[20190415]10g下那些latch是共享的.txt

[20190415]10g下那些latch是共享的.txt http://andreynikolaev.wordpress.com/2010/11/23/shared-latches-by-oracle-version/ --//oracle并没有文档准确说明那些latch是支持共享,作者的链接通过使用orderbug手工调用kslgetsl()函数(10g)或者kslgetsl_w()函 --//数(11g),确定那些latch支持共享模式.我仅仅重复测试看看. 1.环境: SYS@test> @ &r/ver1 PORT_STRING                    VERSION        BANNER ------------------------------ -------------- ---------------------------------------------------------------- x86_64/Linux 2.4.xx            10.2.0.4.0     Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi 2.建立测试脚本: --//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 --//获得latch list.仅仅测试latch parent就ok了.适当编辑整理脚本. $ 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 (Andrey.Nikolaev@rdtex.ru) 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 --//说明:作者利用oradebug调用报错,后面的插入语句不会执行,来完整获得那些shared latch的列表. 3.执行: $　. list_shared_latches.sh > /dev/null --//略. 4.结果: SYS@test> select * from shared_latches; VERSION        LATCH# NAME                                     S ---------- ---------- ---------------------------------------- - 10.2.0.4.0          7 session idle bit                         Y 10.2.0.4.0          8 client/application info                  Y 10.2.0.4.0         35 resmgr group change latch                Y 10.2.0.4.0         36 channel handle pool latch                Y 10.2.0.4.0         37 channel operations parent latch          Y 10.2.0.4.0         38 message pool operations parent latch     Y 10.2.0.4.0         51 SGA mapping latch                        Y 10.2.0.4.0         52 active service list                      Y 10.2.0.4.0         97 name-service namespace bucket            Y 10.2.0.4.0        101 gcs remastering latch                    Y 10.2.0.4.0        102 gcs partitioned table hash               Y 10.2.0.4.0        103 gcs pcm hashed value bucket hash         Y 10.2.0.4.0        106 recovery domain hash list                Y 10.2.0.4.0        109 Memory Management Latch                  Y 10.2.0.4.0        118 buffer pool                              Y 10.2.0.4.0        122 cache buffers chains                     Y 10.2.0.4.0        131 object queue header operation            Y 10.2.0.4.0        150 KCL gc element parent latch              Y 10.2.0.4.0        193 In memory undo latch                     Y 10.2.0.4.0        194 KTF sga latch                            Y 10.2.0.4.0        196 Change Notification Hash table latch     Y 10.2.0.4.0        204 global KZLD latch for mem in SGA         Y 10.2.0.4.0        207 Policy Refresh Latch                     Y 10.2.0.4.0        208 Policy Hash Table Latch                  Y 10.2.0.4.0        209 OLS label cache                          Y 10.2.0.4.0        210 instance information                     Y 10.2.0.4.0        211 policy information                       Y 10.2.0.4.0        212 global ctx hash table latch              Y 10.2.0.4.0        221 library cache hash chains                Y 10.2.0.4.0        229 resmgr:active threads                    Y 10.2.0.4.0        238 resmgr:plan CPU method                   Y 10.2.0.4.0        244 Shared B-Tree                            Y 10.2.0.4.0        245 Memory Queue                             Y 10.2.0.4.0        246 Memory Queue Subscriber                  Y 10.2.0.4.0        271 JOX SGA heap latch                       Y 10.2.0.4.0        284 hash table column usage latch            Y 10.2.0.4.0        291 compile environment latch                Y 10.2.0.4.0        314 KWQP Prop Status                         Y 10.2.0.4.0        315 AQ Propagation Scheduling Proc Table     Y 10.2.0.4.0        316 AQ Propagation Scheduling System Load    Y 10.2.0.4.0        319 rules engine rule set statistics         Y 10.2.0.4.0        320 rules engine rule statistics             Y 10.2.0.4.0        325 kwqbsn:qsga                              Y 10.2.0.4.0        327 bufq statistics                          Y 10.2.0.4.0        329 queue sender's info. latch               Y 10.2.0.4.0        330 bq:time manger info latch                Y 10.2.0.4.0        333 KWQMN job cache list latch               Y 10.2.0.4.0        334 KWQMN to-be-Stopped Buffer list Latch    Y 10.2.0.4.0        392 JS Sh mem access                         Y 10.2.0.4.0        393 PL/SQL warning settings                  Y 50 rows selected. --//我导入作者的测试结果在链接https://andreynikolaev.wordpress.com/上可以找到. --//https://andreynikolaev.wordpress.com/summary-tables/shared_latches-ctl/ --//10.2.0.4.0结果如下: SYS@book> select count(*) from  scott.shared_latches where version='10.2.0.4.0';   COUNT(*) ----------         51 --//相差1个. SYS@192.168.100.33:1521/test> @ ver1 PORT_STRING                    VERSION        BANNER ------------------------------ -------------- ---------------------------------------------------------------- x86_64/Linux 2.4.xx            10.2.0.4.0     Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi SYS@192.168.100.33:1521/test> @ laddr.sql 'parameter table allocation management' ADDR             NAME ---------------- ---------------------------------------- 0000000060009298 parameter table allocation management SYS@book> select * from scott.shared_latches where version='10.2.0.4.0' minus select * from sys.shared_latches@test033; VERSION        LATCH# NAME                                     S ---------- ---------- ---------------------------------------- - 10.2.0.4.0         15 parameter table allocation management    Y --//我手工执行发现报错, SYS@192.168.100.33:1521/test> oradebug setmypid Statement processed. SYS@192.168.100.33:1521/test> oradebug call kslgetsl 0x0000000060009298 1 2 3 8 ORA-00600: internal error code, arguments: [545], [0x060009298], [15], [8], [], [], [], []