v$event_histogram视图显示等待时间段以及在这期间会话等待某一特定事件--在这个例子中就是事务锁争用--的次数。 例如,会话等待少于4096毫秒(ms)的事件共162次。WAIT_COUNT列值之和为162.v$event_histogram视图显示, 大多数等待发生在4096毫秒的事件上,这就充分证明了该应用程序正在经历锁的争用问题,如果视图显示等...
V$SQL_WORKAREA_HISTOGRAM V$SSTABLE V$SYSSTAT V$SYSTEM_EVENT V$TIMEZONE_NAMES V$TENANT_MEMORY_INFO V$VERSION GV$OB_DTL_INTERM_RESULT_MONITOR V$OB_DTL_INTERM_RESULT_MONITOR V$GLOBALCONTEXT GV$OB_SESSION V$OB_SESSION 常见统计事件说明 常见等待事件说明 错误码(MySQL 模式) 常用内部表 错误码(Oracle 模...
Those wait events are only defined while the process is waiting; after the wait is over, they are reclassified according to the outcome of the global cache operation. They should appear only on the following views: V$SESSION_WAIT, V$ACTIVE_SESSION_HISTORY, V$EVENT_HISTOGRAM. gc cr request gc...
NAME: wait/synch/mutex/sql/hashfilo::lock COUNT_STAR: 69 SUM_TIMER_WAIT: 16848828 MIN_TIMER_WAIT: 0 AVG_TIMER_WAIT: 244185 MAX_TIMER_WAIT: 735345 ... Each wait event summary table has one or more grouping columns to how the table aggregates events. Event names refer to names of...
Allowed values for this property are: “AWRDB_SET”, “AWRDB_SNAPSHOT_RANGE_SET”, “AWRDB_SNAPSHOT_SET”, “AWRDB_METRICS_SET”, “AWRDB_SYSSTAT_SET”, “AWRDB_TOP_EVENT_SET”, “AWRDB_EVENT_SET”, “AWRDB_EVENT_HISTOGRAM”, “AWRDB_DB_PARAMETER_SET...
V$SYSTEM_EVENT(*) V$SYSTEM_WAIT_CLASS(10G新增) V$SESSION_WAIT_CLASS(10G新增) V$SESSION_WAIT_HISTORY(10G新增) V$EVENT_HISTOGRAM(10G新增) V$ACTIVE_SESSION_HISTORY(10G新增) 对这些视图的查询往往是反复的,可以使用扩展SQL Trace功能将这些信息抓取到trace文件中,然后用tkprof工具分析。
2019-12-16 15:40 −伴随pga的自动功能调整,Oracle引入了pga的优化视图,V$pga_target_advice和V$pga_target_advice_histogram. sql在工作区中以3种发式执行 optimal:指所有处理可以在内存完成 onepass:大部分可以在内存完成,但是需要使用磁盘操作 m... ...
The maximum value of the histogram. Double getMinValue() The minimum value of the histogram. String getName() The required single value query parameter to filter the entity name. Integer getNumBucket() The number of buckets within the histogram. String getOpcNamedCredential...
Currently available data sources and connectors: SystemTap, Oracle wait event interface histograms, BPF/bcc, NetApp C-mode performance counters, DTrace, Oracle AWR event histogram data, Oracle 10046 trace data. For each of them example scripts are provided. More data sources may be added in futu...
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