查看真實的執行計劃 綁定變量對執行計劃的影響--「綁定變量窺探」
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-#####################################################
- -#### AWR執行計劃 ####
- -#####################################################
SELECT TF.* FROM DBA_HIST_SQLTEXT HT, TABLE(DBMS_XPLAN.DISPLAY_AWR(HT.SQL_ID, NULL, NULL, 'all')) TF WHERE HT.SQL_TEXT LIKE '%mac%';
- -#####################################################
- -#### dbms_xplan.display_cursor方式查看 ####
- -#####################################################
SQL > conn cqwr /cqwr
SELECT T_LTE_CARD_INFO.PK,
T_LTE_CARD_INFO.IMSI,
T_LTE_CARD_INFO.ICCID,
T_LTE_CARD_INFO.PIN1,
T_LTE_CARD_INFO.PIN2,
T_LTE_CARD_INFO.PUK1,
T_LTE_CARD_INFO.PUK2,
T_LTE_CARD_INFO.KI,
T_LTE_CARD_INFO.EKI,
T_LTE_CARD_INFO.STATUS
FROM T_LTE_CARD_INFO SAMPLE ( 5),
T_HLR_MSISDN
WHERE T_HLR_MSISDN.HLR_PK = 'HLR12'
AND T_LTE_CARD_INFO.SUB_IMSI = '46002'
AND T_LTE_CARD_INFO.MSISDN = T_HLR_MSISDN.PK
AND ROWNUM < = 5
select A.SQL_ID,A.HASH_VALUE,A.CHILD_NUMBER,A.SQL_TEXT from v$ sql a where A.SQL_TEXT like 'SELECT T_LTE_CARD_INFO.PK,%'
- - 0jq118yf3w76u 2621316314 0
- -#### AWR執行計劃 ####
- -#####################################################
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_AWR('8qfs8857jc8fw',NULL,NULL,'ADVANCED'));
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_AWR('8qfs8857jc8fw'))
- -#####################################################
- -#### dbms_xplan.display_cursor方式查看 ####
- -#####################################################
SQL > conn cqwr /cqwr
SELECT T_LTE_CARD_INFO.PK,
T_LTE_CARD_INFO.IMSI,
T_LTE_CARD_INFO.ICCID,
T_LTE_CARD_INFO.PIN1,
T_LTE_CARD_INFO.PIN2,
T_LTE_CARD_INFO.PUK1,
T_LTE_CARD_INFO.PUK2,
T_LTE_CARD_INFO.KI,
T_LTE_CARD_INFO.EKI,
T_LTE_CARD_INFO.STATUS
FROM T_LTE_CARD_INFO SAMPLE ( 5),
T_HLR_MSISDN
WHERE T_HLR_MSISDN.HLR_PK = 'HLR12'
AND T_LTE_CARD_INFO.SUB_IMSI = '46002'
AND T_LTE_CARD_INFO.MSISDN = T_HLR_MSISDN.PK
AND ROWNUM < = 5
select A.SQL_ID,A.HASH_VALUE,A.CHILD_NUMBER,A.SQL_TEXT from v$ sql a where A.SQL_TEXT like 'SELECT T_LTE_CARD_INFO.PK,%'
- - 0jq118yf3w76u 2621316314 0
-
-
傳入HASH_VALUE
select * from table (dbms_xplan.display_cursor( 2621316314 , 0 , 'ADVANCED' ));
- - 傳入SQL_ID
- - - 爲了獲取緩存庫中的執行計劃，能夠直接查詢動態性能視圖v$sql_plan和v$sql_plan_statistics_all等，但更方便的方法是：
select t. * from v$ sql s, table (dbms_xplan.display_cursor(s.sql_id,s.child_number, 'allstats last' )) t where s.sql_id = '0jq118yf3w76u' ;
- - - 當前查看的方式以下
SQL > select * from table (dbms_xplan.display_cursor);
PLAN_TABLE_OUTPUT
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SQL_ID b4vp4vx8q5jny, child number 0
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SELECT T_LTE_CARD_INFO.PK, T_LTE_CARD_INFO.IMSI, T_LTE_CARD_INFO.ICCID,
T_LTE_CARD_INFO.PIN1, T_LTE_CARD_INFO.PIN2, T_LTE_CARD_INFO.PUK1,
T_LTE_CARD_INFO.PUK2, T_LTE_CARD_INFO.KI, T_LTE_CARD_INFO.EKI,
T_LTE_CARD_INFO.STATUS FROM T_LTE_CARD_INFO SAMPLE ( 5 ), T_HLR_MSISDN WHERE
T_HLR_MSISDN.HLR_PK = 'HLR12' AND T_LTE_CARD_INFO.SUB_IMSI = '46002' AND
T_LTE_CARD_INFO.MSISDN = T_HLR_MSISDN.PK AND ROWNUM < = 5
Plan hash value : 1908090178
PLAN_TABLE_OUTPUT
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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
