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merge.lst
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SQL>
SQL> alter session enable parallel dml;
Session altered.
SQL> alter session set parallel_force_local = FALSE;
Session altered.
SQL> alter session set parallel_degree_policy = 'MANUAL';
Session altered.
SQL>
SQL> DROP TABLE sales_dl;
Table dropped.
SQL> DROP TABLE sales_dl_copy;
Table dropped.
SQL>
SQL> CREATE TABLE sales_dl (sale_id NUMBER(10), customer_id NUMBER(10), counter NUMBER(10));
Table created.
SQL>
SQL> BEGIN
2 INSERT INTO sales_dl
3 SELECT ROWNUM, MOD(ROWNUM,1000),ROWNUM*2
4 FROM dual
5 CONNECT BY LEVEL <= 1000000;
6 COMMIT;
7 END;
8 /
PL/SQL procedure successfully completed.
SQL>
SQL> EXEC dbms_stats.gather_table_stats(ownname=>NULL, tabname=>'SALES_DL');
PL/SQL procedure successfully completed.
SQL>
SQL> alter session enable parallel dml;
Session altered.
SQL> alter session set parallel_force_local = FALSE;
Session altered.
SQL> alter session set parallel_degree_policy = 'MANUAL';
Session altered.
SQL>
SQL> CREATE TABLE sales_dl_copy
2 AS
3 SELECT * FROM sales_dl;
Table created.
SQL>
SQL> EXEC dbms_stats.gather_table_stats(ownname=>NULL, tabname=>'SALES_DL_COPY');
PL/SQL procedure successfully completed.
SQL>
SQL> alter table sales_dl parallel 4;
Table altered.
SQL> alter table sales_dl_copy parallel 4;
Table altered.
SQL>
SQL> select segment_type,extent_id,bytes,blocks
2 from user_extents
3 where segment_name ='SALES_DL_COPY'
4 order by extent_id;
SEGMENT_TYPE EXTENT_ID BYTES BLOCKS
------------------ ---------- ---------- ----------
TABLE 0 65536 8
TABLE 1 65536 8
TABLE 2 65536 8
TABLE 3 65536 8
TABLE 4 65536 8
TABLE 5 65536 8
TABLE 6 65536 8
TABLE 7 65536 8
TABLE 8 65536 8
TABLE 9 65536 8
TABLE 10 65536 8
TABLE 11 65536 8
TABLE 12 65536 8
TABLE 13 65536 8
TABLE 14 65536 8
TABLE 15 65536 8
TABLE 16 1048576 128
TABLE 17 1048576 128
TABLE 18 1048576 128
TABLE 19 1048576 128
TABLE 20 1048576 128
TABLE 21 1048576 128
TABLE 22 1048576 128
TABLE 23 1048576 128
TABLE 24 1048576 128
TABLE 25 1048576 128
TABLE 26 1048576 128
TABLE 27 1048576 128
TABLE 28 1048576 128
TABLE 29 1048576 128
TABLE 30 1048576 128
TABLE 31 1048576 128
TABLE 32 1048576 128
TABLE 33 1048576 128
TABLE 34 1048576 128
TABLE 35 1048576 128
TABLE 36 1048576 128
37 rows selected.
SQL>
SQL> MERGE INTO sales_dl_copy sdlc USING (
2 SELECT sale_id, customer_id
3 FROM sales_dl WHERE sale_id < 10000
4 ) sdl
5 ON (sdlc.sale_id = sdl.sale_id - 5000)
6 WHEN MATCHED THEN
7 UPDATE SET sdlc.counter = - sdlc.counter
8 WHEN NOT MATCHED THEN
9 INSERT /*+ APPEND */ (sale_id,customer_id)
10 VALUES (sdl.sale_id-5000,sdl.customer_id)
11 ;
9999 rows merged.
