weejar zhang

oracle ACE, A DBA, blogger.

Script: RMAN backup shell on linux

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# make direcory for backset file and scripts file,in my case /backup/db_bak cd   /backup/db_bak mkdir  scripts logs rman #  the following is contents of  rman_backup_sh vi  /backup/db_bak/scripts/rman_backup_sh #!/bin/bash # author: anbob.com # desc: rman backup database level 0 # contact: weejar@gmail.com export ORACLE_HOME=/oracle/product/11.2.0/db_1 export ORACLE_SID=pora40 RMAN_LOG_FILE=/backup/db_bak/logs/rman_database_backup.`date +%y%m%d%H%M`.out # —————————————————————– # Initialize the log file. # … Read more

How to hanganalyze and systemstate dumps for Oracle database？

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Oracle support request hang analysis and system state dumps when rasing SR. One 10.1 or higher versions login as sqlplus -prelim / as sysdba To do a hanganalyze oradebug setmypid; oradebug unlimit; oradebug hanganalyze 3; Wait 60 – 90 seconds and run the last command again to identify the process state changes. To get a … Read more

script:purge ADR file

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[oracle@db231 ~]$ ./adr_purge
INFO: Purge started at Thu May 16 07:35:32 CST 2013
INFO: adrci purge started at Thu May 16 07:35:32 CST 2013
INFO: adrci purging diagnostic destination diag/tnslsnr/db231/listener
INFO: purging ALERT older than 90 days …
INFO: purging INCIDENT older than 30 days …

Tuning “Backup:sbtbackup” Event

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A few days ago a friend ask me to see a awr issue. In the TOP 5 Times Events, as you see, Obviously,database has relatively high sbtbackup wait event, Backup:sbtbackup falls under the administrative category also realted to the RMAN. These wait events will occur when there is RMAN backup running on the server. Backup: … Read more

一次expdp/impdp迁移案例

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因一次硬件原因导致了服务器异常停机，防止蝴蝶效应及时进行了数据迁移，一周发现了这个决定正确的。 申请了2小时的停机时间。因数据不大且表空间开始使用不规范决定用expdp数据泵方式迁移。 在新设备 1, raid10+安装OS 2，安装oracle 10.2.0.1(single instance)+ 3，升级oracle 10.2.0.5 4，建库, 5, 调整INSTANCE参数,调整temp tbs、redo file size、undo tbs大小 6，创建app schema、创建data\index tablespace 用时1小时左右 stop web app+挂通知 stop listener sys@TOPBOX>select object_type,count(*) cnt from dba_objects where owner=’TOPBOX’ GROUP BY OBJECT_TYPE; OBJECT_TYPE CNT ——————- ——————– SEQUENCE 802 PROCEDURE 25 DATABASE LINK 2 LOB 3 TRIGGER 3 MATERIALIZED VIEW 2 TABLE … Read more

力挺一下sqluldr

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客户要求导出大量的数据(约800万记录)，开始为了格式上的好看生成的是ACCESS数据库文件，用Toad 11导出成生ACCESS，本地域名网的DB，生成700W生成的文件有1G多点，都用了约三个小时，更悲惨的是三个小时后，弹出的一个错误窗口，提示无空间，莫名其妙，硬盘空间很充足，当时的心情可真是”唯有长江水无语东流…” 变通一下800万的记录在ACCESS也没有可读性，无非是数据导入，所以考虑生成flat file,文本文件的形式。 想到了老楼的小工具sqluldr，free命令行操作方便。 下面是真实的操作，早知如此何必加那三小时班。 [oracle@dev-db ~]$ ./sqluldr2 user=icme6/icme6 query=”select /*+parallel(t 8)*/* from sdscore t” file=sd_score.txt field=0x09 record=0x0d0x0a 0 rows exported at 2013-04-12 19:59:18, size 0 MB. 1000000 rows exported at 2013-04-12 19:59:21, size 200 MB. 2000000 rows exported at 2013-04-12 19:59:24, size 320 MB. 3000000 rows exported at 2013-04-12 19:59:27, size 420 MB. … Read more