檢視sql執行進度
v$session_longops
This view displays the status of various operations that run for longer than 6 seconds (in absolute time). These operations currently include many backup and recovery functions, statistics gathering, and query execution, and more operations are added for every Oracle release.
To monitor query execution progress, you must be using the cost-based optimizer and you must:
-
Set the
TIMED_STATISTICSorSQL_TRACEparameter totrue -
Gather statistics for your objects with the
ANALYZEstatement or theDBMS_STATSpackage
該檢視記錄了執行時間長於6秒的某個操作(這些操作可能是備份，恢復，收集統計資訊，Hash Join,Sort ,Nested loop，Table Scan, Index Scan 等等)，這個檢視通常用來分析SQL執行緩慢的原因，配合V$SESSION檢視。
1.必須將初始化引數 timed_statistics設定為true或者開啟sql_trace
2.必須用ANALYZE或者DBMS_STATS對物件收集過統計資訊
| Column | Datatype | Description |
|---|---|---|
SID |
NUMBER |
Session identifier |
SERIAL# |
NUMBER |
Session serial number |
OPNAME |
VARCHAR2(64) |
Brief description of the operation |
TARGET |
VARCHAR2(64) |
The object on which the operation is carried out |
TARGET_DESC |
VARCHAR2(32) |
Description of the target |
SOFAR |
NUMBER |
The units of work done so far |
TOTALWORK |
NUMBER |
The total units of work |
UNITS |
VARCHAR2(32) |
The units of measurement |
START_TIME |
DATE |
The starting time of operation |
LAST_UPDATE_TIME |
DATE |
Time when statistics last updated |
TIMESTAMP |
DATE |
Timestamp |
TIME_REMAINING |
NUMBER |
Estimate (in seconds) of time remaining for the operation to complete |
ELAPSED_SECONDS |
NUMBER |
The number of elapsed seconds from the start of operations |
CONTEXT |
NUMBER |
Context |
MESSAGE |
VARCHAR2(512) |
Statistics summary message |
USERNAME |
VARCHAR2(30) |
User ID of the user performing the operation |
SQL_ADDRESS |
RAW(4 | 8) |
Used with the value of theSQL_HASH_VALUEcolumn to identify the SQL statement associated with the operation |
SQL_HASH_VALUE |
NUMBER |
Used with the value of theSQL_ADDRESScolumn to identify the SQL statement associated with the operation |
SQL_ID |
VARCHAR2(13) |
SQL identifier of the SQL statement associated with the operation |
QCSID |
NUMBER |
Session identifier of the parallel coordinator |
SID Session標識 SERIAL# Session串號 OPNAME 操作簡要說明 TARGET 操作執行所在的物件 TARGET_DESC 目標物件說明 SOFAR 至今為止完成的工作量 TOTALWORK 總工作量 UNITS 工作量單位 START_TIME 操作開始時間 LAST_UPDATE_TIME 統計項最後更新時間 TIMESTAMP 操作的時間戳 TIME_REMAINING 預計完成操作的剩餘時間(秒) ELAPSED_SECONDS 從操作開始總花費時間(秒) CONTEXT 前後關係 MESSAGE 統計項的完整描述 USERNAME 執行操作的使用者ID SQL_ADDRESS 關聯v$sql SQL_HASH_VALUE 關聯v$sql SQL_ID 關聯v$sql QCSID 主要是並行查詢一起使用
要理解的就是：比如某個SQL語句執行時間比較長，但是每個操作都沒有超過6秒鐘，那麼你在V$SESSION_LONGOPS這個檢視中就無法查詢到該資訊。
- 相關操作語句：
SELECT USERNAME,
SID,
OPNAME,
ROUND(SOFAR * 100 / TOTALWORK, 0) || '%' AS PROGRESS,
TIME_REMAINING,
SQL_TEXT
FROM V$SESSION_LONGOPS, V$SQL
WHERE TIME_REMAINING <> 0
AND SQL_ADDRESS = ADDRESS
AND SQL_HASH_VALUE = HASH_VALUE;
select * from v$session a,v$session_longops b where a.SID = b.SID and a.SERIAL# = b.SERIAL# ;
select * from v$sql a,v$session_longops b where a.SQL_ID = b.SQL_ID ;
select * from v$sqlarea a,v$session_longops b where a.HASH_VALUE = b.SQL_HASH_VALUE ;
如果是在RAC,改成GV$SESSION_LONGOPS這個檢視
常用：
select a.sofar,a.totalwork ,t.*from v$session_longops a where sofar<>totalwork --越接近說明馬上執行結束
原文地址：https://www.cnblogs.com/willspring/p/5670902.html