Insert 語句對 nologging 與 logging表在不同場景下的優化

本文轉載自查看原文 2018-04-23 17:45 1674 Oracle sql優化

前言

前段時間報表數據庫上有條insert sql語句，插入的大量數據，執行非常慢，需要對其進行分析優化。

分析步驟是在：ARCHIVE與NOARCHIVE模式下進行。

測試場景: 分別對表的常規插入，表在append插入，表在append + parallel插入進行性能測試，得出結果。

環境准備

數據庫版本	基礎表	nologging表	logging表
Oracle 11g	T1	T2	T3

#創建T1,T2,T3表
create table t1 as select * from dba_objects;
create table t2 as select * from dba_objects where 1=2;
create table t3 as select * from dba_objects where 1=2;

#往T1表插入數據
SQL> insert into t1 select * from t1;

72813 rows created.

SQL> /

145626 rows created.

SQL> /

291252 rows created.

SQL> select count(*) from t1; COUNT(*)
----------
    582504

#設置T2表為nologging屬性
SQL> alter table t2 nologging;

Table altered.

數據庫處於ARCHIVE時

常規插入

nologging 表T2

SQL> insert into t2 select * from t1; 
commit;
582824 rows created.
Execution Plan ----------------------------------------------------------
Plan hash value: 3617692013

--------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------
|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |
|   1 |  LOAD TABLE CONVENTIONAL | T2   |   |   |        |      |
| 2 | TABLE ACCESS FULL | T1 | 582K| 53M| 1455 (2)| 00:00:18 | ---------------------------------------------------------------------------------


Statistics ----------------------------------------------------------
 3345 recursive calls
 46879 db block gets
 27878 consistent gets
 8269 physical reads
 67752144 redo size
 838 bytes sent via SQL*Net to client
 784 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 3 sorts (memory)
 0 sorts (disk)
 582824 rows processed

SQL> 
Commit complete.

耗費：67752144 redo size

logging 表T3

SQL> insert into t3 select * from t1; 
commit;
582824 rows created.
Execution Plan ----------------------------------------------------------
Plan hash value: 3617692013

--------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------
|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |
|   1 |  LOAD TABLE CONVENTIONAL | T3   |   |   |        |      |
| 2 | TABLE ACCESS FULL | T1 | 582K| 53M| 1455 (2)| 00:00:18 | ---------------------------------------------------------------------------------


Statistics ----------------------------------------------------------
 2860 recursive calls
 46875 db block gets
 27811 consistent gets
 1 physical reads
 67875992 redo size
 829 bytes sent via SQL*Net to client
 784 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

SQL> 
Commit complete.

耗費：67875992 redo size

append 插入

nologging 表T2

SQL> insert /*+ append */  into t2 select * from t1; 
commit;
582824 rows created.


Execution Plan ----------------------------------------------------------

ERROR:
ORA-12838: cannot read/modify an object after modifying it in parallel


SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics ----------------------------------------------------------
 2627 recursive calls
 9324 db block gets
 8832 consistent gets
 0 physical reads
 143436 redo size
 824 bytes sent via SQL*Net to client
 798 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：143436 redo size

logging 表T3

SQL> insert /*+ append */ into t3 select * from t1; 

582824 rows created.


Execution Plan ----------------------------------------------------------
ERROR:
ORA-12838: cannot read/modify an object after modifying it in parallel


SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics ----------------------------------------------------------
 2627 recursive calls
 9327 db block gets
 8832 consistent gets
 0 physical reads
 68384900 redo size
 822 bytes sent via SQL*Net to client
 797 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：68384900 redo size

parallel + append 插入

nologging 表T2

SQL> alter session enable parallel dml;
insert /*+ append parallel(2) */ into t2 select * from t1; 
commit;
Session altered.

SQL> 

582824 rows created.


