940754
  Access Path: index (AllEqJoinGuess)
    Index: IDX_OBJECTS1
    resc_io: 2.00  resc_cpu: 16273
    ix_sel: 2.0117e-05  ix_sel_with_filters: 2.0117e-05
    NL Join: Cost: 192.54  Resp: 192.54  Degree: 1
      Cost_io: 189.00  Cost_cpu: 30361199
      Resp_io: 189.00  Resp_cpu: 30361199
  Best NL cost: 192.54
          resc: 192.54 resc_io: 189.00 resc_cpu: 30361199
          resp: 192.54 resp_io: 189.00 resp_cpu: 30361199
Join Card:  14.00 = outer (14.00) * inner (49710.86) * sel (2.0117e-05)
Join Card - Rounded: 14 Computed: 14.00
SM Join
  Outer table: 
    resc: 164.52  card 14.00  bytes: 264  deg: 1  resp: 164.52
  Inner table: DAO_OBJECTS1  Alias: T1
    resc: 160.86  card: 49710.86  bytes: 177  deg: 1  resp: 160.86
    using dmeth: 2  #groups: 1
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:       1 Row size:          301 Total Rows:             14
      Initial runs:         1 Merge passes:        0 IO Cost / pass:          0
      Total IO sort cost: 0      Total CPU sort cost: 8569266
      Total Temp space used: 0
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1248 Row size:          205 Total Rows:          49711
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        676
      Total IO sort cost: 1924      Total CPU sort cost: 74242412
      Total Temp space used: 20898000
  SM join: Resc: 2259.04  Resp: 2259.04  [multiMatchCost=0.00]
  SM cost: 2259.04
     resc: 2259.04 resc_io: 2243.00 resc_cpu: 137431298
     resp: 2259.04 resp_io: 2243.00 resp_cpu: 137431298
HA Join
  Outer table: 
    resc: 164.52  card 14.00  bytes: 264  deg: 1  resp: 164.52
  Inner table: DAO_OBJECTS1  Alias: T1
    resc: 160.86  card: 49710.86  bytes: 177  deg: 1  resp: 160.86
    using dmeth: 2  #groups: 1
    Cost per ptn: 1.08  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 1  probefrag: 1147  ppasses: 1
  Hash join: Resc: 326.46  Resp: 326.46  [multiMatchCost=0.00]
  HA cost: 326.46
     resc: 326.46 resc_io: 319.00 resc_cpu: 63876252
     resp: 326.46 resp_io: 319.00 resp_cpu: 63876252
Join order aborted: cost > best plan cost
***********************
***********************
Join order[4]:  DAO_OBJECTS2[T2]#1  DAO_OBJECTS1[T1]#2  EMP[T3]#0  --第四重連線順序
***************
Now joining: DAO_OBJECTS1[T1]#2
***************
NL Join
  Outer table: Card: 42278.10  Cost: 160.52  Resp: 160.52  Degree: 1  Bytes: 177
  Inner table: DAO_OBJECTS1  Alias: T1
  Access Path: TableScan
    NL Join:  Cost: 6742794.61  Resp: 6742794.61  Degree: 1
      Cost_io: 6621951.00  Cost_cpu: 1035250886190
      Resp_io: 6621951.00  Resp_cpu: 1035250886190
  Access Path: index (AllEqJoinGuess)
    Index: IDX_OBJECTS1
    resc_io: 2.00  resc_cpu: 16273
    ix_sel: 2.0117e-05  ix_sel_with_filters: 2.0117e-05
    NL Join: Cost: 84796.83  Resp: 84796.83  Degree: 1
      Cost_io: 84714.00  Cost_cpu: 709572322
      Resp_io: 84714.00  Resp_cpu: 709572322
  Best NL cost: 84796.83
          resc: 84796.83 resc_io: 84714.00 resc_cpu: 709572322
          resp: 84796.83 resp_io: 84714.00 resp_cpu: 709572322
Join Card:  42278.82 = outer (42278.10) * inner (49710.86) * sel (2.0117e-05)
Join Card - Rounded: 42279 Computed: 42278.82
