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oracle SQL解析步骤小结

发布时间:2018-11-09 09:44 作者:918Õ 来源:AG集团 点击: 字号:

1 The syntax of the 918博天堂网址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

http://www.bkjia.com/oracle/339670.htmlwww.bkjia.comtruehttp://www.bkjia.com/oracle/339670.htmlTechArticle1 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...

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