Execution Plan ----------------------------------------------------------
ERROR:
ORA-12838: cannot read/modify an object after modifying it in parallel


SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics ----------------------------------------------------------
 52 recursive calls
 32 db block gets
 19 consistent gets
 0 physical reads
 21916 redo size
 824 bytes sent via SQL*Net to client
 809 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：21916 redo size

logging 表T3

SQL> alter session enable parallel dml;
insert /*+ append parallel(2)*/ into t3 select * from t1; 
commit;
Session altered.

SQL> 

582824 rows created.


Execution Plan ----------------------------------------------------------
ERROR:
ORA-12838: cannot read/modify an object after modifying it in parallel


SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics ----------------------------------------------------------
 50 recursive calls
 33 db block gets
 20 consistent gets
 0 physical reads
 21308 redo size
 824 bytes sent via SQL*Net to client
 808 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：21308 redo size

數據庫處於NOARCHIVE時

常規插入

nologging 表T2

Execution Plan ----------------------------------------------------------
Plan hash value: 3617692013

--------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------
|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |
|   1 |  LOAD TABLE CONVENTIONAL | T2   |   |   |        |      |
| 2 | TABLE ACCESS FULL | T1 | 582K| 53M| 1455 (2)| 00:00:18 | ---------------------------------------------------------------------------------


Statistics ----------------------------------------------------------
 2538 recursive calls
 46869 db block gets
 27796 consistent gets
 8266 physical reads
 67754744 redo size
 824 bytes sent via SQL*Net to client
 784 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：67754744 redo size

logging 表T3

Execution Plan ----------------------------------------------------------
Plan hash value: 3617692013

--------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------
|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |
|   1 |  LOAD TABLE CONVENTIONAL | T3   |   |   |        |      |
| 2 | TABLE ACCESS FULL | T1 | 582K| 53M| 1455 (2)| 00:00:18 | ---------------------------------------------------------------------------------


Statistics ----------------------------------------------------------
 2593 recursive calls
 46873 db block gets
 27800 consistent gets
 1600 physical reads
 67757328 redo size
 824 bytes sent via SQL*Net to client
 784 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 3 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：67757328 redo size

append 插入

nologging 表T2

Statistics ----------------------------------------------------------
 2627 recursive calls
 9324 db block gets
 8832 consistent gets
 2993 physical reads
 143480 redo size
 822 bytes sent via SQL*Net to client
 798 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：143480 redo size

logging 表T3

Statistics ----------------------------------------------------------
 2627 recursive calls
 9327 db block gets
 8832 consistent gets
 0 physical reads
 143420 redo size
 821 bytes sent via SQL*Net to client
 798 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：143420 redo size

parallel + append 插入

nologging 表T2

Statistics ----------------------------------------------------------
 50 recursive calls
 32 db block gets
 21 consistent gets
 0 physical reads
 21896 redo size
 823 bytes sent via SQL*Net to client
 810 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：21896 redo size

logging 表T3

Statistics ----------------------------------------------------------
 50 recursive calls
 33 db block gets
 20 consistent gets
 0 physical reads
 21896 redo size
 821 bytes sent via SQL*Net to client
 809 bytes received via SQL*Net from client
 3 SQL*Net roundtrips to/from client
 1 sorts (memory)
 0 sorts (disk)
 582824 rows processed

耗費：21896 redo size

綜合比較

屬性	表名	常規插入產生的redo size	apppend插入產生的redo size	apppend + parallel插入產生的redo size
數據庫模式	archive
nologing	t2	67752144	143436	21916
loging	t3	67875992	68384900	21308
數據庫模式	noarchive
nologing	t2	67754744	143480	21896
loging	t3	67757328	143420	21896

1）數據庫處於ARCHIVE模式時，對logging表執行append插入，是對性能沒有優化的。加並行parallel才會有影響。
2）數據庫處於NOARCHIVE模式時，對logging表執行append插入，可以有效的提升性能。當然加並行parallel效果會更好

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