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| 0 | SELECT STATEMENT | | | | 8 ( 100 )| |
| * 1 | COUNT STOPKEY | | | | | |
| 2 | TABLE ACCESS BY INDEX ROWID | T_LTE_CARD_INFO | 6 | 1308 | 6 ( 0 )| 00:00: 01 |
| 3 | NESTED LOOPS | | 6 | 1542 | 8 ( 0 )| 00:00: 01 |
| 4 | TABLE ACCESS BY INDEX ROWID| T_HLR_MSISDN | 38 | 1482 | 2 ( 0 )| 00:00: 01 |
| * 5 | INDEX RANGE SCAN | IND_HLR_PK | | | 1 ( 0 )| 00:00: 01 |
| * 6 | INDEX RANGE SCAN | IND_MS_SU | 6 | | 5 ( 0 )| 00:00: 01 |
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PLAN_TABLE_OUTPUT
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Predicate Information (identified by operation id):
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1 - filter(ROWNUM < = 5 )
5 - access ( "T_HLR_MSISDN" . "HLR_PK" = 'HLR12' )
6 - access ( "T_LTE_CARD_INFO" . "MSISDN" = "T_HLR_MSISDN" . "PK" AND
"T_LTE_CARD_INFO" . "SUB_IMSI" = '46002' )
filter(ORA_HASH(ROWID, 0 , 2038870484 , 'SYS_SAMPLE' , 0 ) < 214748365 )
32 rows selected.
- - - - 查看執行計劃中的 獲取a - rows 信息 E ROWS 預估的行數 - - - - -
- - - - 須要 alter session set statistics_level = all 或 / * + gather_plan_statistics * /
SQL > select * from table (dbms_xplan.display_cursor( null , null , 'ALLSTATS LAST' ));
SQL > select * from table (dbms_xplan.display_cursor( null , null , 'ADVANCED' ));
SQL > select * from table (dbms_xplan.display_cursor( null , null , 'ADVANCED ALLSTATS LAST PEEKED_BINDS' ));
PLAN_TABLE_OUTPUT
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SQL_ID b4vp4vx8q5jny, child number 1
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SELECT T_LTE_CARD_INFO.PK, T_LTE_CARD_INFO.IMSI, T_LTE_CARD_INFO.ICCID,
T_LTE_CARD_INFO.PIN1, T_LTE_CARD_INFO.PIN2, T_LTE_CARD_INFO.PUK1,
T_LTE_CARD_INFO.PUK2, T_LTE_CARD_INFO.KI, T_LTE_CARD_INFO.EKI,
T_LTE_CARD_INFO.STATUS FROM T_LTE_CARD_INFO SAMPLE ( 5 ), T_HLR_MSISDN WHERE
T_HLR_MSISDN.HLR_PK = 'HLR12' AND T_LTE_CARD_INFO.SUB_IMSI = '46002' AND
T_LTE_CARD_INFO.MSISDN = T_HLR_MSISDN.PK AND ROWNUM < = 5
Plan hash value : 1908090178
PLAN_TABLE_OUTPUT
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| Id | Operation | Name | Starts | E - Rows | A - Rows | A - Time | Buffers |
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| * 1 | COUNT STOPKEY | | 1 | | 5 |00:00:00. 01 | 19 |
| 2 | TABLE ACCESS BY INDEX ROWID | T_LTE_CARD_INFO | 1 | 6 | 5 |00:00:00. 01 | 19 |
| 3 | NESTED LOOPS | | 1 | 6 | 8 |00:00:00. 01 | 15 |
| 4 | TABLE ACCESS BY INDEX ROWID| T_HLR_MSISDN | 1 | 38 | 3 |00:00:00. 01 | 3 |
| * 5 | INDEX RANGE SCAN | IND_HLR_PK | 1 | | 3 |00:00:00. 01 | 2 |
| * 6 | INDEX RANGE SCAN | IND_MS_SU | 3 | 6 | 5 |00:00:00. 01 | 12 |
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PLAN_TABLE_OUTPUT
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Predicate Information (identified by operation id):
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1 - filter(ROWNUM < = 5 )
5 - access ( "T_HLR_MSISDN" . "HLR_PK" = 'HLR12' )
6 - access ( "T_LTE_CARD_INFO" . "MSISDN" = "T_HLR_MSISDN" . "PK" AND
"T_LTE_CARD_INFO" . "SUB_IMSI" = '46002' )
filter(ORA_HASH(ROWID, 0 , 1153052846 , 'SYS_SAMPLE' , 0 ) < 214748365 )
31 rows selected.
