oracle SQL解析步骤小结

答案：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

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