举 个例子来说,当创建一个表:PT_SCHE_DETAIL时,ORACLE就会为这个对象分配一个段.在这个段中,即使未插入任何记录,也至少有一个区被 分配,第一个区的第一个块就称为段头(SEGMENT HEADE),段头中就储存了一些信息,基中HWM的信息就存储在此.此时,因为第一个区的第一块用于存储段头的一些信息,虽然没有存储任何...
CREATE OR REPLACE PROCEDURE PRO_TRUNC_DROP_LHR(COMMAND IN VARCHAR2, O_TYPE IN VARCHAR2, OWNER IN VARCHAR2, O_NAME IN VARCHAR2) AUTHID DEFINER AS V_SQL VARCHAR2(4000); BEGIN IF UPPER(COMMAND) IN ('DROP', 'TRUNCATE') AND UPPER(O_TYPE) IN ('TABLE', 'INDEX') THEN V_SQL := COMM...
`TRUNCATE` 是 MySQL 中的一个 SQL 命令,用于快速删除表中的所有数据,但不删除表本身。这个命令比 `DELETE` 更快,因为它不会记录单个行的删除操作,也不会触发任何删除触发器。...
// *Action: Before performing the above operations the table, disable the // foreign key constraints in other tables. You can see what // constraints are referencing a table by issuing the following // command: // SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam"; 比较清楚地说明...
// foreign key constraints in other tables. You can see what // constraints are referencing a table by issuing the following // command: // SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam"; 含义是当存在主外键约束关系的时候,外键关系启用的时候,不能对主表进行drop和truncate操作。如...
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Action:Check the syntax of the command and retry the operation specifying either TRUNCATE CLUSTER or TRUNCATE TABLE. ORA-03291: invalid truncate option - missing STORAGE keyword Cause:The STORAGE keyword was not specified with the DROP or REUSE options of the TRUNCATE command. ...
TRUNCATE statement: This command is used to delete all the rows from the table and free the space containing the table.SQL DROP Statement:The SQL DROP command is used to remove an object from the database. If you drop a table, all the rows in the table is deleted and the table ...
GETTRUNCATESandIGNORETRUNCATESare supported by Replicat for Oracle Database, SQL Server, DB2 LUW, DB2 z/OS, MySQL, and other ODBC targets that support theTRUNCATEcommand. Note: It is not possible to ignoreTRUNCATEs during capture from a DB2 z/OS database. By default,TRUNCATEs are always ...
Oracle中的delete、truncate和drop 2019-12-05 15:04 −Oracle中的delete、truncate和drop(1)delete语句执行删除的过程是每次从表中删除一行,并且同时将该行的删除操作 作为事务记录在日志中保存以便进行进行回滚操作。truncate则... 清欢QQ 0 2370 mysql之drop、truncate和delete的区别 ...