Category Archives: Oracle

ORA-1502问题分析解决

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1、出现ORA-1502
接到开发报告，我们报表程序出现SQLCODE=[-1502]错误提示，sql执行不成功，根据这个提示，我猜想是ORA-1502错误，查询ora-1502错误

[oracle@node1 ~]$ oerr ora 1502
01502, 00000, "index '%s.%s' or partition of such index is in unusable state"
// MERGE: 1489 RENUMBERED TO 1502
// *Cause: An attempt has been made to access an index or index partition
//         that has been marked unusable by a direct load or by a DDL
//         operation
// *Action: DROP the specified index, or REBUILD the specified index, or
//         REBUILD the unusable index partition

根据这个提示，错误的原因是因为有index编程unusable state

--查询分区index是否有UNUSABLE的index
SQL> col index_owner for a20
SQL> col index_name for a30
SQL> col partition_name for a20    
SQL>  SELECT INDEX_OWNER, INDEX_NAME, PARTITION_NAME
  2     FROM DBA_IND_PARTITIONS
  3    WHERE INDEX_OWNER NOT IN ('SYS', 'SYSTEM', 'PUBLIC')
  4     AND STATUS = 'UNUSABLE';

INDEX_OWNER          INDEX_NAME                     PARTITION_NAME
-------------------- ------------------------------ --------------------
STAT_YDZJ            IND_STAT_DAY_COMPANY_DAY        P_201111
STAT_YDZJ            IND_STAT_DAY_COMPANY_MOBILE     P_201111
STAT_YDZJ            IND_STAT_DAY_COMPANY_AREA       P_201111

--查询无效全局index和普通index
SQL>  SELECT OWNER, a.index_name
  2     FROM Dba_Indexes  a
  3    WHERE OWNER NOT IN ('SYS', 'SYSTEM', 'PUBLIC')
  4     AND ROWNUM<2;

OWNER                          INDEX_NAME
------------------------------ ------------------------------
STAT_YDZJ                      PK_ND_STAT_DAY_COMPANY

2、解决问题
批量生产sql语句，重建这些unusable index

SELECT 'ALTER INDEX  ' || INDEX_OWNER || '.' || INDEX_NAME ||
       ' REBUILD PARTITION ' || PARTITION_NAME || ' NOLOGGING online;'
  FROM DBA_IND_PARTITIONS
 WHERE INDEX_OWNER NOT IN ('SYS', 'SYSTEM', 'PUBLIC')
   AND STATUS = 'UNUSABLE'
UNION ALL
SELECT 'alter index  ' ||OWNER || '.' || A.INDEX_NAME || ' REBUILD online nologging;'
  FROM DBA_INDEXES A
 WHERE OWNER NOT IN ('SYS', 'SYSTEM', 'PUBLIC')
 AND  STATUS = 'UNUSABLE';

执行完上面sql生成语句后，让开发测试程序，反馈工作正常

3、问题分析
我昨天对STAT_DAY_COMPANY表添加了分区(SPLIT拆分MAXVALUE)，本以为该表的所有index都是local index不知道为何有了一个全局index(公司规定所有分区表都只能建立local index)，所以没有做相关查询，导致这次出现了index无效。但是为什么还有三个local index也变成了unusable，这个估计是大批量append插入数据导致。而开发那边正好是批量append插入数据到STAT_DAY_COMPANY表中，导致出现了ORA-1502错误
建议：处理分区表时，要对index查询清楚，不要按照规定或者惯性思维办事。

时间不同步导致ogg部署异常

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一、错误检查

[oracle@srtcreen ~]$ ggsci

Oracle GoldenGate Command Interpreter for Oracle
Version 11.1.1.1.1 OGGCORE_11.1.1.1.1_PLATFORMS_110729.1700 
Linux, x64, 64bit (optimized), Oracle 10g on Jul 29 2011 19:43:29

Copyright (C) 1995, 2011, Oracle and/or its affiliates. All rights reserved.



GGSCI (srtcreen) 1> info all

Program     Status      Group       Lag           Time Since Chkpt

MANAGER     RUNNING                                           
REPLICAT    RUNNING     R_1         00:00:00      00:00:07    
REPLICAT    RUNNING     R_2         00:00:00      00:00:05    
REPLICAT    ABENDED     R_3         19:19:34      00:17:33    
REPLICAT    STOPPED     R_4         00:00:00      19:44:24    
REPLICAT    STOPPED     R_5         00:00:00      19:44:13    

GGSCI (srtcreen) 2> view report r_3


***********************************************************************
                 Oracle GoldenGate Delivery for Oracle
     Version 11.1.1.1.1 OGGCORE_11.1.1.1.1_PLATFORMS_110729.1700 
   Linux, x64, 64bit (optimized), Oracle 10g on Sep 13 2011 21:33:03
 
Copyright (C) 1995, 2011, Oracle and/or its affiliates. All rights reserved.


