OCM_Session1_8_Schema Statistics and Parameter File Configuration

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8. Schema Statistics and Parameter File Configuration 8.1 Compute statistics for the various schemas in the database as necessary for use with cost based optimization. 8.2 Investigate the parameter file for reasonable sizes for each parameter listed. Add additional parameters as you deem necessary to support an optimal database environment. In addition,modify or add the following listed parameters:      UTL_FILE_DIR=('/home/oracle','/home/oracle/temp','/home/oracle/scripts')      Note: Applications that use Oracle 10g features will be running therefore,ensure the database and instance are appropriately configured.

参考联机文档：PL/SQL Packages and Types Reference ==> 103 DBMS_STATS ==>GATHER_DATABASE_STATS Procedureshttp://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_stats.htm#CIHEHDFB

• 8.1收集资料
  
• 8.1 Compute statistics for the various schemas in the database as necessary for use with cost based optimization.不同schema收集资料
  

SQL> begin  2  DBMS_STATS.GATHER_DATABASE_STATS(degree=>3); 这里的3表示并发的操作，也可以指定其他数字  3  end;  4  /
PL/SQL procedure successfully completed.

• 8.2修改参数
  
• 8.2 Investigate the parameter file for reasonable sizes for each parameter listed. Add additional parameters as you deem necessary to support an optimal database environment.In addition,modify or add the following listed parameters:修改或添加下列参数
  
•       UTL_FILE_DIR=('/home/oracle','/home/oracle/temp','/home/oracle/scripts')
  
•       Note: Applications that use Oracle 10g features will be running therefore,ensure the database and instance are appropriately configured.
  

[oracle@ocm1 Disk1]$ cd /home/oracle/[oracle@ocm1 ~]$ mkdir temp[oracle@ocm1 ~]$ lltotal 8drwxr-xr-x 2 oracle oinstall 4096 Mar 19 14:22 scriptsdrwxr-xr-x 2 oracle oinstall 4096 Mar 19 14:51 temp
此处注意题干给的有括号，而操作时没有括号SQL> alter system set utl_file_dir='/home/oracle','/home/oracle/temp','/home/oracle/scripts' scope=spfile;
System altered.
SQL> shutdown immediate;Database closed.Database dismounted.ORACLE instance shut down.SQL> startupORACLE instance started.
Total System Global Area  524288000 bytesFixed Size                  1220360 bytesVariable Size             163578104 bytesDatabase Buffers          356515840 bytesRedo Buffers                2973696 bytesDatabase mounted.Database opened.

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