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[学习教程] MSSQL教程之split命令支解分区的办法

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冷月葬花魂 该用户已被删除
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发表于 2015-1-16 22:38:07 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式

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用一个库#bak_database存放这些历史数据。
SQL>selectPARTITIONEDfromdba_tableswheretable_name=LYTUSAGE;

PAR
---
YES


SQL>selectPARTITION_NAME,HIGH_VALUEfromdba_tab_partitionswhereTABLE_NAME=LYTUSAGE;

PARTITION_NAMEHIGH_VALUE
--------------------------------------------------------------------------------------------------------------
LYTUSAGE_200401TO_DATE(2004-02-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200402TO_DATE(2004-03-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200403TO_DATE(2004-04-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200404TO_DATE(2004-05-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200405TO_DATE(2004-06-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200406TO_DATE(2004-07-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200407TO_DATE(2004-08-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200408TO_DATE(2004-09-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200409TO_DATE(2004-10-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200410TO_DATE(2004-11-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200411TO_DATE(2004-12-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200412TO_DATE(2005-01-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200501TO_DATE(2005-02-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200502TO_DATE(2005-03-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200503TO_DATE(2005-04-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200504TO_DATE(2005-05-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200505TO_DATE(2005-06-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200506TO_DATE(2005-07-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200507TO_DATE(2005-08-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200508TO_DATE(2005-09-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200509TO_DATE(2005-10-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200510TO_DATE(2005-11-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200511TO_DATE(2005-12-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200512TO_DATE(2006-01-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA

24rowsselected.

删除2005年1月和2月的分区:
SQL>altertablelytusagedroppartitionLYTUSAGE_200501;

Tablealtered.

SQL>altertablelytusagedroppartitionLYTUSAGE_200502;

Tablealtered.

SQL>selectPARTITION_NAME,HIGH_VALUE,TABLESPACE_NAMEfromdba_tab_partitionswheretable_name=LYTUSAGE;

PARTITION_NAMEHIGH_VALUE
--------------------------------------------------------------------------------------------------------------
TABLESPACE_NAME
------------------------------

LYTUSAGE_200401TO_DATE(2004-02-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200402TO_DATE(2004-03-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200403TO_DATE(2004-04-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200404TO_DATE(2004-05-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200405TO_DATE(2004-06-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200406TO_DATE(2004-07-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200407TO_DATE(2004-08-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200408TO_DATE(2004-09-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200409TO_DATE(2004-10-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200410TO_DATE(2004-11-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200411TO_DATE(2004-12-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200412TO_DATE(2005-01-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200503TO_DATE(2005-04-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200504TO_DATE(2005-05-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200505TO_DATE(2005-06-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200506TO_DATE(2005-07-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200507TO_DATE(2005-08-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200508TO_DATE(2005-09-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200509TO_DATE(2005-10-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200510TO_DATE(2005-11-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200511TO_DATE(2005-12-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS

LYTUSAGE_200512TO_DATE(2006-01-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
WACOS


22rowsselected.


SQL>ALTERTABLELYTUSAGE
SPLITPARTITIONLYTUSAGE_200503AT(TO_DATE(2005-03-0100:00:00,SYYYY-MM-DDHH24:MI:SS))
INTO(partitionLYTUSAGE_200502tablespacewacos,partitionLYTUSAGE_200503tablespacewacos)UPDATEGLOBALINDEXES;

Tablealtered.

SQL>ALTERTABLELYTUSAGE
SPLITPARTITIONLYTUSAGE_200502AT(TO_DATE(2005-02-0100:00:00,SYYYY-MM-DDHH24:MI:SS))
INTO(partitionLYTUSAGE_200501tablespacewacos,partitionLYTUSAGE_200502tablespacewacos)UPDATEGLOBALINDEXES;

Tablealtered.

