如何跟踪Oracle动态服务注册

如何trace Oracle PMON进程动态注册过程?这个问题我想到2个答案,对PMON做event trace或者采用Oracle Network Server因该都可以达到目的。
让我们来实践一下!

Oracle Network Server Trace模式

1. 启用Oracle SqlNet服务器端trace,这需要我们修改sqlnet.ora配置文件

[maclean@rh2 ~]$ echo "TRACE_LEVEL_SERVER = 16
> TRACE_FILE_SERVER = SERVER
> TRACE_DIRECTORY_SERVER= /home/maclean/ntrc"  > $ORACLE_HOME/network/admin/sqlnet.ora
[maclean@rh2 ~]$ cat $ORACLE_HOME/network/admin/sqlnet.ora
TRACE_LEVEL_SERVER = 16
TRACE_FILE_SERVER = SERVER
TRACE_DIRECTORY_SERVER= /home/maclean/ntrc

2. 触发trace

SQL> conn / as sysdba
Connected.

SQL>  select spid from V$process, V$session where audsid=userenv('SESSIONID') and paddr=addr;
SPID
------------
4264

SQL> alter system register;
System altered.

/*在之前指定的TRACE_DIRECTORY_SERVER目录下将出现形如server_$spid.trc的trace文件*/

[maclean@rh2 ntrc]$ cat server_4290.trc|grep nsprecv|grep -A 2 -B 2 reg
[20-AUG-2010 10:42:53:896] nsprecv: 00 00 00 00 00 15 61 6C  |......al|
[20-AUG-2010 10:42:53:896] nsprecv: 74 65 72 20 73 79 73 74  |ter.syst|
[20-AUG-2010 10:42:53:896] nsprecv: 65 6D 20 72 65 67 69 73  |em.regis|
[20-AUG-2010 10:42:53:896] nsprecv: 74 65 72 01 00 00 00 01  |ter.....|
[20-AUG-2010 10:42:53:896] nsprecv: 00 00 00 00 00 00 00 00  |........|

/*分析该trace文件后可以匹配到以上动态注册语句*/

/*记得将server端sqlnet trace设置disable掉*/

[maclean@rh2 ntrc]$ echo "" > $ORACLE_HOME/network/admin/sqlnet.ora

PMON TRACE模式
1.找出PMON的进程号

SQL> select spid ,program from v$process where program like '%PMON%';

SPID         PROGRAM
------------ ------------------------------------------------
4050         oracle@rh2 (PMON)

2.执行10257事件trace

SQL> oradebug setospid 4050;
Oracle pid: 2, Unix process pid: 4050, image: oracle@rh2 (PMON)

SQL> oradebug event 10257 trace name context forever,level 16;
Statement processed.

SQL> alter system register;
System altered.

SQL> oradebug event 10257 trace name context off;
Statement processed.

SQL> oradebug tracefile_name;
/s01/10gdb/admin/YOUYUS/bdump/youyus_pmon_4050.trc

cat /s01/10gdb/admin/YOUYUS/bdump/youyus_pmon_4050.trc
.......................
kmmlrl: register now
kmmgdnu: cXDB
         goodness=0, delta=1,
         flags=0x5:unblocked/not overloaded, update=0x6:G/D/-
kmmgdnu: YOUYUS
         goodness=0, delta=1,
         flags=0x4:unblocked/not overloaded, update=0x6:G/D/-
kmmlrl: nsgr update returned 0
kmmlrl: nsgr register returned 0

/*可以看到注册了YOUYUS和cXDB2个service的过程*/

若无法正常注册可以按照以下步骤检查:
1. 检查Oracle Net命名方式是否正确设置,该参数由sqlnet.ora配置文件中的NAMES.DIRECTORY_PATH指定。
2. 确认SQL NET配置文件如sqlnet.ora,tnsnames.ora等的位置正确配载。
3. 检查是否设置了TNS_ADMIN环境变量,该变量将影响配置文件的正确路径。
4. 确认LOCAL_LISTENER或REMOTE_LISTENER中指定的service可以被正常tnsping通,若以上参数未指定值则尝试步骤6。
5. 确认主机名可以被正确解析为ip地址,如以下示例:

C:\Users\weisly>nslookup www.oracle.com
服务器:  dir-605
Address:  192.168.0.1

非权威应答:
名称:    a398.g.akamai.net.0.1.cn.akamaitech.net
Addresses:  117.104.136.98
          117.104.136.128
Aliases:  www.oracle.com
          www.oracle.com.edgesuite.net
          a398.g.akamai.net

6. 修改LOCAL_LISTENER为非服务别名解析的形式,这样可以排除配置文件可能造成的影响,从而确认问题是否由配置文件设置不当而引起:

SQL> conn / as sysdba
Connected.

SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=rh2)(PORT=1521)))';
System altered.

SQL> alter system set REMOTE_LISTENER=' (ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = rh1)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = rh2)(PORT = 1521)))';
System altered.

7. 将主机名替换为ip地址并测试是否解决问题。
8. 以IPC协议替代常见的TCP协议测试,绕过TCP和主机名等因素可能造成的问题,以确认问题是否由这些因素引起:

SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=KEY1)))';
System altered.

/*其中KEY值需要和listener.ora中指定的一致。*/

SQL> host
[maclean@rh2 admin]$ lsnrctl status KEY1

LSNRCTL for Linux: Version 10.2.0.4.0 - Production on 20-AUG-2010 11:30:06
Copyright (c) 1991, 2007, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=KEY1)))
STATUS of the LISTENER
------------------------
Alias                     KEY1
Version                   TNSLSNR for Linux: Version 10.2.0.4.0 - Production
Start Date                20-AUG-2010 11:29:15
Uptime                    0 days 0 hr. 0 min. 50 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /s01/10gdb/network/admin/listener.ora
Listener Log File         /s01/10gdb/network/log/key1.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=KEY1)))
Services Summary...
Service "YOUYUS" has 1 instance(s).
  Instance "YOUYUS", status READY, has 1 handler(s) for this service...
Service "YOUYUS_XPT" has 1 instance(s).
  Instance "YOUYUS", status READY, has 1 handler(s) for this service...
Service "cXDB" has 1 instance(s).
  Instance "YOUYUS", status READY, has 10 handler(s) for this service...
The command completed successfully

实在不行的话,我们还是提SR吧!

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