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Oracle 11g new NOT null field is faster than 10g-new feature

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Author: User
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Adding a NOT null field before 11g is very slow, very fast after 11g, let's do a test first and then explore the principle.

Sql> select * from V$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-64bi
PL/SQL Release 10.2.0.1.0-production
CORE 10.2.0.1.0 Production
TNS for 64-bit windows:version 10.2.0.1.0-production
Nlsrtl Version 10.2.0.1.0-production

sql> drop table test purge;
Sql> CREATE TABLE Test as SELECT * from Dba_objects;
Sql> Select COUNT (*) from test;
COUNT (*)
----------
151203
Sql> Set Timing on
Sql> ALTER TABLE test add col1 char () DEFAULT ' LARGE COLUMN ' not null;
time used: 00:00:09.48

Sql> SELECT SUM (BYTES)/1024/1024 | | ' M ' from user_segments WHERE segment_name = ' TEST ';
SUM (BYTES)/1024/1024| | ' M
-----------------------------------------
200M

Under 11g:
Sql> select * from V$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-64bit Production
PL/SQL Release 11.2.0.1.0-production
CORE 11.2.0.1.0 Production
TNS for Linux:version 11.2.0.1.0-production
Nlsrtl Version 11.2.0.1.0-production
sql> drop table test purge;
Sql> CREATE TABLE Test as SELECT * from Dba_objects;
sql> INSERT INTO Test select * from Dba_objects;
Sql> commit;
Sql> Select COUNT (*) from test;
COUNT (*)
----------
149012
Sql> Set Timing on
Sql> ALTER TABLE test add col1 char () DEFAULT ' LARGE COLUMN ' not null;

Time used: 00:00:00.07


sql> SELECT SUM (BYTES)/1024/1024 | | ' M ' from user_segments WHERE segment_name = ' TEST ';
SUM (BYTES)/1024/1024| | ' M
-----------------------------------------

18M


Explore the principle: Dump block can be found, in the 10g generated a lot of row migration and row links. And in the 11g is a value, in the official document that Oracle by recording the default value in the data dictionary, avoids the heavy update operation.

in theDump block to see:
Alter session Set Tracefile_identifier = ' gg_test ';
Select rowID,
Dbms_rowid.rowid_object (ROWID) object_id,
DBMS_ROWID.ROWID_RELATIVE_FNO (ROWID) file_id,
Dbms_rowid.rowid_block_number (ROWID) block_id,
Dbms_rowid.rowid_row_number (ROWID) num
From Test where rownum <5;
Alter system dump DATAFILE 5 block 1465683;

10g under:
Tl:9 FB:--h-----lb:0x2 cc:0
Nrid:0x0181e36b.1
tab 0, row 2, @0x1b3a
tl:1076 FB:--h-fl--lb:0x2 cc:14
Col 0: [3] 53 59 53
Col 1: [4] 4f 4e 24
Col 2: *null*
Col 3: [2] C1 1d
Col 4: [2] C1 1d
Col 5: [5] 4c 45
Col 6: [7] 1e 0e 33 19
Col 7: [7] 1e 0f 31 37
Col 8: [+] + 2d 2d (3a) 3a 32 34
Col 9: [5] 4c 49 44
Col: [1] 4e
Col: [1] 4e
Col: [1] 4e
Col 13: [1000]
4c 4f 4c 4d 4e 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
tab 0, row 3, @0x1b31
Tl:9 FB:--h-----lb:0x2 cc:0
nrid:0x0181e36b.2--nrid Row Migration
tab 0, row 4, @0x1b28
Tl:9 FB:--h-----lb:0x2 cc:0
Nrid:0x0181e36b.3

11g under:
tab 0, row 0, @0x3f33
tl:77 FB:--h-fl--lb:0x0 cc:14
Col 0: [3] 53 59 53
Col 1: [5] 4f 4c 24
Col 2: *null*
Col 3: [2] C1 15
Col 4: [2] C1 03
Col 5: [5] 4c 45
Col 6: [7] 0c 1a 2f
Col 7: [7] 0c 26 33
Col 8: [+] 2d, 2d, 3a, 3a, 3a 34 36
Col 9: [5] 4c 49 44
Col: [1] 4e
Col: [1] 4e
Col: [1] 4e
Col: [2] C1 02
tab 0, row 1, @0x3ee4
tl:79 FB:--h-fl--lb:0x0 cc:14
Col 0: [3] 53 59 53
Col 1: [7] 5f 55 53 45 52 31
Col 2: *null*
Col 3: [2] C1 2f
Col 4: [2] C1 2f
Col 5: [5] 4e 44 45 58
Col 6: [7] 0c 1a 2f
Col 7: [7] 0c 1a 2f
Col 8: [+] 2d, 2d, 3a, 3a, 3a 34 36
Col 9: [5] 4c 49 44
Col: [1] 4e
Col: [1] 4e
Col: [1] 4e
Col: [2] C1 05

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Related Keywords:
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