                    Starting at 2011-12-02 16:36:58
***********************************************************************

Operating System Version:
Linux
Version #1 SMP Fri Apr 2 14:58:14 EDT 2010, Release 2.6.18-194.el5
Node: srtcreen
Machine: x86_64
                         soft limit   hard limit
Address Space Size   :    unlimited    unlimited
Heap Size            :    unlimited    unlimited
File Size            :    unlimited    unlimited
CPU Time             :    unlimited    unlimited

Process id: 13398

Description: 

***********************************************************************
**            Running with the following parameters                  **
***********************************************************************
replicat r_3
ASSUMETARGETDEFS
HANDLECOLLISIONS
SETENV (NLS_LANG =AMERICAN_AMERICA.ZHS16GBK)
Set environment variable (NLS_LANG=AMERICAN_AMERICA.ZHS16GBK)
userid it1ogg, password ********
--file for dicarded transaction --
discardfile /opt/OGG/discard/R_3.txt, append, megabytes 100
DDL
MAP CSCNEW.TAB_CS_CALL_PICKUP, TARGET SRT_CREEN.TAB_CS_CALL_PICKUP, KEYCOLS (CALL_ID);


CACHEMGR virtual memory values (may have been adjusted)
CACHEBUFFERSIZE:                         64K
CACHESIZE:                              512M
CACHEBUFFERSIZE (soft max):               4M
CACHEPAGEOUTSIZE (normal):                4M
PROCESS VM AVAIL FROM OS (min):           1G
CACHESIZEMAX (strict force to disk):    881M

Database Version:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production

Database Language and Character Set:
NLS_LANG = "AMERICAN_AMERICA.ZHS16GBK" 
NLS_LANGUAGE     = "AMERICAN" 
NLS_TERRITORY    = "AMERICA" 
NLS_CHARACTERSET = "ZHS16GBK" 

For further information on character set settings, please refer to user manual.

***********************************************************************
**                     Run Time Messages                             **
***********************************************************************

Opened trail file /opt/OGG/dirdat/U3000000 at 2011-12-02 16:36:58

MAP resolved (entry CSCNEW.TAB_CS_CALL_PICKUP):
  MAP CSCNEW.TAB_CS_CALL_PICKUP, TARGET SRT_CREEN.TAB_CS_CALL_PICKUP, KEYCOLS (CALL_ID);
Using following columns in default map by name:
  PICKUP_ID, CALL_ID, CALL_SERIAL, USER_ID, PICKUP_TIME, CALL_RESULT, 
  FAIL_REASON, CALL_TIME, CALL_DURA, END_TIME

Using the following key columns for target table SRT_CREEN.TAB_CS_CALL_PICKUP: CALL_ID.


2011-12-02 16:36:58  WARNING OGG-00869  OCI Error ORA-01407: cannot update ("SRT_CREEN"."TAB_CS_CALL_PICKUP"."PICKUP_ID") to NULL (status = 1407), SQL <UPDAT
E "SRT_CREEN"."TAB_CS_CALL_PICKUP" SET "PICKUP_ID" = :a0,"CALL_SERIAL" = :a2,"USER_ID" = :a3,"PICKUP_TIME" = :a4,"CALL_RESULT" = :a5,"FAIL_REASON" = :a6,"CAL
L_TIME" = :a7,"CALL_DURA" = :a8,"END_T>.

2011-12-02 16:36:58  WARNING OGG-01004  Aborted grouped transaction on 'SRT_CREEN.TAB_CS_CALL_PICKUP', Database error 1407 (OCI Error ORA-01407: cannot updat
e ("SRT_CREEN"."TAB_CS_CALL_PICKUP"."PICKUP_ID") to NULL (status = 1407), SQL <UPDATE "SRT_CREEN"."TAB_CS_CALL_PICKUP" SET "PICKUP_ID" = :a0,"CALL_SERIAL" = 
:a2,"USER_ID" = :a3,"PICKUP_TIME" = :a4,"CALL_RESULT" = :a5,"FAIL_REASON" = :a6,"CALL_TIME" = :a7,"CALL_DURA" = :a8,"END_T>).

2011-12-02 16:36:58  WARNING OGG-01003  Repositioning to rba 924 in seqno 0.

2011-12-02 16:36:59  WARNING OGG-01154  SQL error 1407 mapping CSCNEW.TAB_CS_CALL_PICKUP to SRT_CREEN.TAB_CS_CALL_PICKUP OCI Error ORA-01407: cannot update (
"SRT_CREEN"."TAB_CS_CALL_PICKUP"."PICKUP_ID") to NULL (status = 1407), SQL <UPDATE "SRT_CREEN"."TAB_CS_CALL_PICKUP" SET "PICKUP_ID" = :a0,"CALL_SERIAL" = :a2
,"USER_ID" = :a3,"PICKUP_TIME" = :a4,"CALL_RESULT" = :a5,"FAIL_REASON" = :a6,"CALL_TIME" = :a7,"CALL_DURA" = :a8,"END_T>.

2011-12-02 16:36:59  WARNING OGG-01003  Repositioning to rba 924 in seqno 0.

