[20170824]11G备库启用DRCP连接.txt

[20170824]11G备库启用DRCP连接.txt

--//参考链接:
http://blog.itpub.net/267265/viewspace-2099397/
blogs.oracle.com/database4cn/adg%e5%a4%87%e5%ba%93%e7%9a%84drcp%e8%bf%9e%e6%8e%a5%e6%8a%a5%e9%94%99oci-21500%e8%a7%a3%e5%86%b3%e4%b8%80%e4%be%8b

1.测试环境:

SYS@bookdg> startup
ORACLE instance started.

Total System Global Area  634732544 bytes
Fixed Size                  2255792 bytes
Variable Size             197133392 bytes
Database Buffers          427819008 bytes
Redo Buffers                7524352 bytes
Database mounted.
Database opened.

SYS@bookdg> @ 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

SYS@bookdg> alter database recover managed standby database using current logfile disconnect ;
Database altered.

SYS@bookdg> exec dbms_connection_pool.start_pool();
BEGIN dbms_connection_pool.start_pool(); END;

*
ERROR at line 1:
ORA-56501: DRCP: Pool startup failed
ORA-56501: DRCP: Pool startup failed
ORA-06512: at "SYS.DBMS_CONNECTION_POOL", line 4
ORA-06512: at line 1

--//奇怪我启动就报错!!先在主库执行启动,然后备库执行启动.

SYS@book> exec dbms_connection_pool.start_pool()
PL/SQL procedure successfully completed.

SYS@bookdg> exec dbms_connection_pool.start_pool();
PL/SQL procedure successfully completed.

--//这样ok了.

2.测试备库是否能连接使用POOL.

$ sqlplus scott/book@192.168.100.40:1521/bookdg:POOLED

SQL*Plus: Release 11.2.0.4.0 Production on Thu Aug 24 09:22:44 2017

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

ERROR:
ORA-56600: DRCP: Illegal call [First call inconsistency]

Errors in file :
OCI-21500: internal error code, arguments: [kpplcSyncState:Error in sync], [56600], [], [], [], [], [], []
Errors in file :
OCI-21500: internal error code, arguments: [kgepop: no error frame to pop to], [], [], [], [], [], [], []
OCI-21500: internal error code, arguments: [kpplcSyncState:Error in sync], [56600], [], [], [], [], [], []
Errors in file :
OCI-21500: internal error code, arguments: [kgepop: no error frame to pop to], [], [], [], [], [], [], []
OCI-21500: internal error code, arguments: [kpplcSyncState:Error in sync], [56600], [], [], [], [], [], []
b?縝?縝?縝??

--//可以发现连接报错.OCI-21500.

$ oerr ora 56600
56600, 0000, "DRCP: Illegal call [%s]"
// *Cause: An illegal OCI function call was issued.
// *Action: Check the documentation for Database Resident Connection Pool (DRCP) usage.

$ oerr oci 21500
21500, 00000, "internal error code, arguments: [%s], [%s], [%s], [%s], [%s], [%s], [%s], [%s]"
// *Cause:  This is the generic error number for the OCI
//          environment (client-side) internal errors.  This indicates
//          that the OCI environment has encountered an exceptional
//          condition.
// *Action: Report as a bug - the first argument is the internal error number.

--//作者采用跟踪包,发现执行dml语句,因为备库是只读打开,应用日志.

SCOTT@bookdg> select * from emp for update;
select * from emp for update
              *
ERROR at line 1:
ORA-16000: database open for read-only access

--//作者通过跟踪16000事件,确定问题语句.

SYS@bookdg> alter system set events='16000 trace name errorstack forever,level 12';
System altered.

