oracle SQL 解析 步驟，愛好oracle的朋友可以參考下，了解工作流程。
1 The syntax of the SQL statement is verified.
SQL的語法檢查
2 The data dictionary is searched to verify table and column definitions.
從數據字典檢查表名和字段名
3 The data dictionary is searched to verify security privileges on relevant objects.
從數據字典中檢查權限
4 Parse locks are acquired on the relevant objects.
解析相關對象的鎖
5 The optimal execution plan is determined.
選在執行計劃運行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).
執行后SQL語句放在SGA的SQL共享區
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