- - #####################################################
- - #### 綁定變量對執行計劃的影響 「綁定變量窺探」 ####
- - #####################################################
SQL > CREATE TABLE t1 AS SELECT * FROM DBA_OBJECTS ;
SQL > create index idx_t1 on t1 (object_id);
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-
-
收集統計信息
BEGIN
sys.DBMS_STATS.gather_table_stats (
ownname => 'CQWR',
tabname => 'T1',
estimate_percent => NULL,
method_opt => 'for all indexed columns size auto',
cascade => TRUE);
END;
- - 先來看不執行綁定變量時候的執行計劃
SQL > set wrap off
SQL > select count(*) from t1 where object_id between 999 and 1000;
COUNT ( * )
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2
SQL > select count(*) from t1 where object_id between 0 and 50000;
COUNT ( * )
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47490
SQL > select * from table(dbms_xplan.display_cursor);
PLAN_TABLE_OUTPUT
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SQL_ID 3qwssaf8f9kgt , child number 0
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select count ( * ) from t1 where object_id between 0 and 50000
Plan hash value : 2101382132
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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
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| 0 | SELECT STATEMENT | | | | 27 ( 100 )| |
| 1 | SORT AGGREGATE | | 1 | 5 | | |
PLAN_TABLE_OUTPUT
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| * 2 | INDEX FAST FULL SCAN| IDX_T1 | 46783 | 228K | 27 ( 4 )| 00:00: 01 |
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Predicate Information (identified by operation id):
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2 - filter(( "OBJECT_ID" < = 50000 AND "OBJECT_ID" > = 0 ))
19 rows selected.
和咱們預期的一致 INDEX RANGE SCAN 和 INDEX FAST FULL SCAN
咱們使用綁定變量的方式來執行 SQL
select * from table (dbms_xplan.display_cursor( 2621316314 , 0 , 'ADVANCED' ));
- - 傳入SQL_ID
- - - 爲了獲取緩存庫中的執行計劃，能夠直接查詢動態性能視圖v$sql_plan和v$sql_plan_statistics_all等，但更方便的方法是：
select t. * from v$ sql s, table (dbms_xplan.display_cursor(s.sql_id,s.child_number, 'allstats last' )) t where s.sql_id = '0jq118yf3w76u' ;
- - - 當前查看的方式以下
SQL > select * from table (dbms_xplan.display_cursor);
PLAN_TABLE_OUTPUT
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
SQL_ID b4vp4vx8q5jny, child number 0
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SELECT T_LTE_CARD_INFO.PK, T_LTE_CARD_INFO.IMSI, T_LTE_CARD_INFO.ICCID,
T_LTE_CARD_INFO.PIN1, T_LTE_CARD_INFO.PIN2, T_LTE_CARD_INFO.PUK1,
T_LTE_CARD_INFO.PUK2, T_LTE_CARD_INFO.KI, T_LTE_CARD_INFO.EKI,
T_LTE_CARD_INFO.STATUS FROM T_LTE_CARD_INFO SAMPLE ( 5 ), T_HLR_MSISDN WHERE
T_HLR_MSISDN.HLR_PK = 'HLR12' AND T_LTE_CARD_INFO.SUB_IMSI = '46002' AND
T_LTE_CARD_INFO.MSISDN = T_HLR_MSISDN.PK AND ROWNUM < = 5
Plan hash value : 1908090178
PLAN_TABLE_OUTPUT
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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
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| 0 | SELECT STATEMENT | | | | 8 ( 100 )| |
| * 1 | COUNT STOPKEY | | | | | |
| 2 | TABLE ACCESS BY INDEX ROWID | T_LTE_CARD_INFO | 6 | 1308 | 6 ( 0 )| 00:00: 01 |
| 3 | NESTED LOOPS | | 6 | 1542 | 8 ( 0 )| 00:00: 01 |
| 4 | TABLE ACCESS BY INDEX ROWID| T_HLR_MSISDN | 38 | 1482 | 2 ( 0 )| 00:00: 01 |
| * 5 | INDEX RANGE SCAN | IND_HLR_PK | | | 1 ( 0 )| 00:00: 01 |
| * 6 | INDEX RANGE SCAN | IND_MS_SU | 6 | | 5 ( 0 )| 00:00: 01 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
PLAN_TABLE_OUTPUT
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Predicate Information (identified by operation id):
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1 - filter(ROWNUM < = 5 )
5 - access ( "T_HLR_MSISDN" . "HLR_PK" = 'HLR12' )
6 - access ( "T_LTE_CARD_INFO" . "MSISDN" = "T_HLR_MSISDN" . "PK" AND
"T_LTE_CARD_INFO" . "SUB_IMSI" = '46002' )
filter(ORA_HASH(ROWID, 0 , 2038870484 , 'SYS_SAMPLE' , 0 ) < 214748365 )
32 rows selected.
