Oracle和MySQL - 博客园

Script:列出用户表空间的定额

摘要：以下脚本用于列出用户表空间的使用量和定额:PROMPT Print the details of the Users Tablespace QuotasTTITLE left _date center ' Database Users Space Quotas by Tablespace' skip 2 Quotas by Tablespace"COL un format a25... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(168) 评论(0) 推荐(0)

利用ProcDump工具诊断Windows平台上的Oracle数据库性能

摘要： ProcDump与Procexp一样是Windows平台上的内部调试工具，Procexp采用图形界面体现系统整体及个别进程的性能信息，而ProcDump则与我们在Unix平台上使用的性能分析工具类似使用CLI命令行界面。Procdump目前的版本号为3.04，可以从其Homepage上下载到该工具，该监控软件由Mark Russinovich开发，是一款Free Software。其官方介绍如下:... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(327) 评论(0) 推荐(0)

Restore Production Database to Development Platform A step-by-step example

摘要： Overview of setup and configuration Oracle Enterprise Edition 11gR2. 11.2.0.1.0 Linux RH5 NetBackup 6.5.5 Identical environments: Identical versions of Oracle. Same ORACLE_HOME and ORACLE_BASE. The ar... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(123) 评论(0) 推荐(0)

Library Cache Hit Ratio

摘要： The library cache (a component of the shared pool) stores the executable (parsed or compiled) form of recently referenced SQL and PL/SQL code. Oracle tries to reuse this code. If the code has been exe... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(210) 评论(0) 推荐(0)

PX Deq: Execute Reply等待事件

摘要： Occurs when the query coordinator is waiting for a response from a parallel slave. This is normally considered an idle event, but can cause excessive CPU in some cases. SolutionReduce the degree of ... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(468) 评论(0) 推荐(0)

PX Deq: Execution Msg等待事件

摘要： Occurs when a parallel slave is waiting to be told what to do. This is normally considered an idle event, but can cause excessive CPU in some cases. SolutionReduce the degree of parallelism in the q... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(512) 评论(0) 推荐(0)

PX Deq: Table Q Normal等待事件

摘要： Occurs when a parallel slave is waiting for data from another slave. Investigate why the other slaves are not sending data fast enough. This is normally considered an idle event, but can cause excessi... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(880) 评论(0) 推荐(0)

PX qref latch等待事件

摘要： Contention caused by communication between parallel query processes. SolutionsDecrease the degree of parallelism for the queriesTune the parallel_execution_message_size parameter (may require larger... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(255) 评论(0) 推荐(0)

Reduce the Number of SQL Statements

摘要： Shareable SQL uses bind variables rather than literal values. If an application makes use of literal (unshared) SQL then this can severely limit scalability and throughput. The cost of parsing a new S... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(132) 评论(0) 推荐(0)

Round-Trip Time

摘要： Round-trip time when running "select 1 from dual" (includes network time but not connect time) on this database. SolutionIf this is high, contact your network administrator to understand network lat... 阅读全文

posted @ 2013-03-19 00:47 Oracle和MySQL 阅读(240) 评论(0) 推荐(0)

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