[20190415]11g下那些latch是共用的.txthttp://andreynikolaev.wordpress.com/2010/11/23/shared-latches-by-oracle-version/--//oracle並沒有文檔準確說明那些latch是支持共用,作者的鏈接通過使用 ...
[20190415]11g下那些latch是共用的.txt
http://andreynikolaev.wordpress.com/2010/11/23/shared-latches-by-oracle-version/
--//oracle並沒有文檔準確說明那些latch是支持共用,作者的鏈接通過使用orderbug手工調用kslgetsl()函數(10g)或者kslgetsl_w()函
--//數(11g),確定那些latch支持共用模式.我僅僅重覆測試看看.
1.環境:
SYS@book> @ ver1
PORT_STRING VERSION BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
2.建立測試腳本:
--//drop table shared_latches purge;
create table shared_latches(
version varchar2(50), /* Oracle version */
latch# number, /* latch# */
name varchar2(200), /* ltach name */
shared varchar2(1) /* if 'Y' then latch is shared */
);
--//建立表shared_latches.
spool list_shared_latches.sh
select 'sqlplus /nolog @is_latch_shared 0x'||addr||' '||latch#||' "'||translate(name,'''',' ')||'"'
from v$latch_parent;
spool off
--//獲得latch list.僅僅測試latch parent就ok了.適當編輯整理腳本.
$ cat is_latch_shared.sql
/*
This file is part of demos for "Contemporary Latch Internals" seminar v.24.08.2010
Copyright: (c) Andrey S. Nikolaev ([email protected]) RDTEX
http://AndreyNikolaev.wordpress.com
for 32bit Oracle 10g and above
*/
connect / as sysdba
set verify off
WHENEVER SQLERROR EXIT;
set pagesize 0
alter session set max_dump_file_size=0;
/*
before 11g shared latch get function was named kslgetsl()
in 11g - kslgetsl_w()
*/
col shared_latch_function new_value shared_latch_function
var db_v varchar2(100);
var db_comp varchar2(100);
begin dbms_utility.db_version(:db_v,:db_comp); end;
/
select decode(sign(replace(:db_v,'.','')-110000),1,'kslgetsl_w', 'kslgetsl') shared_latch_function from dual;
--//11g use kslgetsl_w,other use kslgetsl.
oradebug setmypid
/* try to get latch as shared in S mode */
oradebug call &shared_latch_function &1 1 2 3 8
/* if ORA-00600: [545] was raised in previous statement then latch was exclusive. The error terminates the script */
/* free the latch */
oradebug call kslfre &1
/* if we are here, the latch was shared */
insert into shared_latches(version,latch#,name,shared) select version,latch#,name,'Y' from v$latch,v$instance where latch#=&2;
commit;
exit
--//說明:作者利用oradebug調用報錯,後面的插入語句不會執行,來完整獲得那些shared latch的列表.
3.執行:
$ . list_shared_latches.sh
--//略.
4.結果:
VERSION LATCH# NAME S
---------- ---------- ---------------------------------------- -
11.2.0.4.0 6 test shared non-parent l0 Y
11.2.0.4.0 14 session idle bit Y
11.2.0.4.0 15 client/application info Y
11.2.0.4.0 21 ksim group membership cache Y
11.2.0.4.0 24 parameter table management Y
11.2.0.4.0 49 resmgr group change latch Y
11.2.0.4.0 50 channel handle pool latch Y
11.2.0.4.0 51 channel operations parent latch Y
11.2.0.4.0 52 message pool operations parent latch Y
11.2.0.4.0 75 sixteenth spare latch - S non-parent Y
11.2.0.4.0 76 seventeenth spare latch - S non-parent Y
11.2.0.4.0 77 eighteenth spare latch - S non-parent Y
11.2.0.4.0 78 nineteenth spare latch - S non-parent Y
11.2.0.4.0 79 twentieth spare latch - S non-parent Y
11.2.0.4.0 80 twenty-first spare latch - S par Y
11.2.0.4.0 81 twenty-second spare latch - S par Y
11.2.0.4.0 82 twenty-third spare latch - S par Y
11.2.0.4.0 83 twenty-fourth spare latch - S par Y
11.2.0.4.0 84 twenty-fifth spare latch - S par Y
11.2.0.4.0 92 SGA mapping latch Y
11.2.0.4.0 93 active service list Y
11.2.0.4.0 102 storage server table manipulation latch Y
11.2.0.4.0 144 name-service namespace bucket Y
