使用oradebug hang住某个进程

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标题：使用oradebug hang住某个进程

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

在一次测试中,需要模拟在归档模式下,数据库发生多次redo切换而这些redo并未被归档的情景,一般来说这样的情况只有在归档目录满的时候会遇到.但是在日常测试中,这样的归档目录满的模拟不太现实,可以通过oradebug SUSPEND来实现该功能,让arcn进程挂起
配置log_archive_max_processes为1(可以配置多个，但是1个更加方便测试)

SQL> show parameter log_archive_max_processes;
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
log_archive_max_processes            integer     1

该配置可以在线修改,但是不重启数据库不一定完全生效(测试环境本来是4,修改为1之后,还有arc0和arc1进程)

查找arcn进程

[oracle@localhost trace]$ ps -ef|grep ora_arc
oracle    3686     1  0 21:07 ?        00:00:00 ora_arc0_test

oradebug进程(session 1)

SQL> oradebug  setospid  3686
Oracle pid: 57, Unix process pid: 3686, image: oracle@localhost.localdomain (ARC0)
SQL> oradebug SUSPEND
Statement processed.

alert日志

Tue Apr 16 21:09:42 2013
Unix process pid: 3686, image: oracle@localhost.localdomain (ARC0) flash frozen [ command #1 ]

切换日志(session 2)

SQL> archive log list;
Database log mode              Archive Mode
Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     53
Next log sequence to archive   55
Current log sequence           55
SQL> alter system switch logfile;
System altered.
SQL> /
System altered.
SQL> alter system checkpoint;
System altered.
SQL> set lines 134
SQL> col member for a40
SQL>   SELECT thread#,
  2           a.sequence#,a.ARCHIVED,
  3           a.group#,
  4           TO_CHAR (first_change#, '9999999999999999') "SCN",
  5           a.status,
  6           MEMBER
  7      FROM v$log a, v$logfile b
  8     WHERE a.group# = B.GROUP#
  9  ORDER BY a.sequence# DESC;
   THREAD#  SEQUENCE# ARC     GROUP# SCN               STATUS           MEMBER
---------- ---------- --- ---------- ----------------- ---------------- ----------------------------
         1         57 NO           3            261053 CURRENT          /data/oracle/oradata/test/redo03.log
         1         56 NO           2            261046 INACTIVE         /data/oracle/oradata/test/redo02.log
         1         55 NO           1            260856 INACTIVE         /data/oracle/oradata/test/redo01.log
SQL> alter system switch logfile;--hang住

此时alert日志

Tue Apr 16 21:10:19 2013
Thread 1 advanced to log sequence 56 (LGWR switch)
  Current log# 2 seq# 56 mem# 0: /data/oracle/oradata/test/redo02.log
Tue Apr 16 21:10:36 2013
Thread 1 advanced to log sequence 57 (LGWR switch)
  Current log# 3 seq# 57 mem# 0: /data/oracle/oradata/test/redo03.log
Tue Apr 16 21:13:13 2013
ORACLE Instance test - Can not allocate log, archival required
Thread 1 cannot allocate new log, sequence 58
All online logs needed archiving
  Current log# 3 seq# 57 mem# 0: /data/oracle/oradata/test/redo03.log

oradebug RESUME(session 1)

SQL> oradebug RESUME
Statement processed.

alert日志

Tue Apr 16 21:14:23 2013
Unix process pid: 3686, image: oracle@localhost.localdomain (ARC0) resumed
Archived Log entry 2 added for thread 1 sequence 55 ID 0x7dd4ccb7 dest 1:
Archived Log entry 3 added for thread 1 sequence 56 ID 0x7dd4ccb7 dest 1:

hang住会话继续执行(session 2)

SQL> alter system switch logfile;
System altered.

One thought on “使用oradebug hang住某个进程” 

  1. SQL> oradebug help
HELP           [command]                 Describe one or all commands
SETMYPID                                 Debug current process
SETOSPID       <ospid>                   Set OS pid of process to debug
SETORAPID      <orapid> ['force']        Set Oracle pid of process to debug
SETORAPNAME    <orapname>                Set Oracle process name to debug
SHORT_STACK                              Get abridged OS stack
CURRENT_SQL                              Get current SQL
DUMP           <dump_name> <lvl> [addr]  Invoke named dump
DUMPSGA        [bytes]                   Dump fixed SGA
DUMPLIST                                 Print a list of available dumps
EVENT          <text>                    Set trace event in process
SESSION_EVENT  <text>                    Set trace event in session
DUMPVAR        <p|s|uga> <name> [level]  Print/dump a fixed PGA/SGA/UGA variable
DUMPTYPE       <address> <type> <count>  Print/dump an address with type info
SETVAR         <p|s|uga> <name> <value>  Modify a fixed PGA/SGA/UGA variable
PEEK           <addr> <len> [level]      Print/Dump memory
POKE           <addr> <len> <value>      Modify memory
WAKEUP         <orapid>                  Wake up Oracle process
SUSPEND                                  Suspend execution
RESUME                                   Resume execution
FLUSH                                    Flush pending writes to trace file
CLOSE_TRACE                              Close trace file
TRACEFILE_NAME                           Get name of trace file
LKDEBUG                                  Invoke global enqueue service debugger
NSDBX                                    Invoke CGS name-service debugger
-G             <Inst-List | def | all>   Parallel oradebug command prefix
-R             <Inst-List | def | all>   Parallel oradebug prefix (return output
SETINST        <instance# .. | all>      Set instance list in double quotes
SGATOFILE      <SGA dump dir>         Dump SGA to file; dirname in double quotes
DMPCOWSGA      <SGA dump dir> Dump & map SGA as COW; dirname in double quotes
MAPCOWSGA      <SGA dump dir>         Map SGA as COW; dirname in double quotes
HANGANALYZE    [level] [syslevel]        Analyze system hang
FFBEGIN                                  Flash Freeze the Instance
FFDEREGISTER                             FF deregister instance from cluster
FFTERMINST                               Call exit and terminate instance
FFRESUMEINST                             Resume the flash frozen instance
FFSTATUS                                 Flash freeze status of instance
SKDSTTPCS      <ifname>  <ofname>        Helps translate PCs to names
WATCH          <address> <len> <self|exist|all|target>  Watch a region of memory
DELETE         <local|global|target> watchpoint <id>    Delete a watchpoint
SHOW           <local|global|target> watchpoints        Show  watchpoints
DIRECT_ACCESS  <set/enable/disable command | select query> Fixed table access
CORE                                     Dump core without crashing process
IPC                                      Dump ipc information
UNLIMIT                                  Unlimit the size of the trace file
PROCSTAT                                 Dump process statistics
CALL           [-t count] <func> [arg1]...[argn]  Invoke function with arguments
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