***********************************************************************
*                   ** Run Time Statistics **                         *
***********************************************************************

Last record for the last committed transaction is the following: 
___________________________________________________________________
Trail name :  /opt/OGG/dirdat/U3000000
Hdr-Ind    :     E  (x45)     Partition  :     .  (x04) 
UndoFlag   :     .  (x00)     BeforeAfter:     A  (x41) 
RecLength  :   157 (x009d)    IO Time    : 2011-12-01 21:17:24.084108  
IOType     :    15  (x0f)     OrigNode   :   255  (xff)
TransInd   :     .  (x03)     FormatType :     R  (x52)
SyskeyLen  :     0  (x00)     Incomplete :     .  (x00)
AuditRBA   :       3225       AuditPos   : 42227728
Continued  :     N  (x00)     RecCount   :     1  (x01)

2011-12-01 21:17:24.084108 FieldComp          Len   157 RBA 924
Name: CSCNEW.TAB_CS_CALL_PICKUP
___________________________________________________________________

Reading /opt/OGG/dirdat/U3000000, current RBA 924, 0 records

Report at 2011-12-02 16:36:59 (activity since 2011-12-02 16:36:58)

From Table CSCNEW.TAB_CS_CALL_PICKUP to SRT_CREEN.TAB_CS_CALL_PICKUP:
       #                   inserts:         0
       #                   updates:         0
       #                   deletes:         0
       #                  discards:         1


DDL replication statistics:

                    Operations:         0
             Mapped operations:         0
           Unmapped operations:         0
              Other operations:         0
           Excluded operations:         0
                        Errors:         0
                Retried errors:         0
              Discarded errors:         0
                Ignored errors:         0




Last log location read:
     FILE:      /opt/OGG/dirdat/U3000000
     SEQNO:     0
     RBA:       924
     TIMESTAMP: 2011-12-01 21:17:24.084108
     EOF:       NO
     READERR:   0

2011-12-02 16:36:59  ERROR   OGG-01668  PROCESS ABENDING.

--发现奇怪现象，我2011-12-02早上过来检查这个，发现时间竟然显示2011-12-02 16:36:59，第一反应系统时间错误,继续检查

GGSCI (srtcreen) 2> info r_2

REPLICAT   R_2       Last Started 2011-12-01 21:09   Status RUNNING
Checkpoint Lag       00:00:00 (updated 00:00:05 ago)
Log Read Checkpoint  File /opt/OGG/dirdat/U2000000
                     2011-12-02 17:01:29.927591  RBA 6234

GGSCI (srtcreen) 3> exit
[oracle@srtcreen OGG]$ cd dirdat
[oracle@srtcreen dirdat]$ ll
total 396
-rw-rw-rw- 1 oracle oinstall      0 Dec  1 21:10 U1000000
-rw-rw-rw- 1 oracle oinstall   5984 Dec  2 05:36 U2000000
-rw-rw-rw- 1 oracle oinstall 392258 Dec  2 16:52 U3000000
[oracle@srtcreen dirdat]$ stat U3000000
  File: `U3000000'
  Size: 392258          Blocks: 776        IO Block: 4096   regular file
Device: fd00h/64768d    Inode: 213844220   Links: 1
Access: (0666/-rw-rw-rw-)  Uid: (  501/  oracle)   Gid: (  501/oinstall)
Access: 2011-12-02 16:36:59.000000000 +0800
Modify: 2011-12-02 16:52:55.000000000 +0800
Change: 2011-12-02 16:52:55.000000000 +0800

###############查看源端数据库服务器时间#####################
[oracle@tykf ~]$ date
Fri Dec  2 08:50:10 CST 2011
[oracle@tykf ~]$ ggsci

Oracle GoldenGate Command Interpreter for Oracle
Version 11.1.1.0.0 Build 078
Linux, x64, 64bit (optimized), Oracle 10 on Jul 28 2010 13:21:11

Copyright (C) 1995, 2010, Oracle and/or its affiliates. All rights reserved.



GGSCI (tykf) 1> info all

Program     Status      Group       Lag           Time Since Chkpt

MANAGER     RUNNING                                           
EXTRACT     RUNNING     EXT_1       00:00:00      00:00:05    
EXTRACT     RUNNING     EXT_2       00:00:00      00:00:01    
EXTRACT     RUNNING     EXT_3       00:00:00      00:00:05    
EXTRACT     STOPPED     EXT_4       00:00:00      21:59:56    
EXTRACT     STOPPED     EXT_5       00:00:00      21:59:28    
EXTRACT     RUNNING     P_1         00:00:00      00:00:04    
EXTRACT     RUNNING     P_2         00:00:00      00:00:04    
EXTRACT     RUNNING     P_3         00:00:00      00:00:05    
EXTRACT     STOPPED     P_4         00:00:00      21:56:42    
EXTRACT     STOPPED     P_5         00:00:00      21:56:11    


GGSCI (tykf) 2> info ext_3

EXTRACT    EXT_3     Last Started 2011-12-01 13:11   Status RUNNING
Checkpoint Lag       00:00:00 (updated 00:00:03 ago)
Log Read Checkpoint  Oracle Redo Logs
                     2011-12-02 08:50:06  Seqno 3233, RBA 32267264


GGSCI (tykf) 3> info p_3

EXTRACT    P_3       Last Started 2011-12-01 13:11   Status RUNNING
Checkpoint Lag       00:00:00 (updated 00:00:00 ago)
Log Read Checkpoint  File /opt/OGG/dirdat/extract/A3000000
                     2011-12-02 08:50:15.000000  RBA 393705

--ext_3和p_3是目标端r_3的对应进程
#######################################################################

果然是系统时间错误，源端和目标端相差了近八个小时

二、更正目标端时间

[oracle@srtcreen dirdat]$ date
Fri Dec  2 16:55:55 CST 2011
[oracle@srtcreen OGG]$ su - root
Password: 
[root@srtcreen ~]# date -s 08:58:20
Fri Dec  2  08:58:20 CST
[root@srtcreen ~]# clock -w
[root@srtcreen ~]# date
Fri Dec  2  08:58:28 CST

[root@srtcreen ~]# su - oracle
[oracle@srtcreen dirdat]$ ggsci

Oracle GoldenGate Command Interpreter for Oracle
Version 11.1.1.1.1 OGGCORE_11.1.1.1.1_PLATFORMS_110729.1700 
Linux, x64, 64bit (optimized), Oracle 10g on Jul 29 2011 19:43:29

Copyright (C) 1995, 2011, Oracle and/or its affiliates. All rights reserved.



