ITPub博客

首页 > Linux操作系统 > Linux操作系统 > Creating an Index Online

Creating an Index Online

原创 Linux操作系统 作者:tolywang 时间:2005-03-24 00:00:00 0 删除 编辑

http://www.itpub.net/showthread.php?threadid=336222&pagenumber=   

在线建立INDEX的文章 。
http://download-west.oracle.com/doc...ndexes.htm#3062




************************************************************************************

Creating an Index Online
Previously, when creating an index on a table there has always been a DML S-lock on that table during the index build operation, which meant you could not perform DML operations on the base table during the build.

Now, with the ever-increasing size of tables and necessity for continuous operations, you can create and rebuild indexes online--meaning you can update base tables at the same time you are building or rebuilding indexes on that table. Note, though, that there are still DML SS-locks, which means you cannot perform other DDL operations during an online index build.

The following statements perform online index build operations:

ALTER INDEX emp_name REBUILD ONLINE;

CREATE INDEX emp_name ON emp (mgr, emp1, emp2, emp3) ONLINE;


--------------------------------------------------------------------------------
Note:
While you can perform DML operations during an online index build, Oracle recommends that you do not perform major/large DML operations during this procedure. For example, if you wish to load rows that total up to 30% of the size of an existing table, you should perform this load before the online index build.

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

**************************************************************************************


 

 

When the ONLINE keyword is specified as a part of an ALTER INDEX or CREATE INDEX command, a temporary index-organized journal table is created to record changes made to the base table. This journal table is created in the same tablespace as the index being altered or created.
While the server process is rebuilding the index, other users can continue to access the old index structure. Any updates to the old index during the rebuild operation are recorded in the journal table.

所谓的journal table 就是:
ORA-08120: Need to create SYS.IND_ONLINE table in order to (re)build index
Cause: Alter index Build/Rebuild online require existing of SYS.IND_ONLINE table.
Action: User/DBA needs to create sys.ind_online before alter the index /rdbms/admin/catcio.sql contains script to create ind_online.

Online Index Rebuild (continued)
When the server process has completed the rebuild operation, it merges the changes entered
in the journal. This merge by which changed rows are incorporated into the new index is
done while the table is still online.
This is accomplished by scanning the journal table and operating on a per row basis.
Operations are committed every 20 rows. Locked rows are skipped. The Oracle server
process may make multiple passes over the journal table to process previously locked rows.

 

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

主题: Ora-8120 On Online Index Rebuild After 9.2.0.5 Upgrade
类型: PROBLEM
状态: MODERATED
内容类型: TEXT/X-HTML
创建日期: 31-MAR-2004
上次修订日期: 12-MAY-2004


The information in this article applies to:
Oracle Server - Enterprise Edition - Version: 9.2.0.5
This problem can occur on any platform.

Errors
ORA-8120
RFA-1304

Symptoms
You have applied the 9205 patchset and when you try to rebuild an index online, you receive the following error:

ORA-08120: Need to create SYS.IND_ONLINE$ table in order to (re)build index
Changes
A new table, SYS.IND_ONLINE$, was created in the 9205 patchset that is referenced to relieve the performance related issues that are caused when rebuilding an index online. When rebuilding an index online, this table is updated, however, this table does not exist in the dictionary for 9205. Please note that this is NEW to 9205
Fix
Log into the database as the SYSDBA user and run the following script from ORACLE_HOME/rdbms/admin

% @catcio.sql


References

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

 

catcio.sql中的内容如下:
SET ECHO ON
SET FEEDBACK 1
SET NUMWIDTH 10
SET LINESIZE 80
SET TRIMSPOOL ON
SET TAB OFF
SET PAGESIZE 100

create table ind_online$
( obj# number not null,
type# number not null, /* what kind of index is this? */
/* normal : 1 */
/* bitmap : 2 */
/* cluster : 3 */
/* iot - top : 4 */
/* iot - nested : 5 */
/* secondary : 6 */
/* ansi : 7 */
/* lob : 8 */
/* cooperative index method : 9 */
flags number not null
/* index is being online built : 0x100 */
/* index is being online rebuilt : 0x200 */
)
/


实际上是在Oracle建库时,没有调用catcio.sql,也可算是个BUG吧.自已手动创建一下此表就行了.

 

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/35489/viewspace-84313/,如需转载,请注明出处,否则将追究法律责任。

请登录后发表评论 登录
全部评论
Oracle , MySQL, SAP IQ, SAP HANA, PostgreSQL, Tableau 技术讨论,希望在这里一起分享知识,讨论技术,畅谈人生 。

注册时间:2007-12-10

  • 博文量
    5595
  • 访问量
    13384469