OCM_Session1_8_Schema Statistics and Parameter File Configuration

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 Procedures

http://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 ~]$ ll

total 8

drwxr-xr-x 2 oracle oinstall 4096 Mar 19 14:22 scripts

drwxr-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> startup

ORACLE instance started.

Total System Global Area  524288000 bytes

Fixed Size                  1220360 bytes

Variable Size             163578104 bytes

Database Buffers          356515840 bytes

Redo Buffers                2973696 bytes

Database mounted.

Database opened.