lately i have been seeing a lot of "CPU + Wait for CPU" as a wait in the sql performance issues i am handling...i see that even though CPU is only 50% utilized the wait event is still seen. what is it exactly and is there a way to reduce this wait ... Elapsed time of a s...
oracle是比较常见的字符方式读写硬盘。 字符设备还是块设备的定义属于操作系统的设备访问层,与实际物理设备的特性无必然联系。设备访问层下面是驱动程序,所以只要驱动程序提供的方式,都可以。 也就是说驱动程序支持stream方式,那么就可以用这种方式访问,驱动程序如果还支持block方式,那么你想用哪种方式访问都可以,典型的...
1)设置mysql的全局方法,设置完立刻重启mysql vim /etc/my.cnf [mysqld] interactive_timeout=1800 wait_timeout=1800 全局永久生效现在数据库中设置,在修改文件等需要重启数据库的时候在重启mysql set global interactive_timeout = 1800; set global wait_timeout =... ...
可以确认当时全时ON CPU, 从上图看负载是从16:58左右开始, 分析这类问题DASH是常用的分析工具,之前总结过ASH相关的BLOG《Know more about Oracle ASH》,前不久同事还问我ASH是何时从memory刷到disk中的, 1,默认AWR的快照间隔;2,如果ASH buffer 已满时MMNL进程都会负责这事。如果17:00 到 17:30的AWR 没有...
在每个计算节点上执行此过程,以在核心级别更改 CPU 和内存资源分配。 要确定您是否可以执行此过程,请参见 Supported Domain Configurations 。
resmgr:cpu quantumScheduler34.692.90 CPU + Wait for CPUCPU26.622.23 latch: library cacheConcurrency25.912.17 latch: shared poolConcurrency5.050.42 latch freeOther4.150.35 Top Event P1/P2/P3 Values Event% EventP1 Value, P2 Value, P3 Value% ActivityParameter 1Parameter 2Parameter 3 ...
.OracleConnection) at beans.ConnectionPool.getConnection(ConnectionPool.java:112) - locked <0xe0386580> (a java.util.Vector) - locked <0xe0375410> (a beans.ConnectionPool) at xxx.Cue_1700c.GetNationList(Cue_1700c.java:66) at org.apache.jsp.cue_1700c_jsp._jspService(cue_1700c_jsp.java...
Oracle Corporation io.netty.noUnsafe = true awt.toolkit = sun.awt.X11.XToolkit java.vm.info = mixed mode java.version = 1.8.0_151 java.ext.dirs = /usr/local/java/jre/lib/ext:/usr/java/packages/lib/ext sun.boot.class.path = /usr/local/java/jre/lib/resources.jar:/usr/local/java...
表C–66 CPU 使用情况特性 特性 说明 CPU Number CPU 号 % CPU Idle Time CPU 处于空闲模式的时间百分比 % CPU User Time CPU 处于用户模式的时间百分比 % CPU Kernel Time CPU 处于内核模式的时间百分比 % CPU Wait Time CPU 处于等待模式的时间百分比 % CPU Wait Time On I/O CPU ...
lately i have been seeing a lot of "CPU + Wait for CPU" as a wait in the sql performance issues i am handling...i see that even though CPU is only 50% utilized the wait event is still seen. what is it exactly and is there a way to reduce this wait ... Elapsed time of a s...