sql 解释执行计划

sql 解释执行计划

//oracle解释执行计划
SQL> explain plan for select t.* from abin1 t where t.id<200;

 

Explained

 

SQL> select * from table(dbms_xplan.display);

 

PLAN_TABLE_OUTPUT

--------------------------------------------------------------------------------

Plan hash value: 1270356885

---------------------------------------------------------------------------

| Id  | Operation         | Name  | Rows  | Bytes | Cost (%CPU)| Time     |

---------------------------------------------------------------------------

|   0 | SELECT STATEMENT  |       |    98 |  1862 |     2   (0)| 00:00:01 |

|*  1 |  TABLE ACCESS FULL| ABIN1 |    98 |  1862 |     2   (0)| 00:00:01 |

---------------------------------------------------------------------------

Predicate Information (identified by operation id):

---------------------------------------------------

   1 - filter("T"."ID"<200)

 

13 rows selected

 

SQL> 


//mysql解释执行计划

explain select t.* from user_rest t where id<>8 

//oracle收集表的统计信息

analyze table abin1 compute statistics;