GGSCI (srtcreen) 1> info all

Program     Status      Group       Lag           Time Since Chkpt

MANAGER     RUNNING                                           
REPLICAT    RUNNING     R_1         00:00:00      unknown     
REPLICAT    RUNNING     R_2         00:00:00      unknown     
REPLICAT    ABENDED     R_3         19:19:34      unknown     
REPLICAT    STOPPED     R_4         00:00:00      11:54:31    
REPLICAT    STOPPED     R_5         00:00:00      11:54:20    
[oracle@srtcreen OGG]$ cd dirdat
[oracle@srtcreen dirdat]$ ll
total 412
-rw-rw-rw- 1 oracle oinstall      0 Dec  1 21:10 U1000000
-rw-rw-rw- 1 oracle oinstall   6485 Dec  2  2011 U2000000
-rw-rw-rw- 1 oracle oinstall 407519 Dec  2 09:04 U3000000

最新写到目标端的数据已经是当前修改时间(这个是系统时间，肯定会修改过来)
出现Time Since Chkpt unknown，处理方法见ogg中Time Since Chkpt显示unknown解决

三、重设r_3时间点

GGSCI (srtcreen) 7> alter r_3,begin 2011-12-02 09:00:00
REPLICAT altered.


GGSCI (srtcreen) 9> start r_3

Sending START request to MANAGER ...
REPLICAT R_3 starting


GGSCI (srtcreen) 10> info all

Program     Status      Group       Lag           Time Since Chkpt

MANAGER     RUNNING                                           
REPLICAT    RUNNING     R_1         00:00:00      00:00:05      
REPLICAT    RUNNING     R_2         00:00:00      00:00:02     
REPLICAT    ABENDED     R_3         unknown       00:00:00    
REPLICAT    STOPPED     R_4         00:00:00      11:55:40    
REPLICAT    STOPPED     R_5         00:00:00      11:55:29    


GGSCI (srtcreen) 11> view report r_3


***********************************************************************
                 Oracle GoldenGate Delivery for Oracle
     Version 11.1.1.1.1 OGGCORE_11.1.1.1.1_PLATFORMS_110729.1700 
   Linux, x64, 64bit (optimized), Oracle 10g on Sep 13 2011 21:33:03
 
Copyright (C) 1995, 2011, Oracle and/or its affiliates. All rights reserved.


                    Starting at 2011-12-02 09:09:31
***********************************************************************

Operating System Version:
Linux
Version #1 SMP Fri Apr 2 14:58:14 EDT 2010, Release 2.6.18-194.el5
Node: srtcreen
Machine: x86_64
                         soft limit   hard limit
Address Space Size   :    unlimited    unlimited
Heap Size            :    unlimited    unlimited
File Size            :    unlimited    unlimited
CPU Time             :    unlimited    unlimited

Process id: 13629

Description: 

***********************************************************************
**            Running with the following parameters                  **
***********************************************************************
replicat r_3
ASSUMETARGETDEFS
HANDLECOLLISIONS
SETENV (NLS_LANG =AMERICAN_AMERICA.ZHS16GBK)
Set environment variable (NLS_LANG=AMERICAN_AMERICA.ZHS16GBK)
userid it1ogg, password ********
--file for dicarded transaction --
discardfile /opt/OGG/discard/R_3.txt, append, megabytes 100
DDL
MAP CSCNEW.TAB_CS_CALL_PICKUP, TARGET SRT_CREEN.TAB_CS_CALL_PICKUP, KEYCOLS (CALL_ID);


CACHEMGR virtual memory values (may have been adjusted)
CACHEBUFFERSIZE:                         64K
CACHESIZE:                              512M
CACHEBUFFERSIZE (soft max):               4M
CACHEPAGEOUTSIZE (normal):                4M
PROCESS VM AVAIL FROM OS (min):           1G
CACHESIZEMAX (strict force to disk):    881M

Database Version:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production

Database Language and Character Set:
NLS_LANG = "AMERICAN_AMERICA.ZHS16GBK" 
NLS_LANGUAGE     = "AMERICAN" 
NLS_TERRITORY    = "AMERICA" 
NLS_CHARACTERSET = "ZHS16GBK" 

For further information on character set settings, please refer to user manual.

***********************************************************************
**                     Run Time Messages                             **
***********************************************************************

Opened trail file /opt/OGG/dirdat/U3000000 at 2011-12-02 09:09:32

MAP resolved (entry CSCNEW.TAB_CS_CALL_PICKUP):
  MAP CSCNEW.TAB_CS_CALL_PICKUP, TARGET SRT_CREEN.TAB_CS_CALL_PICKUP, KEYCOLS (CALL_ID);
Using following columns in default map by name:
  PICKUP_ID, CALL_ID, CALL_SERIAL, USER_ID, PICKUP_TIME, CALL_RESULT, 
  FAIL_REASON, CALL_TIME, CALL_DURA, END_TIME

Using the following key columns for target table SRT_CREEN.TAB_CS_CALL_PICKUP: CALL_ID.