SQL>
SQL> select * from table(dbms_xplan.display_cursor);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID 9nttxsqsj9sxa, child number 0
-------------------------------------
MERGE INTO sales_dl_copy sdlc USING ( SELECT sale_id, customer_id FROM
sales_dl WHERE sale_id < 10000 ) sdl ON (sdlc.sale_id = sdl.sale_id -
5000) WHEN MATCHED THEN UPDATE SET sdlc.counter = -
sdlc.counter WHEN NOT MATCHED THEN INSERT /*+ APPEND */
(sale_id,customer_id) VALUES (sdl.sale_id-5000,sdl.customer_id)
Plan hash value: 581223539
------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
------------------------------------------------------------------------------------------------------------------------------
| 0 | MERGE STATEMENT | | | | 418 (100)| | | | |
| 1 | PX COORDINATOR | | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10003 | 9999 | 224K| 418 (1)| 00:00:01 | Q1,03 | P->S | QC (RAND) |
| 3 | MERGE | SALES_DL_COPY | | | | | Q1,03 | PCWP | |
| 4 | PX RECEIVE | | 9999 | 224K| 418 (1)| 00:00:01 | Q1,03 | PCWP | |
| 5 | PX SEND HYBRID (ROWID PKEY)| :TQ10002 | 9999 | 224K| 418 (1)| 00:00:01 | Q1,02 | P->P | HYBRID (ROW|
| 6 | VIEW | | | | | | Q1,02 | PCWP | |
|* 7 | HASH JOIN OUTER BUFFERED | | 9999 | 224K| 418 (1)| 00:00:01 | Q1,02 | PCWP | |
| 8 | PX RECEIVE | | 9999 | 89991 | 210 (1)| 00:00:01 | Q1,02 | PCWP | |
| 9 | PX SEND HASH | :TQ10000 | 9999 | 89991 | 210 (1)| 00:00:01 | Q1,00 | P->P | HASH |
| 10 | PX BLOCK ITERATOR | | 9999 | 89991 | 210 (1)| 00:00:01 | Q1,00 | PCWC | |
|* 11 | TABLE ACCESS FULL | SALES_DL | 9999 | 89991 | 210 (1)| 00:00:01 | Q1,00 | PCWP | |
| 12 | PX RECEIVE | | 1000K| 13M| 207 (1)| 00:00:01 | Q1,02 | PCWP | |
| 13 | PX SEND HASH | :TQ10001 | 1000K| 13M| 207 (1)| 00:00:01 | Q1,01 | P->P | HASH |
| 14 | PX BLOCK ITERATOR | | 1000K| 13M| 207 (1)| 00:00:01 | Q1,01 | PCWC | |
|* 15 | TABLE ACCESS FULL | SALES_DL_COPY | 1000K| 13M| 207 (1)| 00:00:01 | Q1,01 | PCWP | |
------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
7 - access("SDLC"."SALE_ID"="SALE_ID"-5000)
11 - access(:Z>=:Z AND :Z<=:Z)
filter("SALE_ID"<10000)
15 - access(:Z>=:Z AND :Z<=:Z)
39 rows selected.
SQL>
SQL> commit;
Commit complete.
SQL>
SQL> --
SQL> -- Here are the extents for SALES_DL_COPY after
SQL> -- the MERGE operation
SQL> -- Compare the 11g and 12c case.
SQL> --
SQL> -- Your exact results will depend on:
SQL> -- DB block size (8K in my case)
SQL> -- Tablespace storage defaults (I am using default USERS tablespace)
SQL> --
SQL> -- The number of extents in the 12c case will
SQL> -- also depend on the number of active RAC instances.
SQL> -- In my case it is two.
SQL> --
SQL> -- Expect fewer extents in the 12c case than the 11g case.
SQL> --
SQL>
SQL> select segment_type,extent_id,bytes,blocks
2 from user_extents
3 where segment_name ='SALES_DL_COPY'
4 order by extent_id;
SEGMENT_TYPE EXTENT_ID BYTES BLOCKS
------------------ ---------- ---------- ----------
TABLE 0 65536 8
TABLE 1 65536 8
TABLE 2 65536 8
TABLE 3 65536 8
TABLE 4 65536 8
TABLE 5 65536 8
TABLE 6 65536 8
TABLE 7 65536 8
TABLE 8 65536 8
TABLE 9 65536 8
TABLE 10 65536 8
TABLE 11 65536 8
TABLE 12 65536 8
TABLE 13 65536 8
TABLE 14 65536 8
TABLE 15 65536 8
TABLE 16 1048576 128
TABLE 17 1048576 128
TABLE 18 1048576 128
TABLE 19 1048576 128
TABLE 20 1048576 128
TABLE 21 1048576 128
TABLE 22 1048576 128
TABLE 23 1048576 128
TABLE 24 1048576 128
TABLE 25 1048576 128
TABLE 26 1048576 128
TABLE 27 1048576 128
TABLE 28 1048576 128
TABLE 29 1048576 128
TABLE 30 1048576 128
TABLE 31 1048576 128
TABLE 32 1048576 128
TABLE 33 1048576 128
TABLE 34 1048576 128
TABLE 35 1048576 128
TABLE 36 393216 48
TABLE 37 131072 16
TABLE 38 131072 16
TABLE 39 131072 16
TABLE 40 131072 16
41 rows selected.
SQL>
SQL> exit
