Oracle 統計信息收集
阿新 • • 發佈:2018-05-28
統計信息DBMS_STATS.GATHER_TABLE_STATS (
ownname VARCHAR2,
tabname VARCHAR2,
partname VARCHAR2 DEFAULT NULL,
estimate_percent NUMBER
block_sample BOOLEAN DEFAULT FALSE,
method_opt VARCHAR2
degree NUMBER
granularity VARCHAR2
cascade BOOLEAN
stattab VARCHAR2 DEFAULT NULL,
statid VARCHAR2 DEFAULT NULL,
statown VARCHAR2 DEFAULT NULL,
no_invalidate BOOLEAN DEFAULT,
stattype VARCHAR2 DEFAULT ‘DATA‘,
force BOOLEAN DEFAULT FALSE); 5.granularity: 統計數據的收集,‘ALL‘ - 收集所有(子分區,分區和全局)統計信息
statid VARCHAR2 DEFAULT NULL,
options VARCHAR2 DEFAULT ‘GATHER‘,
objlist OUT ObjectTab,
statown VARCHAR2 DEFAULT NULL,
no_invalidate BOOLEAN
force BOOLEAN DEFAULT FALSE,
obj_filter_list ObjectTab DEFAULT NULL);
ownname VARCHAR2,
tabname VARCHAR2,
partname VARCHAR2 DEFAULT NULL,
estimate_percent NUMBER
block_sample BOOLEAN DEFAULT FALSE,
method_opt VARCHAR2
degree NUMBER
granularity VARCHAR2
cascade BOOLEAN
stattab VARCHAR2 DEFAULT NULL,
statown VARCHAR2 DEFAULT NULL,
no_invalidate BOOLEAN DEFAULT,
stattype VARCHAR2 DEFAULT ‘DATA‘,
force BOOLEAN DEFAULT FALSE);
1.estimate_percent: 采樣百分比,有效範圍為[0.000001,100]
2.block_sample:使用隨機塊采樣代替隨機行采樣
3.cascade:是否收集此表索引的統計信息
4.degree:並行處理的cpu數量
DBMS_STATS.GATHER_SCHEMA_STATS (
ownname VARCHAR2
estimate_percent NUMBER
block_sample BOOLEAN DEFAULT FALSE,
method_opt VARCHAR2
degree NUMBER
granularity VARCHAR2
cascade BOOLEAN
stattab VARCHAR2 DEFAULT NULL,
options VARCHAR2 DEFAULT ‘GATHER‘,
objlist OUT ObjectTab,
statown VARCHAR2 DEFAULT NULL,
no_invalidate BOOLEAN
force BOOLEAN DEFAULT FALSE,
obj_filter_list ObjectTab DEFAULT NULL);
待續:後續會做對應參數的解釋,以及使用場景
http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_stats.htm#ARPLS68582
Oracle 統計信息收集