oracle SQL解析步骤小结

1 the syntax of the sql statement is verified.

sql的语法检查

2 the data dictionary is searched to verify table and column definitions.

从数据字典检查表名和字段名

3 the data dictionary is searched to verify security privileges on relevant objects.

从数据字典中检查权限

4 parse locks are acquired on the relevant objects.

解析相关对象的锁

5 the optimal execution plan is determined.

选在执行计划运行sql

6 the statement is loaded into the shared sql area (also known as the library cache) in the shared pool of the system global area (sga).

执行后sql语句放在sga的sql共享区