INSERT操作在插入或更新记录时,检查到 duplicate key或者有一个被标记删除的duplicate key(本文的案例),对于普通的INSERT/UPDATE,会加LOCK_S属性锁next-key lock。而对于类似REPLACE INTO或者INSERT … ON DUPLICATE这样的SQL加的是X锁。而针对不同的索引类型也有所不同: 代码位置 row0ins.cc:2013 if (flags & ...
http://netfork.spaces.live.com/blog/cns!CB0D48877FFBC3B5!251.entry 在SQL Server 中使用DELETE和UPDATE的INNER JOIN关键字与 Access 的常规写法不同。 Access中写为: delete from t1 inner join t2 on t1.id = t2.tid 而SQL Server中须写为: delete from t1from t1inner join t2 on t1.id = t2...
SQL>selectINST_ID,sid,serial#,USERNAME,STATUS,MACHINE,SQL_ID,EVENT,(sysdate-LOGON_TIME)*86400as"s",LAST_CALL_ET fromgv$sessionwherestatus='ACTIVE'and usernameisnotnull; INST_ID SID SERIAL# USERNAME STATUS MACHINE SQL_ID EVENT--- --- --- --- --- --- --- ---159751393CXPT ACTIVE ...
-- -- SQL语句一 使用 EXISTS -- select customerid, companyname from customers as A where country = 'Spain' and not exists ( select * from orders as B where A.customerid = B.customerid ); -- -- SQL语句二 使用 IN -- select customerid, companyname from customers as A where country...
entry_date date, job varchar(40), salary double, resume text ); 2. 查看表 查看表结构:desctabName 查看当前数据库中所有表:showtables 查看当前数据库表建表语句 showcreate tabletabName; 3. 修改表 altertable tablenameadd/modify /drop/character set/change 列名 列类型 ...
问题和分析 mysql从库延迟太大, SQL线程和IO线程都是Running的, 但延迟有5天左右. SQL线程状态为:applying batch of row changes (delete) 解析相关relay log得到正在执行的事务信息 代码语言:javascript 代码运行次数:0 mysqlbinlog-vvv--base64-output=decode-row relay.xxxxx--start-position|more ...
1>CSC : error CS5001: Program does not contain a static 'Main' method suitable for an entry point 2 Methods same signature but different return types 255 character limit OleDB C# - Inconsistent results 2D Array read from Text file 2D array to CSV C# steamwriter 3 dimensional list in C# ...
class CRoySchedRs : public CADORecordBinding { BEGIN_ADO_BINDING(CRoySchedRs) // Column empid is the 1st field in the recordset ADO_VARIABLE_LENGTH_ENTRY2(1, adVarChar, m_sz_titleid, sizeof(m_sz_titleid), lemp_titleidStatus, TRUE) ADO_VARIABLE_LENGTH_ENTRY2(2, adInteger, m_sz_l...
arc asmcmd: entry 'arch_795194241_2_150.arc' does not exist in directory '+REV/GOBO4/ARCHIVELOG/' # 在A节点上再次切换一次 SQL> alter system switch logfile; System altered. SQL> select inst_id,name,count(*) from gv$archived_log group by inst_id,name; INST_ID NAME COUNT(*) --- ...
Namespace: Microsoft.VisualStudio.Data.Tools.Package Assembly: Microsoft.VisualStudio.Data.Tools.Package (in Microsoft.VisualStudio.Data.Tools.Package.dll)SyntaxC# Copy public static Icon DeleteEntry { get; } Property ValueType: System.Drawing..::..Icon...