Oracle Stream忽略大事務 C001: large txn detected

Normal 0 7.8 pt 0 2 false false false MicrosoftInternetExplorer4

Oracle Stream忽略大事務 C001: large txn detected

源資料庫

作業系統：AIX 6.1

資料庫版本：Oracle 10.2.0.4 RAC單向schema級別複製至非RAC

目標資料庫

作業系統：Centos 5.4

資料庫版本：Oracle 11.2.0.2

現象：apply長時間沒有同步，apply error中無報錯資訊，檢視captrue 端資料庫alert發現有下面輸入資訊

1) 檢查源庫的alert log，發現大量large txn detected

C001: large txn detected (76042142 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 04:45:03 2011

C001: large txn detected (78290526 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 04:55:03 2011

C001: large txn detected (80502433 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 05:05:03 2011

C001: large txn detected (82753961 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 05:15:04 2011

C001: large txn detected (85000771 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 05:25:03 2011

C001: large txn detected (87087911 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 05:35:04 2011

C001: large txn detected (89236244 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 05:45:04 2011

C001: large txn detected (91461549 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 05:55:04 2011

C001: large txn detected (93237056 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 06:05:05 2011

C001: large txn detected (95410577 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 06:15:05 2011

C001: large txn detected (97406466 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 06:25:05 2011

C001: large txn detected (99577844 LCRs), xid: 0x0006.023.0000b016

Thu Oct 27 06:35:05 2011

C001: large txn detected (101705806 LCRs), xid: 0x0006.023.0000b016

2) 查詢活動事務和事務號
select xid, xidusn, xidslt, xidsqn, mining_status,xidusn||'.'||xidslt||'.'||xidsqn transaction_id from v$logmnr_transaction where mining_status = 'ACTIVE';

發現有大量xid為0003000D0000945E的logmnr事務,注意這裡的transaction_id下面需要用到

3) 查詢事務的sql_id及其對應的語句

SQL> select distinct sql_id from gv$active_session_history where xid = '0003000D0000945E';

SQL_ID

-------------

0k91g13q8nhqc

SQL> select sql_text from dba_hist_sqltext where sql_id in ('0k91g13q8nhqc');

分析這個語句，為建立一個超過1億條記錄的臨時表，和開發人員確認後這個表可以不進行同步，只是一箇中間表(如果需要使用當然也可以使用其它方式進行同步，如expdp,impdp)

4) 停止捕捉程式、忽略活動事務、啟動捕捉程式

-- #停止Capture程式

begin

dbms_capture_adm.stop_capture(

capture_name => 'CAPTURE_RACDB');

end;

/

-- #這裡的事務ID為了2中的transaction_id

execute dbms_capture_adm.set_parameter('CAPTURE_RACDB','_ignore_transaction','3.13.37982');

-- #啟動Capture程式

begin

dbms_capture_adm.start_capture(

capture_name => 'CAPTURE_RACDB');

end;

/

Apply端忽略大事務

當然從apply端也可以忽略大事務

1) 檢視大事務和原庫執行時間，執行記錄數

SELECT t.xidusn||'.'||t.xidslt||'.'||t.xidsqn transaction_id ,message_count,t.first_message_create_time FROM DBA_APPLY_SPILL_TXN t;

2）忽略大事務

-- #停止Apply程式

begin

dbms_apply_adm.stop_apply(

apply_name => 'APPLY_RACDB_TO_ORA72');

end;

/

SQL> exec dbms_apply_adm.set_parameter('APPLY_RACDB_TO_ORA72','ignore_transaction','6.35.45078');

PL/SQL procedure successfully completed

-- #啟動Apply程式

BEGIN

dbms_apply_adm.start_apply(

apply_name => 'APPLY_RACDB_TO_ORA72');

end;

/

再檢視執行狀態

SELECT sid,apply_name,server_id servid,state,commitscn,total_messages_applied total_mess,apply_time,applied_message_number app_mess_num,applied_message_create_time app_create_time FROM v$streams_apply_server;

[@more@]

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/21605631/viewspace-1055985/，如需轉載，請註明出處，否則將追究法律責任。