--//再次执行:
$ sqlplus scott/book@192.168.100.40:1521/bookdg:POOLED
SQL*Plus: Release 11.2.0.4.0 Production on Thu Aug 24 09:31:54 2017
Copyright (c) 1982, 2013, Oracle.  All rights reserved.
ERROR:
ORA-56600: DRCP: Illegal call [First call inconsistency]

--//alert显示如下:
Errors in file /u01/app/oracle/diag/rdbms/bookdg/bookdg/trace/bookdg_l002_22744.trc:
ORA-16000: database open for read-only access
Dumping diagnostic data in directory=[cdmp_20170824093412], requested by (instance=1, osid=22744 (L002)), summary=[abnormal process termination].
Dumping diagnostic data in directory=[cdmp_20170824093413], requested by (instance=1, osid=22744 (L002)), summary=[abnormal process termination].

*** 2017-08-24 09:32:00.997
dbkedDefDump(): Starting a non-incident diagnostic dump (flags=0x0, level=3, mask=0x0)
----- Error Stack Dump -----
ORA-16000: database open for read-only access
----- Current SQL Statement for this session (sql_id=4m7m0t6fjcs5x) -----
update seq$ set increment$=:2,minvalue=:3,maxvalue=:4,cycle#=:5,order$=:6,cache=:7,highwater=:8,audit$=:9,flags=:10 where obj#=:1

--//不知道作者如何猜出audit$=:9,与审计有关...

$ ps -ef | grep l002
oracle   22744     1  1 09:19 ?        00:00:14 ora_l002_bookdg

$ ps -ef | grep -e ora_l0 -e ora_n0 | grep -v grep
oracle   22738     1  0 09:19 ?        00:00:00 ora_n000_bookdg
oracle   22740     1  0 09:19 ?        00:00:00 ora_l000_bookdg
oracle   22742     1  0 09:19 ?        00:00:00 ora_l001_bookdg
oracle   22744     1  0 09:19 ?        00:00:14 ora_l002_bookdg
oracle   22746     1  0 09:19 ?        00:00:00 ora_l003_bookdg

ora_n000_XXX => Connection Broker Process
ora_l000_XXX => Pooled Server Process(Handles client requests in Database Resident Connection Pooling)

3.如果真是审计引起的,关闭就ok了.
--//实际上对于备库及时审计打开的,备库也会设置为OS.备库设置read only时,alert提示如下:
Thu Aug 24 10:02:39 2017
ALTER DATABASE OPEN
AUDIT_TRAIL initialization parameter is changed to OS, as DB,EXTENDED is NOT compatible for database opened with read-only access

SYS@bookdg> show parameter audit_trail
NAME        TYPE   VALUE
----------- ------ -------
audit_trail string OS

SYS@bookdg> show spparameter audit_trail
SID      NAME         TYPE    VALUE
-------- ------------ ------- ---------
*        audit_trail  string  DB
*        audit_trail  string  EXTENDED

--//修改为none看看.先备份
$ cp spfilebookdg.ora spfilebookdg.ora_20170824

SYS@bookdg> alter system set audit_trail=none scope=spfile ;
System altered.

--//重启看看.
SYS@bookdg> alter database recover managed standby database cancel ;
Database altered.

SYS@bookdg> shutdown immediate ;
Database closed.
Database dismounted.
ORACLE instance shut down.
SYS@bookdg> startup
ORACLE instance started.
Total System Global Area  634732544 bytes
Fixed Size                  2255792 bytes
Variable Size             197133392 bytes
Database Buffers          427819008 bytes
Redo Buffers                7524352 bytes
Database mounted.
Database opened.

SYS@bookdg> alter database recover managed standby database using current logfile disconnect ;
Database altered.

SYS@bookdg> exec dbms_connection_pool.start_pool();
PL/SQL procedure successfully completed.

$ sqlplus scott/book@192.168.100.40:1521/bookdg:POOLED
SQL*Plus: Release 11.2.0.4.0 Production on Thu Aug 24 09:59:16 2017
Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SCOTT@192.168.100.40:1521/bookdg:POOLED> select * from dept ;
    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON

SCOTT@192.168.100.40:1521/bookdg:POOLED> select * from dept for update ;
select * from dept for update
              *
ERROR at line 1:
ORA-16000: database open for read-only access

--//OK,现在能使用DRCP在备库连接数据库了.