SQL SERVER的锁机制（二）概述（锁的兼容性与可以锁定的资源）-Mysql Tutorial-php.cn

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SQL SERVER的锁机制（二）概述（锁的兼容性与可以锁定的资源）

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Jun 07, 2016 pm 05:44 PM

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接上SQL SERVER的锁机制（一）概述（锁的种类与范围）二、完整的锁兼容性矩阵(见下图) 对上图的是代码说明：见下图。三、下表列出了数据库引擎可以锁定的资源。名称资源缩写编码呈现锁定时，描述该资源的方式说明数据行 RID RID 9 文件编号：分页编

接上SQL SERVER的锁机制（一）——概述（锁的种类与范围）

二、完整的锁兼容性矩阵(见下图)

对上图的是代码说明：见下图。

三、下表列出了数据库引擎可以锁定的资源。

名称

资源

缩写

编码

呈现锁定时，描述该资源的方式

说明

数据行

RID

文件编号：分页编号：Slot编号

用于锁定堆中的单个行的行标识符。

索引键

KEY

6字节哈希值

索引中用于保护可序列化事务中的键范围的行锁。

分页

PAGE

PAG

文件编号：分页编号

数据库中的 8 KB 页，虚拟主机，例如数据页或索引页。

范围

EXTENT

EXT

文件编号：范围的第一个分页的编号

一组连续的八页，香港服务器，例如数据页或索引页。

HoBT

数据表

TABLE

TAB

包括所有数据和索引的整个表。

文件

FILE

FIL

文件编号

数据库文件。

应用程序

APPLICATION

APP

6字节哈希值

应用程序专用的资源。

METADATA

元数据锁。

ALLOCATION_UNIT

分配单元。

数据库

DATABASE

数据库代码（DBID字段）

整个数据库。

索引

IDX

Db_id:object_id:index_id相关的其他资源

索引中的数据行锁定，免备案空间，

下面我们来看一个示例。

( tempdb..sysobjects type ) ##temp(spid int,dbid int ,objid int,indid int,type varchar(3),resource varchar(20) ,mode varchar(20),status varchar(5)) WBK_PDE_head wbook_no#spid,数据库(objid), 索引=(select name from sysindexes where ID=OBJID and indid=t.indid ), TYPE,resource,mode,status dbid,objid,indid spid,数据库(objid), 索引OBJID and index_id=t.indid ), TYPE,resource,mode,status dbid,objid,indid

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