Database-exporter发布 感谢wucharles,一个充满Geek精神的小伙。
1.supports export database from each other. (you need write driver by yourself,now support oracle and MySQL) 2.supported database: Oracle, MySQL.(from oracle to mysql or mysql to oracle) 3.supports multi source tables merged into one target ta[......]
最近team基于mysql的性能基准测试,包含多种场景[……]
前天处理了一启RAC ASM 内存泄露问题，系统为公司最后一套RAC one node 版本为11.2.0.3
这套核心RAC one node系统出现大量 log file switch buffer busy waits等待,并伴随大量cursor: pin S wait on X read by other session。
SID USERNAME MACHINE EVENT PARAM W WT SQL[......]
[……]
MyAWR 开源了,第一版的reference 已经放出, tx to noodba
MyAWR_Reference_Guid
slideshare地址：MyAWR (awr of MySQL)
MyAWR template：MySQL WorkLoad Report[……]
根据Richard Foote的文章,做了如下验证：
Ref：Clustering Factor Calculation Improvement and provide some control over DBMS_STATS index clustering factor computation
[oracle@db-42 ~]$ unzip p13262857_112030_Generic.zip [oracle@db-42 ~]$ cd 13262857/ [oracle@db-42 13262857]$ ora si SQL*Plus: Release[......]
1.配合使用systemtap 监控系统对于文件的读写：
[root@db-42 systemtap]# uname -a Linux db-42 2.6.18-194.el5 #1 SMP Mon Mar 29 22:10:29 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
[root@db-42 systemtap]# more inodewatch.stp
#! /usr/bin/env stap
probe vfs.write, vfs.read
{
# dev and ino are defined by vfs.write[......]
noodba同学写的基于mysql的 WORKLOAD REPOSITORY工具,目前还没有开源 非常的给力！！
主要思想为一台管理机器,集中了所有client端的数据,client 为mysql database 使用host_id来区分 如 host_id=1代表mysql database 1,host_id=2 代表mysql database 2.
具体采集AWR过程如下：
[mysql@hadooptest2 myawr]$ perl myawrrpt.pl ===============================================[......]
systemtap发行版本提供了socktop,用于监控socket套接字之间的通信,具体如下：
[root@db-42 ~]# socktop -h
USAGE: socktop [-d] [-i interval] [-N num] [-P protocol]... [-f family]...
[-t stype]... [-n pname]... [-p pid]... [-u username]... [-h]
-d # print network device traffic (default: off)[......]
By wwf from ebay COC about Optimizer in Oracle 11g.
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