oracle awr报告生成与分析

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　　Automatic Workload Repository(AWR)是10g引入的一个重要组件。在里面存贮着近期一段时间内（默认是7天）数据库活动状态的详细信息。
　　
　　1、生成awr报告
　　
        以oracle用户登录
        sqlplus / as sysdba
        @?/rdbms/admin/awrrpt.sql


     2、分析报告
SQL ordered by Elapsed Time

• Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
  
• % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100
  

Elapsed Time (s)CPU Time (s)Executions Elap per Exec (s) % Total DB TimeSQL IdSQL ModuleSQL Text
         
Elapsed Time(S): SQL语句执行用总时长，此排序就是按照这个字段进行的。注意该时间不是单个SQL跑的时间，而是监控范围内SQL执行次数的总和时间。单位时间为秒。Elapsed Time = CPU Time + Wait TimeCPU Time(s): 为SQL语句执行时CPU占用时间总时长，此时间会小于等于Elapsed Time时间。单位时间为秒。
Executions: SQL语句在监控范围内的执行次数总计。
Elap per Exec(s): 执行一次SQL的平均时间。单位时间为秒。
% Total DB Time: 为SQL的Elapsed Time时间占数据库总时间的百分比。
SQL ID: SQL语句的ID编号，点击之后就能导航到下边的SQL详细列表中，点击IE的返回可以回到当前SQL ID的地方。
SQL Module: 显示该SQL是用什么方式连接到数据库执行的，如果是用SQL*Plus或者PL/SQL链接上来的那基本上都是有人在调试程序。一般用前台应用链接过来执行的sql该位置为空。
SQL Text:简单的sql提示，详细的需要点击SQL ID。

    SQL ordered by CPU Time

• Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
  
• % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100
  

CPU Time (s)Elapsed Time (s)Executions CPU per Exec (s)% Total DB TimeSQL IdSQL ModuleSQL Text


记录了执行占CPU时间总和时间最长的TOP SQL(注意是监控范围内该SQL的执行占CPU时间总和，而不是单次SQL执行时间)。


SQL ordered by Gets

• Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
  
• Total Buffer Gets: 964,486
  
• Captured SQL account for 103.6% of Total
  

Buffer Gets Executions Gets per Exec %TotalCPU Time (s)Elapsed Time (s)SQL IdSQL ModuleSQL Text


记录了执行占总buffer gets(逻辑IO)的TOP SQL(注意是监控范围内该SQL的执行占Gets总和，而不是单次SQL执行所占的Gets).


SQL ordered by Reads

• Total Disk Reads: 5,606
  
• Captured SQL account for 168.4% of Total
  

Physical ReadsExecutionsReads per Exec %TotalCPU Time (s)Elapsed Time (s)SQL IdSQL ModuleSQL Text


记录了执行占总磁盘物理读(物理IO)的TOP SQL(请注意是监控范围内该SQL的执行占磁盘物理读总和，而不是单次SQL执行所占的磁盘物理读)。


SQL ordered by Executions

• Total Executions: 20,124
  
• Captured SQL account for 59.3% of Total
  

Executions Rows ProcessedRows per ExecCPU per Exec (s)Elap per Exec (s) SQL IdSQL ModuleSQL Text


记录了按照SQL的执行次数排序的TOP SQL。该排序可以看出监控范围内的SQL执行次数。


SQL ordered by Parse Calls

• Total Parse Calls: 14,635
  
• Captured SQL account for 69.0% of Total
  

Parse CallsExecutions % Total ParsesSQL IdSQL ModuleSQL Text


记录了SQL的软解析次数的TOP SQL。




SQL ordered by Sharable Memory

• Only Statements with Sharable Memory greater than 1048576 are displayed
  

Sharable Mem (b)Executions % TotalSQL IdSQL ModuleSQL Text


记录了SQL占用library cache的大小的TOP SQL。Sharable Mem (b)：占用library cache的大小。单位是byte。
 
 
SQL ordered by Version Count

• Only Statements with Version Count greater than 20 are displayed
  

Version Count Executions SQL IdSQL ModuleSQL Text


记录了SQL的打开子游标的TOP SQL。