选在执行计划运行SQL

解析相关对象的锁


3 The data dictionary is searched to verify security privileges on relevant objects.
执行后SQL语句放在SGA的SQL共享区


5 The optimal execution plan is determined.

1 The syntax of the SQL statement is verified.
2 The data dictionary is searched to verify table and column definitions.
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).
SQL的语法检查
从数据字典检查表名和字段名
4 Parse locks are acquired on the relevant objects.



从数据字典中检查权限