Oracle analyze table的使用总结

analyze table 一般可以指定分析： 表，所有字段，所有索引字段，所有索引。 若不指定则全部都分析。

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;

SQL> analyze table my_table compute statistics;

等价于：

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，可以删除分析数据：

SQL> analyze table my_table delete statistics;

SQL> analyze table my_table delete statistics for table for all indexes for all indexed columns;

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