SM Join
  Outer table: 
    resc: 160.52  card 42278.10  bytes: 177  deg: 1  resp: 160.52
  Inner table: DAO_OBJECTS1  Alias: T1
    resc: 160.86  card: 49710.86  bytes: 177  deg: 1  resp: 160.86
    using dmeth: 2  #groups: 1
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1062 Row size:          205 Total Rows:          42278
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        576
      Total IO sort cost: 1638      Total CPU sort cost: 63992179
      Total Temp space used: 17785000
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1248 Row size:          205 Total Rows:          49711
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        676
      Total IO sort cost: 1924      Total CPU sort cost: 74242412
      Total Temp space used: 20898000
  SM join: Resc: 3899.51  Resp: 3899.51  [multiMatchCost=0.00]
  SM cost: 3899.51
     resc: 3899.51 resc_io: 3878.00 resc_cpu: 184308333
     resp: 3899.51 resp_io: 3878.00 resp_cpu: 184308333
HA Join
  Outer table: 
    resc: 160.52  card 42278.10  bytes: 177  deg: 1  resp: 160.52
  Inner table: DAO_OBJECTS1  Alias: T1
    resc: 160.86  card: 49710.86  bytes: 177  deg: 1  resp: 160.86
    using dmeth: 2  #groups: 1
    Cost per ptn: 825.42  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 976  probefrag: 1147  ppasses: 1
  Hash join: Resc: 1146.80  Resp: 1146.80  [multiMatchCost=0.00]
  HA cost: 1146.80
     resc: 1146.80 resc_io: 1138.00 resc_cpu: 75350579
     resp: 1146.80 resp_io: 1138.00 resp_cpu: 75350579
Join order aborted: cost > best plan cost
***********************
***********************
Join order[5]:  DAO_OBJECTS1[T1]#2  EMP[T3]#0  DAO_OBJECTS2[T2]#1
***************
Now joining: EMP[T3]#0
***************
NL Join
  Outer table: Card: 49710.86  Cost: 160.86  Resp: 160.86  Degree: 1  Bytes: 177
  Inner table: EMP  Alias: T3
  Access Path: TableScan
    NL Join:  Cost: 43848.71  Resp: 43848.71  Degree: 1
      Cost_io: 43657.00  Cost_cpu: 1642368516
      Resp_io: 43657.00  Resp_cpu: 1642368516
  Best NL cost: 43848.71
          resc: 43848.71 resc_io: 43657.00 resc_cpu: 1642368516
          resp: 43848.71 resp_io: 43657.00 resp_cpu: 1642368516
Join Card:  695952.00 = outer (49710.86) * inner (14.00) * sel (1)
Join Card - Rounded: 695952 Computed: 695952.00
Join order aborted: cost > best plan cost
***********************
***********************
Join order[6]:  DAO_OBJECTS1[T1]#2  DAO_OBJECTS2[T2]#1  EMP[T3]#0
***************
Now joining: DAO_OBJECTS2[T2]#1
***************
NL Join
  Outer table: Card: 49710.86  Cost: 160.86  Resp: 160.86  Degree: 1  Bytes: 177
  Inner table: DAO_OBJECTS2  Alias: T2
  Access Path: TableScan
    NL Join:  Cost: 7911414.25  Resp: 7911414.25  Degree: 1
      Cost_io: 7786145.00  Cost_cpu: 1073164727320
      Resp_io: 7786145.00  Resp_cpu: 1073164727320
  Best NL cost: 7911414.25
          resc: 7911414.25 resc_io: 7786145.00 resc_cpu: 1073164727320
          resp: 7911414.25 resp_io: 7786145.00 resp_cpu: 1073164727320
Join Card:  42278.82 = outer (49710.86) * inner (42278.10) * sel (2.0117e-05)
Join Card - Rounded: 42279 Computed: 42278.82
SM Join
  Outer table: 