- - - - 查看執行計劃中的 獲取a - rows 信息 E ROWS 預估的行數 - - - - -
- - - - 須要 alter session set statistics_level = all 或 / * + gather_plan_statistics * /
SQL > select * from table (dbms_xplan.display_cursor( null , null , 'ALLSTATS LAST' ));
SQL > select * from table (dbms_xplan.display_cursor( null , null , 'ADVANCED' ));
SQL > select * from table (dbms_xplan.display_cursor( null , null , 'ADVANCED ALLSTATS LAST PEEKED_BINDS' ));
PLAN_TABLE_OUTPUT
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SQL_ID b4vp4vx8q5jny, child number 1
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SELECT T_LTE_CARD_INFO.PK, T_LTE_CARD_INFO.IMSI, T_LTE_CARD_INFO.ICCID,
T_LTE_CARD_INFO.PIN1, T_LTE_CARD_INFO.PIN2, T_LTE_CARD_INFO.PUK1,
T_LTE_CARD_INFO.PUK2, T_LTE_CARD_INFO.KI, T_LTE_CARD_INFO.EKI,
T_LTE_CARD_INFO.STATUS FROM T_LTE_CARD_INFO SAMPLE ( 5 ), T_HLR_MSISDN WHERE
T_HLR_MSISDN.HLR_PK = 'HLR12' AND T_LTE_CARD_INFO.SUB_IMSI = '46002' AND
T_LTE_CARD_INFO.MSISDN = T_HLR_MSISDN.PK AND ROWNUM < = 5
Plan hash value : 1908090178
PLAN_TABLE_OUTPUT
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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| Id | Operation | Name | Starts | E - Rows | A - Rows | A - Time | Buffers |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| * 1 | COUNT STOPKEY | | 1 | | 5 |00:00:00. 01 | 19 |
| 2 | TABLE ACCESS BY INDEX ROWID | T_LTE_CARD_INFO | 1 | 6 | 5 |00:00:00. 01 | 19 |
| 3 | NESTED LOOPS | | 1 | 6 | 8 |00:00:00. 01 | 15 |
| 4 | TABLE ACCESS BY INDEX ROWID| T_HLR_MSISDN | 1 | 38 | 3 |00:00:00. 01 | 3 |
| * 5 | INDEX RANGE SCAN | IND_HLR_PK | 1 | | 3 |00:00:00. 01 | 2 |
| * 6 | INDEX RANGE SCAN | IND_MS_SU | 3 | 6 | 5 |00:00:00. 01 | 12 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
PLAN_TABLE_OUTPUT
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Predicate Information (identified by operation id):
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1 - filter(ROWNUM < = 5 )
5 - access ( "T_HLR_MSISDN" . "HLR_PK" = 'HLR12' )
6 - access ( "T_LTE_CARD_INFO" . "MSISDN" = "T_HLR_MSISDN" . "PK" AND
"T_LTE_CARD_INFO" . "SUB_IMSI" = '46002' )
filter(ORA_HASH(ROWID, 0 , 1153052846 , 'SYS_SAMPLE' , 0 ) < 214748365 )
31 rows selected.