2011-12-02 09:09:32  WARNING OGG-00869  OCI Error ORA-01407: cannot update ("SRT_CREEN"."TAB_CS_CALL_PICKUP"."PICKUP_ID") to NULL (status = 1407), SQL <UPDAT
E "SRT_CREEN"."TAB_CS_CALL_PICKUP" SET "PICKUP_ID" = :a0,"CALL_SERIAL" = :a2,"USER_ID" = :a3,"PICKUP_TIME" = :a4,"CALL_RESULT" = :a5,"FAIL_REASON" = :a6,"CAL
L_TIME" = :a7,"CALL_DURA" = :a8,"END_T>.

2011-12-02 09:09:32  WARNING OGG-01004  Aborted grouped transaction on 'SRT_CREEN.TAB_CS_CALL_PICKUP', Database error 1407 (OCI Error ORA-01407: cannot updat
e ("SRT_CREEN"."TAB_CS_CALL_PICKUP"."PICKUP_ID") to NULL (status = 1407), SQL <UPDATE "SRT_CREEN"."TAB_CS_CALL_PICKUP" SET "PICKUP_ID" = :a0,"CALL_SERIAL" = 
:a2,"USER_ID" = :a3,"PICKUP_TIME" = :a4,"CALL_RESULT" = :a5,"FAIL_REASON" = :a6,"CALL_TIME" = :a7,"CALL_DURA" = :a8,"END_T>).

2011-12-02 09:09:32  WARNING OGG-01003  Repositioning to rba 375833 in seqno 0.

2011-12-02 09:09:32  WARNING OGG-01154  SQL error 1407 mapping CSCNEW.TAB_CS_CALL_PICKUP to SRT_CREEN.TAB_CS_CALL_PICKUP OCI Error ORA-01407: cannot update (
"SRT_CREEN"."TAB_CS_CALL_PICKUP"."PICKUP_ID") to NULL (status = 1407), SQL <UPDATE "SRT_CREEN"."TAB_CS_CALL_PICKUP" SET "PICKUP_ID" = :a0,"CALL_SERIAL" = :a2
,"USER_ID" = :a3,"PICKUP_TIME" = :a4,"CALL_RESULT" = :a5,"FAIL_REASON" = :a6,"CALL_TIME" = :a7,"CALL_DURA" = :a8,"END_T>.

2011-12-02 09:09:32  WARNING OGG-01003  Repositioning to rba 375833 in seqno 0.

Source Context :
  SourceModule            : [er.main]
  SourceID                : [/scratch/angorant/view_storage/angorant_ogg_12978807_x64/oggcore/OpenSys/src/app/er/rep.c]
  SourceFunction          : [take_rep_err_action]
  SourceLine              : [16134]
  ThreadBacktrace         : [8] elements
                          : [/opt/OGG/replicat(CMessageContext::AddThreadContext()+0x26) [0x5ef8b6]]
                          : [/opt/OGG/replicat(CMessageFactory::CreateMessage(CSourceContext*, unsigned int, ...)+0x7b2) [0x5e6382]]
                          : [/opt/OGG/replicat(_MSG_ERR_MAP_TO_TANDEM_FAILED(CSourceContext*, DBString<777> const&, DBString<777> const&, CMessageFactory::Me
ssageDisposition)+0x9b) [0x5c4bcb]]
                          : [/opt/OGG/replicat [0x81ac2f]]
                          : [/opt/OGG/replicat [0x8f73e2]]
                          : [/opt/OGG/replicat(main+0x84b) [0x50764b]]
                          : [/lib64/libc.so.6(__libc_start_main+0xf4) [0x3e2f41d994]]
                          : [/opt/OGG/replicat(__gxx_personality_v0+0x1da) [0x4e3c2a]]

2011-12-02 09:09:32  ERROR   OGG-01296  Error mapping from CSCNEW.TAB_CS_CALL_PICKUP to SRT_CREEN.TAB_CS_CALL_PICKUP.

***********************************************************************
*                   ** Run Time Statistics **                         *
***********************************************************************

Last record for the last committed transaction is the following: 
___________________________________________________________________
Trail name :  /opt/OGG/dirdat/U3000000
Hdr-Ind    :     E  (x45)     Partition  :     .  (x04) 
UndoFlag   :     .  (x00)     BeforeAfter:     A  (x41) 
RecLength  :   157 (x009d)    IO Time    : 2011-12-02 11:52:49.559112  
IOType     :    15  (x0f)     OrigNode   :   255  (xff)
TransInd   :     .  (x03)     FormatType :     R  (x52)
SyskeyLen  :     0  (x00)     Incomplete :     .  (x00)
AuditRBA   :       3233       AuditPos   : 8194064
Continued  :     N  (x00)     RecCount   :     1  (x01)

2011-12-02 11:52:49.559112 FieldComp          Len   157 RBA 375833
Name: CSCNEW.TAB_CS_CALL_PICKUP
___________________________________________________________________

Reading /opt/OGG/dirdat/U3000000, current RBA 375833, 0 records

Report at 2011-12-02 09:09:32 (activity since 2011-12-02 09:09:32)

