Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
Oracle Database need not verify thata cursor is in the cache because it cannot be deallocated while an applicationcursor associated with it is open.
示例7 Fetching Data with Cursor Variables This example uses one cursor variable to do what Example 6 does with two explicit cursors. The first OPEN FOR statement includes the query itself. The second OPEN FOR statement references a variable whose value is a query. DECLAREcv SYS_REFCURSOR;-- c...
The best practice is to write sharable SQL and use the default of EXACT for CURSOR_SHARING. However, for applications with many similar statements, setting CURSOR_SHARING can significantly improve cursor sharing, resulting in reduced memory usage, faster parses, and reduced latch contention. Consider...
首先，我有一个返回ref_cursor的过程Oracle存储过程: CREATE OR REPLACE PROCEDURE getcity ( city...
一、Oracle数据库实例、用户、目录及session会话查看: 1、ORACLE SID查看设置 查看SID、用户名 $ env|grep SID 、select * from v$instance、select instance_name,host_name from v$instance; 查看数据库所有用户及用户状态: SQL> select usernames,account_status from dba_users; ...
A partial update may be performed only with Cursor.putCurrent. A null or partial DatabaseEntry output parameter may also be used in other cases, for example, to retrieve a partial key item. However, in practice this has limited value since the entire key is usually needed by the ...
双下划线前缀在 Python 中具有特殊含义,因为该语言实际上不允许您声明私有变量(类中一切皆为公有),从而增加了变量的访问难度:变量是通过 _Class__Member 语法(上例中的 _HR__db 和 _HR_cursor)公开的。同时,我们在该类中声明 __enter__ 和 __exit__ 方法,这样我们可以使用WITH 语句,在 WITH 代码块结束...
The text changes into a text cursor. Creating and Managing Reports 3-17 Editing Reports 2. Enter the report title. The title is saved with the report. You can edit the report title by clicking the title text field and typing. You can format the report title in the Report Properties ...
Only allows statements with identical text to share the same cursor. --只有SQL 语句完全相同的情况下,才会使用相同的cursor,即执行计划。 Notes: (1)If you set CURSOR_SHARING, then Oracle recommends the FORCE setting unless you are in a DSS environment. FORCE limits the growth of child cursors ...