- - #####################################################
- - #### 綁定變量對執行計劃的影響 「綁定變量窺探」 ####
- - #####################################################
SQL > CREATE TABLE t1 AS SELECT * FROM DBA_OBJECTS ;
SQL > create index idx_t1 on t1 (object_id);
SQL> select count(*) from t1;
COUNT(*)
----------
74789
SQL> select count(distinct(object_id)) from t1;
COUNT(DISTINCT(OBJECT_ID))
--------------------------
74789
BEGIN
sys.DBMS_STATS.gather_table_stats (
ownname => 'CQWR',
tabname => 'T1',
estimate_percent => NULL,
method_opt => 'for all indexed columns size auto',
cascade => TRUE);
END;
- - 先來看不執行綁定變量時候的執行計劃
SQL > set wrap off
SQL > select count(*) from t1 where object_id between 999 and 1000;
COUNT ( * )
- - - - - - - - - -
2
SQL> select * from table(dbms_xplan.display_cursor);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID arym7r4js4gy2, child number 0
-------------------------------------
select count(*) from t1 where object_id between 999 and 1000
Plan hash value: 1970818898
----------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
----------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 2 (100)| |
| 1 | SORT AGGREGATE | | 1 | 5 | | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
|* 2 | INDEX RANGE SCAN| IDX_T1 | 3 | 15 | 2 (0)| 00:00:01 |
----------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("OBJECT_ID">=999 AND "OBJECT_ID"<=1000)
19 rows selected.
SQL>
SQL > select count(*) from t1 where object_id between 0 and 50000;
COUNT ( * )
- - - - - - - - - -
47490
SQL > select * from table(dbms_xplan.display_cursor);
PLAN_TABLE_OUTPUT
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
SQL_ID 3qwssaf8f9kgt , child number 0
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
select count ( * ) from t1 where object_id between 0 and 50000
Plan hash value : 2101382132
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 0 | SELECT STATEMENT | | | | 27 ( 100 )| |
| 1 | SORT AGGREGATE | | 1 | 5 | | |
PLAN_TABLE_OUTPUT
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| * 2 | INDEX FAST FULL SCAN| IDX_T1 | 46783 | 228K | 27 ( 4 )| 00:00: 01 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Predicate Information (identified by operation id):
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2 - filter(( "OBJECT_ID" < = 50000 AND "OBJECT_ID" > = 0 ))
19 rows selected.
和咱們預期的一致 INDEX RANGE SCAN 和 INDEX FAST FULL SCAN
咱們使用綁定變量的方式來執行 SQL
SQL
>
var x
number
SQL > var y number
SQL > exec :x :=99
PL / SQL procedure successfully completed.
SQL > exec :y :=100
PL / SQL procedure successfully completed.
SQL > var y number
SQL > exec :x :=99
PL / SQL procedure successfully completed.
SQL > exec :y :=100
PL / SQL procedure successfully completed.
SQL > select count(*) from t1 where object_id between :x and :y ;
COUNT ( * )
- - - - - - - - - -
2
SQL>alter session set statistics_level=all ;
SQL> select * from table(dbms_xplan.display_cursor(null,null,'ADVANCED ALLSTATS LAST PEEKED_BINDS'));
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID 7pz1dg089j86a, child number 1
-------------------------------------
select count(*) from t1 where object_id between :x and :y
Plan hash value: 2351893609
--------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| E-T
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | | 2 (100)|
| 1 | SORT AGGREGATE | | 1 | 1 | 5 | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
|* 2 | FILTER | | 1 | | | |
|* 3 | INDEX RANGE SCAN| IDX_T1 | 1 | 3 | 15 | 2 (0)| 00:
--------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1
3 - SEL$1 / T1@SEL$1
Outline Data
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
-------------
/*+
BEGIN_OUTLINE_DATA
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE('11.2.0.3')
DB_VERSION('11.2.0.3')
ALL_ROWS
OUTLINE_LEAF(@"SEL$1")
INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."OBJECT_ID"))
END_OUTLINE_DATA
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
*/
Peeked Binds (identified by position):
--------------------------------------
1 - (NUMBER): 99
2 - (NUMBER): 100
Predicate Information (identified by operation id):
---------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
2 - filter(:X<=:Y)
3 - access("OBJECT_ID">=:X AND "OBJECT_ID"<=:Y)
Column Projection Information (identified by operation id):
-----------------------------------------------------------
1 - (#keys=0) COUNT(*)[22]
52 rows selected.
--從新綁定變量 爲0 --- 50000
SQL
>
exec :x :=0
PL / SQL procedure successfully completed.
SQL > exec :y :=50000
PL / SQL procedure successfully completed.
