在Oracle数据库中,可以使用TRUNCATE TABLE ... PARTITION语句来清空特定分区的数据,而不会删除分区本身或影响其他分区的数据。 TRUNCATE TABLE PARTITION 的基本用法 TRUNCATE TABLE ... PARTITION语句的语法如下: sql TRUNCATE TABLE table_name PARTITION partition_name; 或者,如果你想在清空分区数据的同时更新全局索...
通过TRUNCATE PARTITION ... CASCADE命令,我们可以清空父表分区和子表分区。 ALTER TABLE t1 TRUNCATE PARTITION part_2014CASCADE UPDATE INDEXES; EXEC DBMS_STATS.gather_table_stats(USER,'t1'); EXEC DBMS_STATS.gather_table_stats(USER, 't2'); SELECT table_name, partition_name, num_rows FROM user_ta...
范围分区表是通过 create table 语句的 partition by range 子句来创建的,分区的范围通过 values less than 子句指定,其指定的是分区的上限(不包含),所有大于等于指定值的数据被分配至下一个分区,除了第一个分区,每个分区的下限即前一个分区的上限: create table members ( id number, name varchar2(32), creat...
通过TRUNCATE PARTITION ... CASCADE命令,我们可以清空父表分区和子表分区。 ALTER TABLE t1 TRUNCATE PARTITION part_2014CASCADE UPDATE INDEXES; EXEC DBMS_STATS.gather_table_stats(USER,'t1'); EXEC DBMS_STATS.gather_table_stats(USER, 't2'); SELECT table_name, partition_name, num_rows FROM user_ta...
一、TRUNCATE TABLE 语法 TRUNCATE TABLE [schema_name.]table_name [ PRESERVE MATERIALIZED VIEW LOG | PURGE MATERIALIZED VIEW LOG ] [ DROP STORAGE | REUSE STORAGE ] ; --下面仅列出reuse storage的说明部分 REUSE STORAGE Specify REUSE STORAGE to retain the space from the deleted rows allocated to th...
一、TRUNCATE TABLE 语法 TRUNCATE TABLE [schema_name.]table_name [ PRESERVE MATERIALIZED VIEW LOG | PURGE MATERIALIZED VIEW LOG ] [ DROP STORAGE | REUSE STORAGE ] ; --下面仅列出reuse storage的说明部分 REUSE STORAGE Specify REUSE STORAGE to retain the space from the deleted rows allocated to th...
SQL> alter table byst1.t1 enable row movement; Table altered. 之后重新开启OGG的REPLICATE进程,即可同步: 验证目标端分区中的数据: SQL> select * from byst1.t1 partition(t1_PART1); ID NAME AGE --- --- --- 1 a 18 2 a 18 ---修改后:...
is lost after a DDL operation modified the structure of tables. Using Flashback Table is not possible because a DDL was run on the tables between the desired point in time and the current time. Flashback Table cannot rewind tables through structural changes such as a truncate table operation....
表级同步支持alter table add column、alter table drop column、alter table rename column、alter table modify column以及truncate table的基本DDL,不支持默认值等的修改。 库级同步支持create table(表内定义不能包含函数)。 DDL中的对象不能是目标库的关键字,比如index,where等。
When altering a partitioned external table with theALTER TABLEstatement, the following clauses are not supported:MODIFY PARTITION,EXCHANGE PARTITION,MOVE PARTITION,MERGE PARTITIONS,SPLIT PARTITION,COALESCE PARTITION, andTRUNCATE PARTITION. Reference partitioning, automatic list partitioning, and interval partiti...