    resc: 160.86  card 49710.86  bytes: 177  deg: 1  resp: 160.86
  Inner table: DAO_OBJECTS2  Alias: T2
    resc: 160.52  card: 42278.10  bytes: 177  deg: 1  resp: 160.52
    using dmeth: 2  #groups: 1
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1248 Row size:          205 Total Rows:          49711
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        676
      Total IO sort cost: 1924      Total CPU sort cost: 74242412
      Total Temp space used: 20898000
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1062 Row size:          205 Total Rows:          42278
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        576
      Total IO sort cost: 1638      Total CPU sort cost: 63992179
      Total Temp space used: 17785000
  SM join: Resc: 3899.51  Resp: 3899.51  [multiMatchCost=0.00]
  SM cost: 3899.51
     resc: 3899.51 resc_io: 3878.00 resc_cpu: 184308333
     resp: 3899.51 resp_io: 3878.00 resp_cpu: 184308333
SM Join (with index on outer)
  Access Path: index (FullScan)
    Index: IDX_OBJECTS1
    resc_io: 1234.00  resc_cpu: 38656607
    ix_sel: 1  ix_sel_with_filters: 1
    Cost: 1238.51  Resp: 1238.51  Degree: 1
  Outer table: 
    resc: 1238.51  card 49710.86  bytes: 177  deg: 1  resp: 1238.51
  Inner table: DAO_OBJECTS2  Alias: T2
    resc: 160.52  card: 42278.10  bytes: 177  deg: 1  resp: 160.52
    using dmeth: 2  #groups: 1
    SORT resource      Sort statistics
      Sort width:         226 Area size:      198656 Max Area size:    39845888
      Degree:               1
      Blocks to Sort:    1062 Row size:          205 Total Rows:          42278
      Initial runs:         2 Merge passes:        1 IO Cost / pass:        576
      Total IO sort cost: 1638      Total CPU sort cost: 63992179
      Total Temp space used: 17785000
  SM join: Resc: 3044.50  Resp: 3044.50  [multiMatchCost=0.00]
HA Join
  Outer table: 
    resc: 160.86  card 49710.86  bytes: 177  deg: 1  resp: 160.86
  Inner table: DAO_OBJECTS2  Alias: T2
    resc: 160.52  card: 42278.10  bytes: 177  deg: 1  resp: 160.52
    using dmeth: 2  #groups: 1
    Cost per ptn: 825.37  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 1147  probefrag: 976  ppasses: 1
  Hash join: Resc: 1146.75  Resp: 1146.75  [multiMatchCost=0.00]
HA Join (swap)
  Outer table: 
    resc: 160.52  card 42278.10  bytes: 177  deg: 1  resp: 160.52
  Inner table: DAO_OBJECTS1  Alias: T1
    resc: 160.86  card: 49710.86  bytes: 177  deg: 1  resp: 160.86
    using dmeth: 2  #groups: 1
    Cost per ptn: 825.42  #ptns: 1
    hash_area: 124 (max=9728) buildfrag: 976  probefrag: 1147  ppasses: 1
  Hash join: Resc: 1146.80  Resp: 1146.80  [multiMatchCost=0.00]
  HA cost: 1146.80
     resc: 1146.80 resc_io: 1138.00 resc_cpu: 75350579
     resp: 1146.80 resp_io: 1138.00 resp_cpu: 75350579
Join order aborted: cost > best plan cost
***********************
(newjo-stop-1) k:0, spcnt:0, perm:6, maxperm:2000
*********************************
Number of join permutations tried: 6
*********************************
(newjo-save)    [0 1 2 ]
Final - All Rows Plan:  Best join order: 1
  Cost: 192.5440  Degree: 1  Card: 14.0000  Bytes: 6174