oracle SQL解析步驟小結

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.

從資料字典檢查表名和欄位名

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

從資料字典中檢查許可權

4 Parse locks are acquired on the relevant objects.

解析相關對象的鎖

5 The optimal execution plan is determined.

選在執行計畫運行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).

執行後SQL語句放在SGA的SQL共用區