From Table CSCNEW.TAB_CS_CALL_PICKUP to SRT_CREEN.TAB_CS_CALL_PICKUP:
       #                   inserts:         0
       #                   updates:         0
       #                   deletes:         0
       #                  discards:         1


DDL replication statistics:

                    Operations:         0
             Mapped operations:         0
           Unmapped operations:         0
              Other operations:         0
           Excluded operations:         0
                        Errors:         0
                Retried errors:         0
              Discarded errors:         0
                Ignored errors:         0




Last log location read:
     FILE:      /opt/OGG/dirdat/U3000000
     SEQNO:     0
     RBA:       375833
     TIMESTAMP: 2011-12-02 11:52:49.559112
     EOF:       NO
     READERR:   0


2011-12-02 09:09:32  ERROR   OGG-01668  PROCESS ABENDING.
--这里可以看出我重设的当前的时间点对应的io time为2011-12-02 11:52:49.559112,而现在尚未到这个时间，进程启动失败

GGSCI (srtcreen) 2> alter r_3,begin 2011-12-02 18:00:00
REPLICAT altered.
--重设时间到今天早上我重设时间之前的错误时间之后

GGSCI (srtcreen) 3> start r_3

Sending START request to MANAGER ...
REPLICAT R_3 starting


GGSCI (srtcreen) 4> info all

Program     Status      Group       Lag           Time Since Chkpt

MANAGER     RUNNING                                           
REPLICAT    RUNNING     R_1         00:00:00      00:00:06    
REPLICAT    RUNNING     R_2         00:00:00      00:00:01    
REPLICAT    RUNNING     R_3         unknown       00:00:08    
REPLICAT    RUNNING     R_4         00:00:00      00:00:09    
REPLICAT    RUNNING     R_5         00:00:00      00:00:09    


GGSCI (srtcreen) 5> info all

Program     Status      Group       Lag           Time Since Chkpt

MANAGER     RUNNING                                           
REPLICAT    RUNNING     R_1         00:00:00      00:00:09    
REPLICAT    RUNNING     R_2         00:00:00      00:00:03    
REPLICAT    RUNNING     R_3         00:00:00      00:00:00    
REPLICAT    RUNNING     R_4         00:00:00      00:00:02    
REPLICAT    RUNNING     R_5         00:00:00      00:00:01    


GGSCI (srtcreen) 6> stats r_3

Sending STATS request to REPLICAT R_3 ...

No active replication maps
DDL replication statistics:

*** Total statistics since replicat started     ***
        Operations                                   0.00
        Mapped operations                            0.00
        Unmapped operations                          0.00
        Other operations                             0.00
        Excluded operations                          0.00
        Errors                                       0.00
        Retried errors                               0.00
        Discarded errors                             0.00
        Ignored errors                               0.00
--进程启动，工作正常

三、补充说明
1、部署ogg前需要核对两边时间是否相同，为了避免不必要的麻烦，建议配置ntp同步时间
2、这里因为我们这要求该同步上线无严格时间要求，所以通过重设r_3时间点实现工作正常，如果事情比较紧急，建议删除trail文件，重建pump和replicat进程
3、这里说明ogg同步也还不是和时间一点关系都没有

Data pump 中network_link参数的使用续(登录用户和源端用户不一致处理)

Posted on by

1、准备工作

[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 30 09:08:04 2011

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> create user test identified by xifenfei;

User created.

SQL> grant connect,resource to test;

Grant succeeded.

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

2、远程导出数据

[oracle@node1 ~]$  expdp test/xifenfei directory=test_dir dumpfile=t1.dmp network_link=dblink_test tables=chf.T2_1

Export: Release 11.2.0.3.0 - Production on Wed Nov 30 09:09:35 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
ORA-39002: invalid operation
ORA-39070: Unable to open the log file.
ORA-39087: directory name TEST_DIR is invalid
--对目录需要相关权限

[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 30 09:09:59 2011

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> grant read,write on directory test_dir to test;

Grant succeeded.

SQL>  expdp test/xifenfei directory=test_dir dumpfile=t1.dmp network_link=dblink_test tables=chf.T2_1
SP2-0734: unknown command beginning "expdp test..." - rest of line ignored.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
[oracle@node1 ~]$  expdp test/xifenfei directory=test_dir dumpfile=t1.dmp network_link=dblink_test tables=chf.T2_1

Export: Release 11.2.0.3.0 - Production on Wed Nov 30 09:10:23 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
ORA-31631: privileges are required
ORA-39109: Unprivileged users may not operate upon other users' schemas
--执行导出用户需要相关权限exp_full_database

[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 30 09:11:54 2011

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> grant exp_full_database  to test;

Grant succeeded.

