mysql提權之udf
阿新 • • 發佈：2020-12-15
目錄
引言
上一章節，介紹dul的配置，以及如何使用dul進行異常資料恢復。本章節介紹通過dul實現truncate操作的資料恢復。
dul實踐步驟
測試資料生成
SQL> SQL> conn test/test Connected. SQL> create table t_truncate as select * from dba_users; Table created. SQL> ALTER SYSTEM CHECKPOINT; System altered. SQL> select count(1) from t_truncate; COUNT(1) ---------- 35 SQL> truncate table t_truncate; Table truncated. SQL> ALTER SYSTEM CHECKPOINT; System altered. SQL> select count(1) from t_truncate; COUNT(1) ---------- 0
獲取表t_truncate的data_object_id
通過dbms_logmnr包解析redolog或者archivelog，獲取data_object_id，下面案例通過解析redolog
SQL> select GROUP#,THREAD#,SEQUENCE# ,BYTES/1024/1024,STATUS from v$log; GROUP# THREAD# SEQUENCE# BYTES/1024/1024 STATUS ---------- ---------- ---------- --------------- ---------------- 1 1 430 50 INACTIVE 2 1 431 50 CURRENT 3 1 429 50 INACTIVE SQL> col MEMBER for a60 SQL> select GROUP#,MEMBER from v$logfile; GROUP# MEMBER ---------- ------------------------------------------------------------ 3 /u01/app/oracle/oradata/orcl/redo03.log 2 /u01/app/oracle/oradata/orcl/redo02.log 1 /u01/app/oracle/oradata/orcl/redo01.log SQL> EXECUTE dbms_logmnr.add_logfile(LogFileName=>'/u01/app/oracle/oradata/orcl/redo02.log', Options=>dbms_logmnr.new); P/SQL procedure successfully completed. SQL> EXECUTE dbms_logmnr.add_logfile(LogFileName=>'/u01/app/oracle/oradata/orcl/redo01.log',Options=>dbms_logmnr.addfile); PL/SQL procedure successfully completed. SQL> EXECUTE dbms_logmnr.start_logmnr(Options => dbms_logmnr.DICT_FROM_ONLINE_CATALOG); PL/SQL procedure successfully completed. SQL> CREATE TABLE temp1 AS SELECT * FROM v$logmnr_contents; Table created. SQL> EXECUTE dbms_logmnr.end_logmnr(); PL/SQL procedure successfully completed. SQL> col table_name for a10 SQL> col operation for a10 SQL> col data_obj# for 9999999999 SQL> col sql_redo for a60 SQL> set linesize 200 SQL> select t.table_name,t.data_obj#,t.sql_redo,t.timestamp,t.operation from temp1 t where t.table_name = 'T_TRUNCATE'; TABLE_NAME DATA_OBJ# SQL_REDO TIMESTAMP OPERATION ---------- ----------- ------------------------------------------------------------ ------------------- ---------- T_TRUNCATE 161418 create table t_truncate as select * from dba_users; 2019-03-01 02:10:30 DDL T_TRUNCATE 161418 truncate table t_truncate; 2019-03-01 02:11:06 DDL
獲取到T_TRUNCATE的data_object_id為161418留作下一步備用。
配置dul環境
配置init.dul和control.txt引數，以及調整時間參考上一章節。下面進行dul操作
[oracle@zsdb dul]$ ./dul Data UnLoader: 12.0.0.0.0 - Internal Only - on Fri Mar 1 02:22:55 2019 with 64-bit io functions and the decompression option and the parallel option (beta) Copyright (c) 1994 2018 Bernard van Duijnen All rights reserved. Strictly Oracle Internal Use Only DUL: Warning: Recreating file "dul.log" and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries and sorted 0 entries Found db_id = 1581297075 Found db_name = ORCL DUL> show datafiles; ts# rf# start blocks offs open err file name 0 1 0 166401 0 1 0 /home/oracle/dul/system01.dbf 4 4 0 1441 0 1 0 /home/oracle/dul/users01.dbf DUL> SCAN DATAFILE 4; Scanning tablespace 4, data file 4 ... 11 segment header and 1164 data blocks tablespace 4, data file 4: 1439 blocks scanned Reading EXT.dat 29 entries loaded and sorted 29 entries Reading SEG.dat 11 entries loaded Reading COMPATSEG.dat 0 entries loaded Reading SCANNEDLOBPAGE.dat 0 entries loaded and sorted 0 entries DUL> ALTER SESSION SET USE_SCANNED_EXTENT_MAP = TRUE; Parameter altered DUL> scan extents; Scanning extents without segment header Scanning extent id (dba 0, obj 160982) Analyzing segment: data object id 160982 heap organized table DUL: Warning: Column 13: type based on heuristic guessing DUL: Warning: Column 15: type based on heuristic guessing Col Seen Max PCT PRINT NUMBERS DATES TIMESTAMP WITH TZ INTRVAL ROWIDS LOB no count Size NUL 75%100% AnyNice AnyNice AnyNice AnyNice Y2M D2S AnyNice 1 35 21 0 100 100 5 0 0 0 0 0 0 0 0 0 31 0 0 。。。。。。。 