前言
1. 一般信息
1.1. 关于本手册
1.2. 本手册采用的惯例
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flyinweb 's BLOG |
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一、实例信息 *sysconfig ————>; onconfig文件 *sysprofile ————>; 服务器统计信息 *syslog ————>; 逻辑日志 *sysvpprof ————>; 虚拟处理器 Exploring the Sysmaster Database by Lester Knutsen lester@advancedatatools.com When you list all the databases on your INFORMIX server, you will see one called "sysmaster". This is a special database and is one of the new features that first appeared in INFORMIX-OnLine DSA 6.x and 7.x. This is a database that contains tables that can be used for monitoring your system. These are referred to as the System Monitoring Interface (SMI) tables. In this chapter we will explore some of the tables and views that are in this database. The sysmaster database is described as a pseudo database. That means most of its tables are not normal tables on disk, but pointers to shared memory structures in the OnLine engine. The sysmaster database contains over 120 tables. Only 18 of these tables are documented in the INFORMIX-OnLine Dynamic Server Administrator's Guide, Volume 2, Chapter 38. The rest are undocumented and described by Informix as for internal use. The examples and references in this article are based on OnLine 7.23. I have also tested some of the examples with versions 7.10, 7.12, and 7.22. There are some minor changes between versions in the undocumented features and structures of these tables. Informix数据库对UTF8字符集的支持 随着企业信息化的不断快速发展,信息化的深度不断加大,越来越多的企业数据和信息需要使用数据库存储和管理,但是往往这些信息是建立在不同的平台之上,存储在不同的数据库产品之中,如此一来在数据交换过程中跨数据库的整体统一标准就成为了企业当务之急。 字符集问题即是这其中的一个。以金融行业为例,很多银行等金融机构,经过多年的信息化发展,建立了 环境:(产品,平台,机型,软件版本,等) 与具体的环境无关 问题描述: 当我们在向数据库表装载数据或插入数据的时候,需要对其插入的效率进行实时监控,例如:当前对这张表的插入效率如何,XX笔/秒,对索引空间的使用情况如何,XX页/秒。通过对这些具体数据的实时监控,我们可以对插入数据的方式、方法进行适时调整,以获得最佳的插入效率 Error 329 when connecting to a database from the secondary of a HDR pair Problem This article describes a known problem which causes error 329 when trying to connect to a database from the secondary of a HDR pair. vmplot.sh, a useful tool for MySQL performance tuning 这个工具其实就是把vmstat的输出结果变成可视化的曲线图而已。 首先执行类似 vmstat 1 200 > vmstat.out 这样的命令,收集一段时间的vmstat统计结果,然后交给vmplot脚本来处理即可。vmplot也只是个简单的shell脚本,利用gnuplot工具,向其传递相应的参数,就能划出你想要的PNG图片(/tmp目录下)。 Informix数据库日常维护脚本 检查各个dbspaces的空间使用状况: [code]select name dbspace,sum(chksize) allocated,sum(nfree) free,round(((sum(chksize)-sum(nfree))/sum(chksize))*100)||"%" pcused form sysdbspaces d,syschunks c |
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