SQL> exit 
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
[oracle@node1 ~]$  expdp test/xifenfei directory=test_dir dumpfile=t1.dmp network_link=dblink_test tables=chf.T2_1

Export: Release 11.2.0.3.0 - Production on Wed Nov 30 09:14:29 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
Starting "TEST"."SYS_EXPORT_TABLE_01":  test/******** directory=test_dir dumpfile=t1.dmp network_link=dblink_test tables=chf.T2_1 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 22 MB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "CHF"."T2_1"                                9.326 MB  100000 rows
Master table "TEST"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for TEST.SYS_EXPORT_TABLE_01 is:
  /tmp/t1.dmp
Job "TEST"."SYS_EXPORT_TABLE_01" successfully completed at 09:14:35
--实现用test登录，导出源端chf用户下面的表

[oracle@node1 ~]$ rm /tmp/t1.dmp
[oracle@node1 ~]$  expdp test/xifenfei directory=test_dir dumpfile=t1.dmp network_link=dblink_test tables=T2_1

Export: Release 11.2.0.3.0 - Production on Wed Nov 30 09:14:57 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
ORA-39001: invalid argument value
ORA-39195: At least one schema in the TABLE_FILTER does not exist.
--如果当前登录用户和表所属用户不同，需要指定schema的名称

3、直接导入数据到目标端

[oracle@node1 ~]$ impdp test/xifenfei directory=test_dir network_link=dblink_test REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users tables=chf.t2_1

Import: Release 11.2.0.3.0 - Production on Wed Nov 30 09:45:38 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
ORA-31631: privileges are required
ORA-39109: Unprivileged users may not operate upon other users' schemas
--登录用户需要imp_full_database权限

[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Wed Nov 30 09:46:41 2011

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> grant imp_full_database to test;

Grant succeeded.

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
[oracle@node1 ~]$ impdp test/xifenfei directory=test_dir network_link=dblink_test REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users tables=chf.t2_1

Import: Release 11.2.0.3.0 - Production on Wed Nov 30 09:46:59 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
Starting "TEST"."SYS_IMPORT_TABLE_01":  test/******** directory=test_dir network_link=dblink_test REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users tables=chf.t2_1 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 22 MB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . imported "XFF"."T2_1"                                100000 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "TEST"."SYS_IMPORT_TABLE_01" successfully completed at 09:47:07
--使用test用户登录，目标端用户为xff，源端用户为chf

[oracle@node1 ~]$ impdp test/xifenfei directory=test_dir network_link=dblink_test REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users tables=t2_1

Import: Release 11.2.0.3.0 - Production on Wed Nov 30 09:52:54 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
ORA-39001: invalid argument value
ORA-39195: At least one schema in the TABLE_FILTER does not exist.
--不同用户时，需要指定源端表所属用户

Data pump 中network_link参数的使用

Posted on by

一、准备工作
1、源端

[oracle@ECP-UC-DB1 ~]$ sqlplus  chf/xifenfei

SQL*Plus: Release 10.2.0.4.0 - Production on Tue Nov 29 15:07:35 2011

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL>  select count(*) from T2_1 ;

  COUNT(*)
----------
    100000

2、目标端

--tns配置
test =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.11.12)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = test)
    )
  )
[oracle@node1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on Tue Nov 29 14:57:08 2011

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> create public database link dblink_test  
  2  connect to chf identified by xifenfei using 'test';

Database link created.

SQL> grant read,write on directory test_dir to xff;

Grant succeeded.

二、导入方式
1、expdp导出，impdp导入

[oracle@node1 ~]$ expdp chf/xff directory=test_dir dumpfile=t1_2.dmp network_link=dblink_test tables=T2_1

Export: Release 11.2.0.3.0 - Production on Tue Nov 29 15:05:36 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
Starting "CHF"."SYS_EXPORT_TABLE_01":  chf/******** directory=test_dir dumpfile=t1_2.dmp network_link=dblink_test tables=T2_1 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 22 MB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "CHF"."T2_1"                                9.326 MB  100000 rows
Master table "CHF"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for CHF.SYS_EXPORT_TABLE_01 is:
  /tmp/t1_2.dmp
Job "CHF"."SYS_EXPORT_TABLE_01" successfully completed at 15:06:52
--1、userid使用的是目标端（expdp端）登录
--2、tables对应的表所有者需要和userid相同

[oracle@node1 tmp]$ ll /tmp/t1_2.dmp
-rw-r----- 1 oracle oinstall 9859072 11-29 15:06 /tmp/t1_2.dmp
[oracle@node1 tmp]$ impdp xff/xifenfei directory=test_dir dumpfile=t1_2.dmp REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users 

Import: Release 11.2.0.3.0 - Production on Tue Nov 29 15:30:15 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
Master table "XFF"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "XFF"."SYS_IMPORT_FULL_01":  xff/******** directory=test_dir dumpfile=t1_2.dmp REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users 
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "XFF"."T2_1"                                9.326 MB  100000 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "XFF"."SYS_IMPORT_FULL_01" successfully completed at 15:30:18
[oracle@node1 tmp]$ sqlplus xff/xifenfei

SQL*Plus: Release 11.2.0.3.0 Production on Tue Nov 29 15:30:43 2011

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> select count(*) from t2_1;

  COUNT(*)
----------
    100000

2、使用impdp直接导入

[oracle@node1 tmp]$ impdp chf/xff directory=test_dir network_link=dblink_test REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users tables=t2_1

Import: Release 11.2.0.3.0 - Production on Tue Nov 29 15:48:49 2011

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
Starting "CHF"."SYS_IMPORT_TABLE_01":  chf/******** directory=test_dir network_link=dblink_test REMAP_SCHEMA=chf:xff REMAP_TABLESPACE=odu:users tables=t2_1 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 22 MB
Processing object type TABLE_EXPORT/TABLE/TABLE
. . imported "XFF"."T2_1"                                100000 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "CHF"."SYS_IMPORT_TABLE_01" successfully completed at 15:49:00
--1、userid使用的是impdp端登录
--2、tables对应的表所有者需要和userid相同(tables的表所有者是源端，使用REMAP_SCHEMA映射owner)