Scanning extent id (dba 0, obj 161418) <===========與獲取到的data_object_id一直，下面就是表t_truncate Analyzing segment: data object id 161418 heap organized table DUL: Warning: Column 13: type based on heuristic guessing DUL: Warning: Column 15: type based on heuristic guessing Col Seen Max PCT PRINT NUMBERS DATES TIMESTAMP WITH TZ INTRVAL ROWIDS LOB no count Size NUL 75%100% AnyNice AnyNice AnyNice AnyNice Y2M D2S AnyNice 1 35 21 0 100 100 5 0 0 0 0 0 0 0 0 0 31 0 0 2 35 6 0 0 0 100 100 0 0 0 0 0 0 0 0 2 0 0 3 35 0 100 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 35 16 0 100 100 0 0 0 0 0 0 0 0 0 0 0 0 0 5 35 7 20 0 0 0 0 100 100 0 0 0 0 0 0 0 0 0 6 35 7 0 0 0 0 0 100 100 0 0 0 0 0 0 0 0 0 7 35 7 0 100 100 0 0 0 0 0 0 0 0 0 0 62 0 0 8 35 4 0 100 100 0 0 0 0 0 0 0 0 0 0 0 0 0 9 35 7 0 0 0 0 0 100 100 0 0 0 0 0 0 0 0 0 10 35 18 0 100 100 0 0 0 0 0 0 0 0 0 0 0 0 0 11 35 22 0 100 100 0 0 0 0 0 0 0 0 0 0 0 0 0 12 35 0 100 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13 35 8 2 100 100 0 0 0 0 0 0 0 0 0 0 100 0 0 14 35 1 0 100 100 0 0 0 0 0 0 0 0 0 0 0 0 0 15 35 8 0 100 100 0 0 0 0 0 0 0 0 0 0 100 0 0 "GGS" "86" "" "OPEN" "" "16-MAY-2021 AD 14:16:09" "TBS_GGS" "TEMP" "17-NOV-2020 AD 14:16:09" "DEFAULT" "DEFAULT_CONSUMER_GROUP" "" "10G 11G " "N" "PASSWORD" "V7PRO" "85" "" "OPEN" "" "09-APR-2021 AD 11:42:48" "V7_DATA" "TEMP" "11-OCT-2020 AD 11:42:48" "DEFAULT" "DEFAULT_CONSUMER_GROUP" "" "10G 11G " "N" "PASSWORD" "MICHAEL" "94" "" "OPEN" "" "16-MAY-2021 AD 16:53:51" "USERS" "TEMP" "17-NOV-2020 AD 16:53:51" "DEFAULT" "DEFAULT_CONSUMER_GROUP" "" "10G 11G " "N" "PASSWORD" "WHTEST" "92" "" "OPEN" "" "16-MAY-2021 AD 16:49:56" "USERS" "TEMP" "17-NOV-2020 AD 16:49:56" "DEFAULT" "DEFAULT_CONSUMER_GROUP" "" "10G 11G " "N" "PASSWORD" "TEST" "95" "" "OPEN" "" "09-JUN-2021 AD 14:31:36" "USERS" "TEMP" "11-DEC-2020 AD 14:31:36" "DEFAULT" "DEFAULT_CONSUMER_GROUP" "" "10G 11G " "N" "PASSWORD" UNLOAD TABLE OBJNO161418 ( COL001 VARCHAR2(21), COL002 NUMBER, COL003 CHAR , COL004 VARCHAR2(16), COL005 DATE, COL006 DATE, COL007 VARCHAR2(7) , COL008 VARCHAR2(4), COL009 DATE, COL010 VARCHAR2(18), COL011 VARCHAR2(22) , COL012 CHAR, COL013 VARCHAR2(8), COL014 VARCHAR2(1), COL015 VARCHAR2(8) ) STORAGE( DATAOBJNO 161418 ); 重新拼接SQL DUL> UNLOAD TABLE test.t_truncate ( username VARCHAR2(21), user_id NUMBER, password CHAR 2 , account_status VARCHAR2(16), lock_date DATE, expiry_date DATE, default_tablespace VARCHAR2(7) 3 , temporary_tablespace VARCHAR2(4), created DATE, profile VARCHAR2(18), initial_rsrc_consumer_group VARCHAR2(22) 4 , external_name CHAR, password_versions VARCHAR2(8), editions_enabled VARCHAR2(1), authentication_type VARCHAR2(8) ) 5 STORAGE( DATAOBJNO 161418 ); . unloading table T_TRUNCATE 35 rows unloaded DUL> exit Life is DUL without it [oracle@zsdb dul]$ ll TEST_T_TRUNCATE.dmp -rw-r--r-- 1 oracle oinstall 6519 Mar 1 02:27 TEST_T_TRUNCATE.dmp
匯入測試
[oracle@zsdb dul]$ imp test/test file=/home/oracle/dul/TEST_T_TRUNCATE.dmp full=y ignore=y
Import: Release 11.2.0.3.0 - Production on Fri Mar 1 02:32:08 2019
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export file created by EXPORT:V07.00.07 via conventional path
Warning: the objects were exported by Bernard's DUL, not by you
. importing Bernard's DUL's objects into TEST
. importing Bernard's DUL's objects into TEST
. . importing table "T_TRUNCATE" 35 rows imported
Import terminated successfully without warnings.
[oracle@zsdb dul]$ sqlplus / as sysdba
set pagesize 999
SQL*Plus: Release 11.2.0.3.0 Production on Fri Mar 1 02:32:11 2019
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> SQL> select count(1) from TEST.T_TRUNCATE;
COUNT(1)
----------
35
至此資料恢復成功。