analyze table 一般可以指定分析: 表,所有欄位,所有索引欄位,所有索引。 若不指定則全部都分析。
SQL> analyze table my_table compute statistics;
SQL> analyze table my_table compute statistics for table for all indexes for all columns;
SQL> analyze table my_table compute statistics for table for all indexes for all indexed columns;
其中:
SQL> analyze table my_table compute statistics;
等價於:
SQL> analyze table my_table compute statistics for table for all indexes for all columns;
sample:
analyze table t1 compute statistics for table;
analyze table t2 compute statistics for all columns;
analyze table t3 compute statistics for all indexed columns;
analyze table t5 compute statistics for all indexes;
analyze table t4 compute statistics; (不指定)
另外,可以刪除分析資料:
SQL> analyze table my_table delete statistics;
SQL> analyze table my_table delete statistics for table for all indexes for all indexed columns;
摘自:http://www.cnblogs.com/einyboy/archive/2012/08/09/2630321.html