[oracle@node1 tmp]$ sqlplus xff/xifenfei

SQL*Plus: Release 11.2.0.3.0 Production on Tue Nov 29 15:51:18 2011

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options

SQL> select count(*) from t2_1;

  COUNT(*)
----------
    100000

如果登录用户和需要导入的表用户名不同，暂不清楚怎么处理

因域名解析导致数据库连接延迟分析

Posted on by

一、现状记录

[oracle@node1 ~]$ /sbin/ifconfig
eth1      Link encap:Ethernet  HWaddr 00:25:90:04:AB:6B  
          inet addr:192.168.9.140  Bcast:192.168.15.255  Mask:255.255.248.0
          inet6 addr: fe80::225:90ff:fe04:ab6b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:23530402 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10959123 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:15308483748 (14.2 GiB)  TX bytes:10087987532 (9.3 GiB)
--IP地址为192.168.9.140

[oracle@node1 ~]$ more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               ecp-db localhost.localdomain localhost
192.168.9.140   node1.srtcloud.com
--域名node1.srtcloud.com对应ip192.168.9.140 

[oracle@node1 ~]$ lsnrctl status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=node1.srtcloud.com)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 10.2.0.5.0 - Production
Start Date                04-NOV-2011 09:08:51
Uptime                    21 days 4 hr. 58 min. 45 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /opt/oracle/product/10.2.0/db_1/network/admin/listener.ora
Listener Log File         /opt/oracle/product/10.2.0/db_1/network/log/listener.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=node1.srtcloud.com)(PORT=1521)))
Services Summary...
Service "ecp" has 2 instance(s).
  Instance "ecp", status UNKNOWN, has 1 handler(s) for this service...
  Instance "ecp", status READY, has 1 handler(s) for this service...
Service "ecpXDB" has 1 instance(s).
  Instance "ecp", status READY, has 1 handler(s) for this service...
Service "ecp_XPT" has 1 instance(s).
  Instance "ecp", status READY, has 1 handler(s) for this service...
Service "ora11g" has 2 instance(s).
  Instance "ora11g", status UNKNOWN, has 1 handler(s) for this service...
  Instance "ora11g", status READY, has 1 handler(s) for this service...
Service "ora11gXDB" has 1 instance(s).
  Instance "ora11g", status READY, has 1 handler(s) for this service...
The command completed successfully
--说明:ora11g是oracle 11g，ecp是oracle 10g
--当前使用域名node1.srtcloud.com监听

[oracle@node1 ~]$ more /opt/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora 
# tnsnames.ora Network Configuration File: /opt/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

ECP =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = node1.srtcloud.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = ecp)
    )
  )

ORA11G =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = node1.srtcloud.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = ora11g)
    )
  )
--tns也通过域名访问

[oracle@node1 ~]$ more /etc/resolv.conf 
nameserver 211.155.235.201
nameserver 211.155.235.188
--当前有效的dns服务器

[oracle@node1 ~]$ more /etc/nsswitch.conf |grep hosts:
hosts:     files dns
--域名解析顺序

二、数据库正常工作分析
1、tns工作：客户端通过tns访问数据库，tns配置的是域名访问，所以需要解析，因为此刻解析的顺序是先利用/etc/hosts解析，所以读取hosts文件，获取到ip，然后访问对应数据库，和监听接触。
2、监听工作：监听的是域名，其实也是通过hosts解析成ip的
3、这里能够正常的工作，是因为hosts文件解析了域名

三、模拟数据库访问延迟

[oracle@node1 ~]$ more /etc/nsswitch.conf |grep hosts:
hosts:     dns files
--先使用dns服务器解析，再使用hosts文件

[oracle@node1 ~]$ more /etc/resolv.conf 
nameserver 11.1.1.1
--无效的dns服务器

[oracle@node1 ~]$ sqlplus chf/xifenfei@ora11g

SQL*Plus: Release 10.2.0.5.0 - Production on Fri Nov 25 14:44:55 2011

Copyright (c) 1982, 2010, Oracle.  All Rights Reserved.
--会在这里一个很长的时间等待

[oracle@node1 ~]$ lsnrctl status

LSNRCTL for Linux: Version 10.2.0.5.0 - Production on 25-NOV-2011 14:48:26

Copyright (c) 1991, 2010, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=node1.srtcloud.com)(PORT=1521)))
--也会一个长时间的等待

--问题原因:就是因为解析域名的时候，先去访问dns服务器，因为该ip非dns服务器ip，所以会一直等待该ip超时，
--然后访问hosts文件获取ip地址（这个就是为什么我们登录或者查看监听状态的时候，会出现如此长的时间的等待）

其实因为dns延迟的现象有很多种，我这里只是举了一个最简单，比较常见的例子，在处理因dns解析的监听延迟的问题上，可以参考下面几点:
1、如果非特殊情况，尽可能使用ip地址在监听和tns中
2、如果是使用域名，请尽可能使用hosts解析，解析顺序配置为files优先（因为dns服务器有很多不确定，不可控因素）
3、如果一定要使用dns服务器解析，请把稳定的dns服务器配置在第一项，尽可能避免出现dns服务器不可达或者不存在该域名的现象