SQL > select count(*) from t1 where object_id between :x and :y ;
COUNT ( * )
- - - - - - - - - -
47490
SQL> select * from table(dbms_xplan.display_cursor(null,null,'ADVANCED ALLSTATS LAST PEEKED_BINDS'));
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID 7pz1dg089j86a, child number 1
-------------------------------------
select count(*) from t1 where object_id between :x and :y
Plan hash value: 2351893609
--------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| E-T
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | | 2 (100)|
| 1 | SORT AGGREGATE | | 1 | 1 | 5 | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
|* 2 | FILTER | | 1 | | | |
|* 3 | INDEX RANGE SCAN| IDX_T1 | 1 | 3 | 15 | 2 (0)| 00:
--------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1
3 - SEL$1 / T1@SEL$1
Outline Data
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
-------------
/*+
BEGIN_OUTLINE_DATA
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE('11.2.0.3')
DB_VERSION('11.2.0.3')
ALL_ROWS
OUTLINE_LEAF(@"SEL$1")
INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."OBJECT_ID"))
END_OUTLINE_DATA
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
*/
Peeked Binds (identified by position):
--------------------------------------
1 - (NUMBER): 99
2 - (NUMBER): 100
Predicate Information (identified by operation id):
---------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
2 - filter(:X<=:Y)
3 - access("OBJECT_ID">=:X AND "OBJECT_ID"<=:Y)
Column Projection Information (identified by operation id):
-----------------------------------------------------------
1 - (#keys=0) COUNT(*)[22]
52 rows selected.
由於 Peeked Binds的值仍是 99 到100
也就是oracle在處理有綁定變量的時候只有在硬解析的時候纔去窺探一下該SQL的綁定變量。
咱們能夠經過一些可有可無的DDL語句來實現硬解析。
SQL > ALTER SYSTEM FLUSH SHARED_POOL ;
SQL > select count ( * ) from t1 where object_id between :x and :y ;
COUNT ( * )
- - - - - - - - - -
47490
在更換一個值 結果又會走INDEX FAST FULL SCAN 如下就略
SQL > exec :x : = 0
PL / SQL procedure successfully completed.
SQL > exec :y : = 5
能夠設置這個參數來跳過 可是這個事內部參數 仍是不穩定會有 BUG: 4567767 Peeked Binds 仍是會發生
alter system set "_optim_peek_user_binds" = true scope = spfile ;
也就是oracle在處理有綁定變量的時候只有在硬解析的時候纔去窺探一下該SQL的綁定變量。
咱們能夠經過一些可有可無的DDL語句來實現硬解析。
SQL > ALTER SYSTEM FLUSH SHARED_POOL ;
SQL > select count ( * ) from t1 where object_id between :x and :y ;
COUNT ( * )
- - - - - - - - - -
47490
SQL> select * from table(dbms_xplan.display_cursor(null,null,'ADVANCED ALLSTATS LAST PEEKED_BINDS'));
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID 7pz1dg089j86a, child number 0
-------------------------------------
select count(*) from t1 where object_id between :x and :y
Plan hash value: 1410530761
--------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)|
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | | 48 (100)|
| 1 | SORT AGGREGATE | | 1 | 1 | 5 | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
|* 2 | FILTER | | 1 | | | |
|* 3 | INDEX FAST FULL SCAN| IDX_T1 | 1 | 48267 | 235K| 48 (3)|
--------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1
3 - SEL$1 / T1@SEL$1
Outline Data
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
-------------
/*+
BEGIN_OUTLINE_DATA
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE('11.2.0.3')
DB_VERSION('11.2.0.3')
ALL_ROWS
OUTLINE_LEAF(@"SEL$1")
INDEX_FFS(@"SEL$1" "T1"@"SEL$1" ("T1"."OBJECT_ID"))
END_OUTLINE_DATA
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
*/
Peeked Binds (identified by position):
--------------------------------------
1 - (NUMBER): 0
2 - (NUMBER): 50000
Predicate Information (identified by operation id):
---------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
2 - filter(:X<=:Y)
3 - filter(("OBJECT_ID"<=:Y AND "OBJECT_ID">=:X))
Column Projection Information (identified by operation id):
-----------------------------------------------------------
1 - (#keys=0) COUNT(*)[22]
52 rows selected.
SQL>
在更換一個值 結果又會走INDEX FAST FULL SCAN 如下就略
SQL > exec :x : = 0
PL / SQL procedure successfully completed.
SQL > exec :y : = 5
能夠設置這個參數來跳過 可是這個事內部參數 仍是不穩定會有 BUG: 4567767 Peeked Binds 仍是會發生
alter system set "_optim_peek_user_binds" = true scope = spfile ;
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