oracle分页查询语句
Oracle分页查询格式: 以下是代码: SELECT * FROM ( SELECT A.*, ROWNUM RN FROM (SELECT * FROM 表名) A WHERE ROWNUM <= 40 ) WHERE RN >= 21 其中最内层的查询SELECT * FROM 表名表示不进行翻页的原始查询语句。ROWNUM <= ...
oracle中rownum和rowid的区别
rownum和rowid都是伪列,但是两者的根本是不同的,rownum是根据sql查询出的结果给每行分配一个逻辑编号,所以你的sql不同也就会导致最终rownum不同,但是rowid是物理结构上的,在每条记录insert到数据库中时,都会有一个唯一的物理记录 ,例如 AAAMgzAAEAAAAAgAAB 7499 ALLEN SALESMAN 7698 1981/2/20 1600.00 300.0...
Rebuild Indexes
-----check INDEX SIZE more than 1 gega bytesSELECT OWNER AS OWNER, SEGMENT_NAME AS SEGMENT_NAME, SEGMENT_TYPE, SUM(BYTES) / 1024 / 1024 AS "SEGMENT_SIZE(M)" FROM DBA_SEGMENTS...
ORA-04031 Unable to allocate xx bytes of shared memory
tetrix03_cafia2odb02alert_tetrix03.logUse ADRCI or Support Workbench to package the incident.See Note 411.1 at My Oracle Support for error and packagingdetails.Errors in file/u01/app/oracle/diag/rdbms/tetrix03_cafia2odb02/tetrix03/trace/tetrix03_smon_14876870.trc:ORA-00604: e...
ORA-00600 memory leak
Case study: http://www.ubtools.com/jira/browse/QA-20https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=122257289878491&parent=DOCUMENT&sourceId=39308.1&id=9316980.8&_afrWindowMode=0&_adf.ctrl-state=sjvx2jrlp_49Investigation: https://dioncho.wordpress.com/2009/06/09/707/...
Forcing Log Switches
Forcing Log SwitchesA log switch occurs when LGWR stops writing to one redo log group and starts writing to another. By default, a log switch occurs automatically when the current redo log file group fills.You can force a log switch to make the currently active group inactive and available for r...
FRA空间满
FRA空间满:1、备份Archivelog,释放空间。2、手工清除Flashback log: alter database flashback off。在数据库open阶段,rvwr进程需要加载闪回日志文件,由于找不到所以无法正常启动,而在关闭flashback后,rvwr进程被关闭,相应的闪回文件也被删除。原因: 刚刚看到闪回日志占用空间太多,直接统计OS命令rm删除,导致...
Flashback
there some ways, one of it flashback table to 5minutes beforeflashback table MyTable to timestamp to_timestamp(sysdate-5/1440) --five minutes agoor you can just query it (not changing table)(flashback query)SELECT * FROM MyTable AS OF TIMESTAMP (sysdate -5 /1440);but these are not ...
oracle运行变慢如何办
http://wenku.baidu.com/view/4988a9d6c1c708a1284a44f5<br /><br /><br /><img src="/attachment/201507/26/26477398_1437911324Yy6d.jpg" width="700" height="405.34188034188" alt="" /><img src="/attachment/201507/26/26477398_14379113240tVP.jpg" width="700" height="429.32330827068" alt="" /><img src="/at...
ora-27101 shared memory realm does not exist
<span style="font-family:宋体, Arial;font-size:14px;line-height:25.2000007629395px;white-space:normal;background-color:#FFFFFF;">最近遇到开发库出现自己就挂掉了,内存突然消失,用toad连接数据时报错:</span><br style="font-family:宋体, Arial;font-size:14px;line-height:25.2000007629395px;white-space:norm...
Oracle数据库提高命中率及相关优化
<p style="margin-top:0px;margin-bottom:0px;font-family:Helvetica, Tahoma, Arial, sans-serif;font-size:14px;line-height:25.2000007629395px;white-space:normal;background-color:#FFFFFF;">本文是关于Oracle数据库调试与优化方面的文章,主要介绍Oracle数据库中命中率相关的问题,包括不同的算法之间性能的比对。...
ORA-01950: no privileges on tablespace "example_tbs"
<p style="margin-top:0px;margin-bottom:0px;font-family:Helvetica, Tahoma, Arial, sans-serif;font-size:14px;line-height:25.2000007629395px;white-space:normal;background-color:#FFFFFF;">原因:用户没有此表空间分配EXTENT的权限</p><p style="margin-top:0px;margin-bottom:0px;font-family:Helvetica, Taho...
Oracle数据库经常会遇到CPU利用率很高的情况
<span style="font-family:Helvetica, Tahoma, Arial, sans-serif;font-size:14px;line-height:25.2000007629395px;white-space:normal;background-color:#FFFFFF;">Oracle数据库经常会遇到CPU利用率很高的情况,这种时候大都是数据库中存在着严重性能低下的SQL语句,这种SQL语句大大的消耗了CPU资源,导致整个系统性能低下...
ORA-04030: (kkoutlCreatePh,logdef* : kkoabr) 问题分析及处理?
<h3 style="margin:0px;padding:1.2em 0px 0.3em;border:0px;font-family:serif;font-size:1.2em;font-stretch:normal;line-height:1.4;vertical-align:baseline;color:#333333;white-space:normal;background-color:#FFFFFF;"><strong style="margin:0px;padding:0px;border:0px;font-family:inherit;font-size:inherit;...
ORA-2710,ORA-04031
ORA-27101: shared memory realm does not existtips27101, 00000, "shared memory realm does not exist"// *Cause: Unable to locate shared memory realm// *Action: Verify that the realm is accessible...
ORA-27028、ORA-19511session has exceeded Networker server's parallelism
channel c1: starting piece 1 at08/02/2015 22:30:51RMAN-03009: failure of backupcommand on c1 channel at 02/08/2015 22:34:56ORA-19506: failed to createsequential file, name="FULL_TETRIX21_2173319909_08022015_117_871165851",parms=""ORA-27028: skgfqcre: sbtbackupr...
ORA-00020,TNS-12535,TNS-00505,ORA-1652
ORA-00020: maximum number of processes (1100) exceeded ERROR at line 1: ORA-01012: not logged on What is the cause of this ORA-00020 error and how do I fix it?Answer: The ORA-00020 is a serious production error because a user cannot connect. The ORA-0...
oracle script
SQL> SELECT name,password FROM user$ WHERE name='VISU_MD0000'; //查看user,hash表里的密码NAME PASSWORD------------------------------ ------------------------------VISU_MD0000  ...
Nagios各组件简述及nrpe详解
Nagios各组件简述及NRPE (Nagios Remote Plugin Executor) 详解 一.Nagios各组件简述 由于nagios配置较为繁锁,且里面组件也较多,这里我将几个关键的组件列举一下,且做一下简单的介绍及其和其它组件间的关系的描述。我自己的一些理解,如有偏差,欢迎指正! 我在部署过程中主要用到了以下组件: nagios-3.2.3...
Archivelog & Noarchivelog mode in RMAN
是否归档最主要区别是能够恢复的状态不同。非归档,只能恢复到备份的那个时间点,前提是备份在;归档,可以恢复到之前的任何时间,前提是备份和归档日志都在。在非归档模式下,可以使用RMAN备份read-only和offline的表空间,全库必须停机备份。Noarchivelog mode: 不提供时间点恢复操作或联机备份的功能。Archivel...