一、ASH 颗粒度最细最常用的诊断工具,通常当问题刚发生时,即可立即根据生成的ash报告诊断问题 下文示例为当问题出现后,查看最近5分钟的性能报告,运行ashrpt脚本后,其他选项直接默认跳过,在Enter value for begin_time选项中填写"-5" SQL>@ashrptCurrentInstance~~~DBIdDBNameInstNumInstance---1506959389ORCL1orclSpec...
Report duration specified:Using25-Jul-1823:48:39asreportbegintimeUsing25-Jul-1823:53:41asreportendtimeSpecify Slot Width (usingashrpti.sql)for'Activity Over Time'section~~~-- Explanation:-- In the 'Activity Over Time' section of the ASH report,-- the analysis period is divided into smaller...
gc current block 2-way 18 0.13 08:15:00 (5.0 min) 505 CPU + Wait for CPU 251 1.76 db file sequential read 117 0.82 enq: TX - row lock contention 42 0.29 08:20:00 (5.0 min) 632 CPU + Wait for CPU 299 2.10 db file sequential read 142 1.00 gc cr grant 2-way 39 0.27 08:25...
1.远程上去看了下,任务管理器能看到的CPU使用率一直100%,其它内存磁盘等使用正常;登陆数据库查看等待事件主要是cursor: mutex S;又检查切了下归档、做检查点/alert日志等看看均正常,马上17点了,收集了一小时AWR,ASH收的时候报错就没拿到; 2.AWR 分析如下: Snap Id Snap Time Sessions Cursors/Session Begin Sna...
ash-4.3#sh syno-i686-bootstrap_1.2-7_i686.xsh Optware Bootstrap for syno-i686. Extracting archive... please wait bootstrap/ bootstrap/bootstrap.sh bootstrap/ipkg-opt.ipk 1216+1 records in 1216+1 records out 249302 bytes (249 kB) copied, 0.0066538 s, 37.5 MB/s ...
Qualcomm cannot command the extremely exorbitant ransom for flagship SoC, it still remains flagship but it doesn't take a genius (did I bring a follower in?) to realise that phone manufacturers have MORE options. Months before I did say wait and see, nobody waited and nobody saw, look wh...
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...
Or 2. Kill MMON SLAVE from os. The sid and serial number can be obtained from ASH report. If there are multiple MMON slaves, kill all slaves.
Gulftown sticks toRonak’s 2MB of L3 per core ruleand has a full, 12MB shared L3 cache that’s accessible by any or all of the six cores. It’s actually because of the large unified L3 cache that performance in applications that don’t use all six cores can be higher than quad-core...
Oracle already reports CPU in % used and in centi-seconds used. I like to transform this into Average Active Sessions on CPU so I can compare it to my main way of showing ASH data which is Average Active Sessions on “ON CPU” which includes wait for CPU. ...