帶您了解DB2快照監(jiān)控
DB2快照監(jiān)控可能對(duì)于很多剛接觸DB2數(shù)據(jù)庫(kù)的新人來(lái)說(shuō)還比較陌生，下面就為你介紹DB2快照監(jiān)控的項(xiàng)等知識(shí)，供您參考學(xué)習(xí)之用。
DB2快照監(jiān)控的項(xiàng)：
Sorts： Number of heaps used, overflows, sorts performance， 【SORT】【 DFT_MON_SORT】
Locks： Number of locks held, number of deadlocks，【 LOCK】【 DFT_MON_LOCK】
Tables： Measure activity (rows read, rows written)，【 TABLE】【 DFT_MON_TABLE】
Bufferpools： Number of reads and writes, time taken，【 BUFFERPOOL】【 DFT_MON_BUFPOOL】
Unit of work： Start times, end times, completion status，【 UOW】【 DFT_MON_UOW】
SQL statements： Start time, stop time, statement identification，【 STATEMENT】【DFT_MON_STMT】
Timestamps： Monitors timestamp，【 TIMESTAMP】【 DFT_MON_TIMESTAMP】
通過(guò)下面兩個(gè)命令都可以打開(kāi)監(jiān)控項(xiàng)：
UPDATE DBM CONFIGURATION USING DFT_MON_STMT ON
修改該參數(shù)不需要重啟實(shí)例將起作用，它將作用于該實(shí)例中的每個(gè)數(shù)據(jù)庫(kù)（除過(guò)這幾個(gè)監(jiān)控參數(shù)外，其它對(duì)實(shí)例參數(shù)的修改需要重啟實(shí)例方生效）。
UPDATE MONITOR SWITCHES USING STATEMENT ON
該命令使該選項(xiàng)只在該會(huì)話中起作用，斷開(kāi)后將失效。
獲取監(jiān)控項(xiàng)快照的可用級(jí)別：
Database manager - Captures information for an active instance
Database - Captures database(s) information
Application - Captures application(s) information
Bufferpools - Captures buffer pool activity information
Table space - Captures information for table spaces within a database
Table - Captures information for tables within a database
Lock - Captures information for locks held by applications against a database
Dynamic SQL cache - Captures point-in-time statement information from the SQL statement cache for the database
查看監(jiān)控開(kāi)關(guān)：
GET MONITOR SWITCHES－－查看當(dāng)前會(huì)話的監(jiān)控設(shè)置
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