Oracle Enqueue Lock Type Reference including 11g new locks

内部视图x$ksqst记录了以enqueue type分类的队列管理统计信息(Enqueue management statistics by type),ksqstwat列反映了等待次数,而ksqstwtim列反映了累积等待时间,实际上v$enqueue_stat动态性能视图的CUM_WAIT_TIME列数据也来源于ksqstwtim:
SQL> select * from v$fixed_view_definition where view_name=upper('gv$enqueue_stat');

VIEW_NAME
------------------------------
VIEW_DEFINITION
--------------------------------------------------------------------------------
GV$ENQUEUE_STAT
select inst_id, ksqsttyp, sum(ksqstreq), sum(ksqstwat), sum(ksqstsgt),
 sum(ksqstfgt), sum(ksqstwtm)
    		

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