PARTITION_NAMEHIGH_VALUE
--------------------------------------------------------------------------------------------------------------
LYTUSAGE_200412TO_DATE(2005-01-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200401TO_DATE(2004-02-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200402TO_DATE(2004-03-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200403TO_DATE(2004-04-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200404TO_DATE(2004-05-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200405TO_DATE(2004-06-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200406TO_DATE(2004-07-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200407TO_DATE(2004-08-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200408TO_DATE(2004-09-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200409TO_DATE(2004-10-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200410TO_DATE(2004-11-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200411TO_DATE(2004-12-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200503TO_DATE(2005-04-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200504TO_DATE(2005-05-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200505TO_DATE(2005-06-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200506TO_DATE(2005-07-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200507TO_DATE(2005-08-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200508TO_DATE(2005-09-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200509TO_DATE(2005-10-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200510TO_DATE(2005-11-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200511TO_DATE(2005-12-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200512TO_DATE(2006-01-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200501TO_DATE(2005-02-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA
LYTUSAGE_200502TO_DATE(2005-03-0100:00:00,SYYYY-MM-DDHH24:MI:SS,NLS_CALENDAR=GREGORIA

24rowsselected.

SQL>altertablelytusagedroppartitionLYTUSAGE_200511;

Tablealtered.

SQL>altertablelytusagedroppartitionLYTUSAGE_200512;

Tablealtered.

SQL>ALTERTABLELYTUSAGEADDPARTITIONLYTUSAGE_200511
VALUESLESSTHAN(TO_DATE(2005-12-0100:00:00,SYYYY-MM-DDHH24:MI:SS))
TABLESPACEwacos
STORAGE(
INITIAL1M
NEXT10M
MINEXTENTS1
MAXEXTENTSunlimited
PCTINCREASE0)
PCTFREE5
PCTUSED95
NOLOGGING;

Tablealtered.

ALTERTABLELYTUSAGEADDPARTITIONLYTUSAGE_200512
VALUESLESSTHAN(TO_DATE(2006-01-0100:00:00,SYYYY-MM-DDHH24:MI:SS))
TABLESPACEwacos
STORAGE(
INITIAL1M
NEXT10M
MINEXTENTS1
MAXEXTENTSunlimited
PCTINCREASE0)
PCTFREE5
PCTUSED95
NOLOGGING;

Tablealtered.

优化的SQL查询算法,有效地提高查询速度
灵魂腐蚀 该用户已被删除
沙发
发表于 2015-1-19 19:50:24 | 只看该作者
不过话说回来了,绝大多数的性能优化准则与对sqlserver存储的结构理解息息相关
因胸联盟 该用户已被删除
板凳
发表于 2015-1-25 18:09:19 | 只看该作者
现在是在考虑:如果写到服务器端,我一下搞他个10个存储过程导过去,那久之服务器不就成垃圾箱了吗?即便优化了我的中间层.
兰色精灵 该用户已被删除
地板
发表于 2015-2-3 12:39:50 | 只看该作者
无法深入到数据库系统层面去了解和探究
小女巫 该用户已被删除
5#
发表于 2015-2-9 00:46:12 | 只看该作者
其实可以做一下类比,Oracle等数据库产品老早就支持了java编程,而且提供了java池参数作为用户配置接口。但是现在有哪些系统大批使用了java存储过程?!连Oracle自己的应用都不用为什么?!
金色的骷髅 该用户已被删除
6#
发表于 2015-2-26 15:52:24 | 只看该作者
多加的系统视图和实时系统信息这些东西对DBA挑优非常有帮助,但是感觉粒度还是不太细。
柔情似水 该用户已被删除
7#
发表于 2015-3-8 15:50:33 | 只看该作者
如果处理少量数据,比如几百条记录的数据,我不知道这两种情况哪个效率更高,如果处理大量数据呢?比如有表中有20万条记录.
莫相离 该用户已被删除
8#
发表于 2015-3-16 03:49:19 | 只看该作者
我是新手,正在学习数据库和操作系统,深感理论的泛广,唯有一步一步来,但是又感觉时间不够,收集了很多资料却总是没能认真的看完,希望有一个讨论板块,大家共同解决,共同分享,共同努力
分手快乐 该用户已被删除
9#
发表于 2015-3-22 19:35:09 | 只看该作者
对于数据库来说,查询是数据库的灵魂,那么SQL查询效率究竟效率如何呢?下文将带对SQL查询的相关问题进行讨论,供您参考。
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