oracle.sysman.emSDK.emd.comm.OperationException: could not write to...
Today, when I configure Oracle 10g grid control agent on web,I encountered this error: 1 oracle.sysman.emSDK.emd.comm.OperationException: could not write to targets.xml.bak file after searching from...
View ArticleHow to reslove ORA-08104 : this index object is being online built or rebuilt
SQL> alter index S.SYS_C007740 rebuild online tablespace s_data01; alter index S.SYS_C007740 rebuild online tablespace s_data01 * ERROR at line 1: ORA-08104: this index object 75350 is being online...
View ArticleOCP Done!
8月14号，考完最后一门，拖了三个月之久的OCP考试终于结束了。本可以很快考完，却拖了这么久，一来因为太懒，而且时间足够就懒散了一点，没有给自己太大压力。二来因为最近工作确实太忙，要学习的很多，留给准备的时间就很少。不过结果总算还不错，3个100分，意料之中却有梦想之外。除了要感谢一下一直理解我的王同学之外，整个过程没什么值得总结的部分。...
View ArticleWHENEVER SQLERROR and WHENEVER OSERROR
WHENEVER OSERROR WHENEVER OSERROR {EXIT [SUCCESS|FAILURE|n|variable|:BindVariable] [COMMIT|ROLLBACK] |CONTINUE [COMMIT|ROLLBACK|NONE]} Performs the specified action (exits SQL*Plus by default) if an...
View Articlestate column of x$bh
0, FREE, no valid block image 1, XCUR, a current mode block, exclusive to this instance 2, SCUR, a current mode block, shared with other instances 3, CR, a consistent...
View Articleoracle数据文件BLOCK结构详解(转)
http://www.sosdb.com/article/datafile_block.htm datafile block block size :8192 Offset 0 1 2 3 4 5 6 7 8 9 a b c d e f 00014000 06 A2 00 00 0A 00 40 01 0E 89 43 00 00 00 05 02 type frmt...
View Article关于一致性读的几个知识点
http://blog.csdn.net/biti_rainy/article/details/34554 同一个BLOCK中的数据，只要有一条被更新，即使只查询没有被更新的数据,甚至通过索引直接由 ROWID 查询数据，我们可以想象为根本就不看被更新的数据一眼，但是，依然会产生 CR block CR并不是因为查看到的数据被更改过才去产生一致读，而是只要block里面存在活动事务、或者...
View Articleoracle row header
行头(row header)：用来存储该行中的列数，链接信息和行锁的状态 Oracle Database uses the row header to manage the row piece stored in the block. The row header contains information such as the following: Columns in the row piece...
View Articleoracle dbatabase blocks
http://www.adp-gmbh.ch/ora/concepts/db_block.html Free used and unused blocks Free blocks Free blocks are blocks below the high water mark whose filling is below the pctused attribute. If an insert...
View ArticleOracle Internals
from: http://www.ordba.net/Articles/OInternals.htm Oracle Internals- Part 1 The Study or knowledge of internal structures of Oracle is necessary for an advanced performance tuning and...
View ArticleSecure External Password Store
怎样在oracle rman 备份脚本中不写密码？怎样在应用程序连接中不写密码？ 每一个Oracle DBA 都有写脚本调度数据库相关任务的经验，经常需要在shell 脚本里连接数据库，可能最让你头疼的是你不得不在脚本里写上明文的用户名密码来连接数据库，例如： connect scott/tiger@test 此类，毫无疑问，这会带来安全隐患。如果你想避免这种安全隐患，一般你有两种方法：1。...
View ArticleORA-27369: job of type EXECUTABLE failed with exit code: 274662
When I try to use oracle scheduler job to run a rman backup scripts. then I got a error: 1 2 3 4 5 6 7 8 9 10 11 12 SQL> BEGIN 2 sys.dbms_scheduler.run_job(‘DAILY_BACKUP_LEVEL_0_JOB’); 3 end; 4 /...
View ArticleHow to get oracle cluster name?
Using following command can get the clustername 1 $CRS_HOME/bin/cemutlo -n You can refer to the commands in this script 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30...
View ArticleNow,For OCM
从今天开始准备OCM， 这周先把虚拟机环境搭建起来，然后从下周开始一个section，一个section的过，年底考试，这是今年很重要的一个目标，加油！
View Article深度解析ORA-00054: resource busy and acquire with NOWAIT specified
应该很多同学都碰到过ora-0054 error, 但你认真研究过它吗？很多同学会想当然的认为，要访问的资源（表或者索引或者其他）被锁了呗，这有什么好研究的？也不能说你错，但是具体情况你都了然了么？ 先来研究下这个错误的字面意思 ORA-00054: resource busy and acquire with NOWAIT specified...
View ArticleMaximizing SQL*Loader Performance
from:http://www.remote-dba.net/teas_rem_util18.htm Maximizing SQL*Loader Performance SQL*Loader Maximizing SQL*Loader Performance SQL*Loader is flexible and offers many options that should be...
View ArticleHow to skip SQL statements on logical standby database
Use DBMS_LOGSTDBY.SKIP procedure to skip tables that you do not want to apply to the logical standby database. Here are the lists of the types that can be skipped on logical standby database: DML or...
View ArticleUsing dbms_shared_pool.purge in 10.2.0.4
As you may know, we can use dbms_shared_pool.purge in 11g, but do you know that we can also use this procedure in 10.2.0.4. following is the steps: 1. create dbms_share_pool.purge procedure. SQL>...
View ArticleORA-39213: Metadata processing is not available
今天做expdp 导出的时候碰到一个ORA-39213的错误 ORA-39213: Metadata processing is not available 这个错误以前没有碰到过，文档上查询一下这个错误代码会有一个解决办法 39213, 00000, “Metadata processing is not available” // *Cause: The Data Pump could not...
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segment header
我们知道表空间的segment space管理方式有 FLM 和ASSM两种： 1. Free List Managed （FLM） FLM 2. Automatic Segment Space Managed（ASSM） ASSM 1 2 3 4 5 6 7 8 9 10 SQL> select...
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