FREEPOOLS integer:给LOG段指定free list.RAC环境下整数为实例的个数。单实例环境下为1.在自动undo模式下oracle默认采用 FREEPOOLS来管理空闲块列表。除非我们在表的存储配置中指定了freelist groups参数。 CACHE | NOCACHE | CACHE READS:指定lob块是否在数据库缓冲区中缓存。 索引lobindexname(TABLESPACE tablesapce...
Drop the primary key, keeping its index Build a unique constraint using this index This avoids having to recreate an index. On large tables this can be a huge time saver. Assuming the old primary key used a unique index (the default), duplicates are also prevented while you do this switch...
Index Rate this document: Language: nullnull How to Modify Direct Maps Log in as a user who has permissions to change the maps. Make your changes to the direct map. The specific steps needed to change the map depends on the name service that you are using. Notify your users of the...
IndexRate this document: Language: nullnull How to Modify the Master Map Log in as a user who has permissions to change the maps based on the name service that you are using. If you are using the local map files, assume the root role. Make your changes to the master map. The spe...
Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.4 [Release 11.2]: ORA-39126 and ORA-12838: cannot read/modify an object after modifying it in paral
Change Columnis not used in traditional RDBMS such as MySQL, Oracle, and SQL Server. In those environments, you can change the name of a column using theALTER TABLE RENAME COLUMNcommand, and you can change the data type of a column using theALTER TABLE MODIFY COLUMNcomnmand. ...
CREATE INDEX t1_created_date_idx ON t1(created_date); INSERT INTO t1 SELECT level, 'Description for ' || level, ADD_MONTHS(TO_DATE('01-JAN-2017', 'DD-MON-YYYY'), -TRUNC(DBMS_RANDOM.value(1,4)-1)*12) FROM dual CONNECT BY level <= 10000; ...
How to modify scan listener port in Oracle RAC . Below are the easy steps for modifying the scan listener port.
In Oracle mode, OceanBase Database allows you to create a unique index for a non-partitioned table. Example: Create a unique index obclient> CREATE TABLE test (c1 int PRIMARY KEY, c2 VARCHAR(50)); Query OK, 0 rows affected (0.04 sec) ...
There are some restrictions associated with this functionality. It can’t be used to partition an index-organized table (IOT). It can’t be used if the table has a domain index. You can only convert a table to a reference-partitioned child table in offline mode....