#explain

ORA-32342: The EXPLAIN_MVIEW facility failed to explain the materialized view statement

文档解释ORA-32342:TheEXPLAIN_MVIEWfacilityfailedtoexplainthematerializedviewstatementCause:Anerrorexistsinthematerializedviewdefinition.Asaresult,thematerializedvie...

ORA-32341: The EXPLAIN_MVIEW facility failed to explain the materialized view “string”.”string”

文档解释ORA-32341:TheEXPLAIN_MVIEWfacilityfailedtoexplainthematerializedview“string”.”string”Cause:Thedependentobject(s)ofthematerializedvie...

ORA-13781: cannot perform test-execute and explain plan operations on the automatic SQL tuning task

文档解释ORA-13781:cannotperformtest-executeandexplainplanoperationsontheautomaticSQLtuningtaskCause:Theuserattemptedtotest-executeorgenerateexplainplansforaSQLworkl...

ORA-32347: NULL capabilities during explain mview

文档解释ORA-32347:NULLcapabilitiesduringexplainmviewCause:Thesupplieddefiningquerydidnotgenerateanycapabilitiesinformation.Action:Replacethequerysinceitisnotsuitabl...

ORA-02401: cannot EXPLAIN view owned by another user

文档解释ORA-02401:cannotEXPLAINviewownedbyanotheruserCause:TheviewspecifiedintheSQLstatementbelongstoanotheruserandcannotbeexplained.Action:Createaviewwiththesamede...

ORA-30376: prevent sharing of a parsed query of an explain rewrite session

文档解释ORA-30376:preventsharingofaparsedqueryofanexplainrewritesessionCause:Explainrewritegeneratesasharedcursorafterparsingtheuserquery.Raisingthiserrorwillpreven...

ORA-02400: explain plan output buffer size limit exceeded

文档解释ORA-02400:explainplanoutputbuffersizelimitexceededCause:Internallythiserrorisraisedandcaughttohandlecaseswheretheplanoutputexceedstebuffersize.Theoutputistr...

MySQL Error number: 3598; Symbol: ER_WINDOW_EXPLAIN_JSON; SQLSTATE: HY000

文档解释Errornumber:3598;Symbol:ER_WINDOW_EXPLAIN_JSON;SQLSTATE:HY000Message:TogetinformationaboutwindowfunctionsuseEXPLAINFORMAT=JSON错误说明ER_WINDOW_EXPLAIN_JSON错误是M...
IT技术学习 ·2023-07-03

MySQL Error number: 3012; Symbol: ER_EXPLAIN_NOT_SUPPORTED; SQLSTATE: HY000

文档解释Errornumber:3012;Symbol:ER_EXPLAIN_NOT_SUPPORTED;SQLSTATE:HY000Message:EXPLAINFORCONNECTIONcommandissupportedonlyforSELECT/UPDATE/INSERT/DELETE/REPLACE:错误说明...
IT技术学习 ·2023-06-17

mysql explain(转)

explain显示了mysql如何使用索引来处理select和表连接转自http://blog.csdn.net/zhuxineli/article/details/14455029explain显示了MySQL如何使用索引来处理select语句以及连接表。可以帮助选择更好的索引和写出更优化的查询语句。先解析一条sql...
代码星球 ·2021-02-23

浅谈SQL优化入门:2、等值连接和EXPLAIN(MySQL)

在《MySQL必知必会》中对于等值连接有提到两种方式,第一种是直接在WHERE子句中规定如何关联即可,那么第二种则是使用INNERJOIN关键字。如下例两种方式是“等同”的。//WHERE方式SELECTvend_name,prod_name,prod_price,quantityFROMvendors,product...

MySql 性能优化神器 Explain

MySQL提供了一个EXPLAIN命令,它可以对 SELECT 语句进行分析,并输出 SELECT 执行的详细信息,以供开发人员针对性优化,explain是SQL优化中最常用的工具,搞定type和Extra,explain也就基本搞定了。EXPLAIN命令用法十分简单,在SELE...

[转]Oracle 执行计划(Explain Plan) 说明

原文地址:http://langgufu.iteye.com/blog/2158163如果要分析某条SQL的性能问题,通常我们要先看SQL的执行计划,看看SQL的每一步执行是否存在问题。 如果一条SQL平时执行的好好的,却有一天突然性能很差,如果排除了系统资源和阻塞的原因,那么基本可以断定是执行计划出了问题。...

MySQL的explain分析sql语句

explain分析查询使用 EXPLAIN 关键字可以模拟优化器执行SQL查询语句,从而知道MySQL是如何处理你的SQL语句的。这可以帮你分析你的查询语句或是表结构的性能瓶颈。通过explain命令可以得到: 表的读取顺序 数据读取操作的操作类型 哪些索引可以使用&n...

温故而知新-mysql的一些语法show,describe,explain,fulltext

1showshowtables;显示数据库的所有表showdatabases;显示所有数据库showcolumnsfromtable;显示表的所有列showgrantsforroot@localhost;查看当前用户的权限showindexfromtable;查看当前表定义的索引  2describ...
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