11.2.0.4.0 149 gcs remastering latch Y
11.2.0.4.0 150 gcs partitioned table hash Y
11.2.0.4.0 151 gcs pcm hashed value bucket hash Y
11.2.0.4.0 155 recovery domain hash list Y
11.2.0.4.0 160 gcr global ctx Y
11.2.0.4.0 164 Memory Management Latch Y
11.2.0.4.0 171 kcbtsemkid latch Y
11.2.0.4.0 173 buffer pool Y
11.2.0.4.0 177 cache buffers chains Y
11.2.0.4.0 183 tablespace key chain Y
11.2.0.4.0 189 object queue header operation Y
11.2.0.4.0 215 gc element Y
11.2.0.4.0 275 MinActiveScn Latch Y
11.2.0.4.0 280 In memory undo latch Y
11.2.0.4.0 281 KTF sga latch Y
11.2.0.4.0 283 Change Notification Hash table latch Y
11.2.0.4.0 286 change notification client cache latch Y
11.2.0.4.0 289 lob segment hash table latch Y
11.2.0.4.0 290 lob segment query latch Y
11.2.0.4.0 291 lob segment dispenser latch Y
11.2.0.4.0 296 space background SGA latch Y
11.2.0.4.0 301 kssmov protection latch Y
11.2.0.4.0 305 domain validation update latch Y
11.2.0.4.0 306 kdlx hb parent latch Y
11.2.0.4.0 308 Dedup Write Append Table Latch Y
11.2.0.4.0 317 global KZLD latch for mem in SGA Y
11.2.0.4.0 318 Read Only Database Account Status Y
11.2.0.4.0 320 Policy Refresh Latch Y
11.2.0.4.0 321 Policy Hash Table Latch Y
11.2.0.4.0 322 OLS label cache Y
11.2.0.4.0 323 instance information Y
11.2.0.4.0 324 policy information Y
11.2.0.4.0 325 global ctx hash table latch Y
11.2.0.4.0 326 Role grants to users Y
11.2.0.4.0 327 Role graph Y
11.2.0.4.0 328 Security Class Hashtable Y
11.2.0.4.0 331 third Audit Vault latch Y
11.2.0.4.0 332 fourth Audit Vault latch Y
11.2.0.4.0 344 resmgr:active threads Y
11.2.0.4.0 349 resmgr:plan CPU method Y
11.2.0.4.0 355 Shared B-Tree Y
11.2.0.4.0 356 Memory Queue Y
11.2.0.4.0 357 Memory Queue Subscriber Y
11.2.0.4.0 369 ODM-NFS:Global file structure Y
11.2.0.4.0 373 SGA heap creation lock Y
11.2.0.4.0 375 SGA pool creation lock Y
11.2.0.4.0 378 SGA blob lock Y
11.2.0.4.0 380 kgb latch Y
11.2.0.4.0 382 SGA table lock Y
11.2.0.4.0 383 Event Group Locks Y
11.2.0.4.0 385 Sage HT Latch Y
11.2.0.4.0 409 JOX SGA heap latch Y
11.2.0.4.0 410 JOX JIT latch Y
11.2.0.4.0 425 hash table dml freq tracking latch Y
11.2.0.4.0 426 hash table column usage latch Y
11.2.0.4.0 433 compile environment latch Y
11.2.0.4.0 436 Result Cache: RC Latch Y
11.2.0.4.0 464 KWQP Prop Status Y
11.2.0.4.0 465 KWQS pqueue ctx latch Y
11.2.0.4.0 466 KWQS pqsubs latch Y
11.2.0.4.0 467 AQ Propagation Scheduling Proc Table Y
11.2.0.4.0 468 AQ Propagation Scheduling System Load Y
11.2.0.4.0 471 rules engine rule set statistics Y
11.2.0.4.0 472 rules engine rule statistics Y
11.2.0.4.0 477 kwqbsn:qsga Y
11.2.0.4.0 479 bufq statistics Y
11.2.0.4.0 481 queue sender's info. latch Y
11.2.0.4.0 482 bq:time manger info latch Y
11.2.0.4.0 486 KWQMN job cache list latch Y
11.2.0.4.0 487 KWQMN to-be-Stopped Buffer list Latch Y
11.2.0.4.0 504 XDB NFS Stateful SGA Latch Y
11.2.0.4.0 505 qmne Export Table Latch Y
11.2.0.4.0 507 XDB Byte Lock SGA Latch Y
11.2.0.4.0 508 XDB Mcache SGA Latch Y
11.2.0.4.0 565 WCR: sync Y
11.2.0.4.0 566 WCR: processes HT Y
11.2.0.4.0 578 JS Sh mem access Y
11.2.0.4.0 579 PL/SQL warning settings Y
101 rows selected.
--//我導入作者的測試結果在鏈接https://andreynikolaev.wordpress.com/上可以找到.
--//https://andreynikolaev.wordpress.com/summary-tables/shared_latches-ctl/,作者沒有做11.2.0.4測試.
--//11.2.0.3結果如下:
SYS@book> select count(*) from scott.shared_latches where version='11.2.0.3.0';
COUNT(*)
----------
93
