CREATE TABLE event_table(event VARCHAR2(50),event_time DATE);CREATE OR REPLACE TRIGGER event_trigger AFTER STARTUP ON DATABASE BEGIN INSERT INTO event_table VALUES(ora_sysevent,sysdate); END; select * from event_table; 三、触发器的综合实例 Example:做一个日志用来记录scott用户的一些操作: 首先...
Example 9-1 Trigger Uses Conditional Predicates to Detect Triggering Statement(触发器使用条件谓词来检测触发语句) Example 9-13 Trigger Derives New Column Values(触发器派生新列值) Example 9-2 INSTEAD OF Trigger Example 12-10 FORALL Statement for ...
A trigger is a named PL/SQL block stored in the Oracle Database and executed automatically when a triggering event takes place. The event can be any of the following: A data manipulation language (DML) statement executed against a table e.g.,INSERT,UPDATE, orDELETE. For example, if you ...
Oracle Data Access Client (ODAC) 11.2 and later To connect with an on-premises Oracle database or Azure virtual machine with Oracle Database installed, you must install the on-premises data gateway. This gateway acts as a bridge and provides a secure data transfer between on-premises data and...
Oracle Data Access Client (ODAC) 11.2 and later To connect with an on-premises Oracle database or Azure virtual machine with Oracle Database installed, you must install the on-premises data gateway. This gateway acts as a bridge and provides a secure data transfer between on-premises data and...
Example: CREATE OR REPLACE TRIGGER before_shutdown BEFORE SHUTDOWN ON DATABASE BEGIN gather_system_stats; END; 注意:只有在正常关闭情况下,shutdown nomal或者shutdown immediate时触发,非正常关闭shutdown abort不能触发。 SERVERERROR 当数据库发生错误时触发。
■ Do not create recursive triggers. For example, do not create an AFTER UPDATE trigger that issues an UPDATE statement on the table on which the trigger is defined. The trigger fires recursively until it runs out of memory ■ Use DATABASE triggers judiciously. They fire every time any dat...
TheV$ASM_FILEviews'redundancy_loweredcolumn transitions from being unknown (U) to eitherYorNwhen the storage configuration of the diskgroup is changed. For example, when adding, dropping or resizing, the disks in the diskgroup will update all the files that are affected. The user can trigger the...
附录一: 给用户添加�导入数据权限的操作 第一, 启动sql*puls 第二,以system/manager登陆 第三,create user username IDENTIFIED BY password (假设已经创建过用户,这步能够省略) 第四,GRANT CREATE USER,DROP USER,ALTER USER ,CREATE ANY VIEW , DROP ANY VIEW,EXP_FULL_DATABASE,IMP_FULL_DATABASE, DBA...
Data control language (DCL) operations are not supported. Triggers cannot be synchronized or migrated during incremental data synchronization or migration. You must disable the triggers in the destination Oracle database. The data that has FOREIGN KEY constraints cannot be synchronized or migrated duri...