statistics_level參數(shù)的介紹

statistics_level控制數(shù)據(jù)庫收集統(tǒng)計信息的級別，有三個參數(shù)值:

BASIC :收集基本的統(tǒng)計信息
TYPICAL：收集大部分統(tǒng)計信息(數(shù)據(jù)庫的默認(rèn)設(shè)置)
ALL：收集全部統(tǒng)計信息

[oracle@linuxoracle oracle]$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 - Production on Fri Nov 16 09:47:38 2007

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production

sys@DG1> desc v$statistics_level;
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
STATISTICS_NAME VARCHAR2(64)
DESCRIPTION VARCHAR2(4000)
SESSION_STATUS VARCHAR2(8)
SYSTEM_STATUS VARCHAR2(8)
ACTIVATION_LEVEL VARCHAR2(7)
STATISTICS_VIEW_NAME VARCHAR2(64)
SESSION_SETTABLE VARCHAR2(3)

sys@DG1> select STATISTICS_NAME,ACTIVATION_LEVEL,STATISTICS_VIEW_NAME from v$statistics_level;

STATISTICS_NAME ACTIVAT STATISTICS_VIEW_NAME
---------------------------------------- ------- ----------------------------------------------------------------
Buffer Cache Advice TYPICAL V$DB_CACHE_ADVICE
MTTR Advice TYPICAL V$MTTR_TARGET_ADVICE
Timed Statistics TYPICAL
Timed OS Statistics ALL
Segment Level Statistics TYPICAL V$SEGSTAT
PGA Advice TYPICAL V$PGA_TARGET_ADVICE
Plan Execution Statistics ALL V$SQL_PLAN_STATISTICS
Shared Pool Advice TYPICAL V$SHARED_POOL_ADVICE

8 rows selected.

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