How To Move Or Rebuild A Lob Partition

How To Move Or Rebuild A Lob Partition [ID 761388.1]   

  修改时间 29-JUN-2010     类型 HOWTO     状态 MODERATED   

In this Document

  Goal

  Solution

  References

Platforms: 1-914CU;

This document is being delivered to you via Oracle Support's Rapid Visibility (RaV) process and therefore has not been subject to an independent technical review. 

Applies to:

Oracle Server - Enterprise Edition - Version: 9.2.0.8 to 11.1.0.7 - Release: 9.2 to 11.1

Information in this document applies to any platform.

Goal

How to move or rebuild a LOB partition since if use traditional syntax, it will fail.

SQL> alter table SHOW_LOB_STORAGE move lob(DDD)

  2  store as (tablespace PARTFORLOB03);

alter table SHOW_LOB_STORAGE move lob(DDD)

            *

ERROR at line 1:

ORA-14511: cannot perform operation on a partitioned object

Solution

The syntax to move a LOB partition is the following.

alter table <table name> move partition <table partition name>

lob (<lob column name>) store as <optional lob partition name> (tablespace <lob tablespace name>);

-or-

alter table <table name> move partition <table partition name>

lob (<lob column name>) store as (tablespace <lob tablespace name>); 

A working example.

SQL> connect testlob/testlob

Connected.

1. Create a partitioned table that contains a LOB.

SQL> create table show_lob_storage

  2  (aaa number(5),

  3   bbb varchar2(10),

  4   ccc number(5),

  5   ddd CLOB )

  6  PARTITION BY RANGE(aaa)

  7  (PARTITION p1 VALUES LESS THAN (50) tablespace part01

  8     LOB (ddd) STORE AS (tablespace partforlob01),

  9   PARTITION p2 VALUES LESS THAN (100) tablespace part02

 10     LOB (ddd) STORE AS (tablespace partforlob02),

 11   PARTITION p3 VALUES LESS THAN (MAXVALUE) tablespace part03

 12     LOB (ddd) STORE AS (tablespace partforlob03));

Table created.

2. Show objects created on DB from above SQL.

SQL> set pagesize 10000

SQL> col segment_name format a25

SQL> col segment_type format a16

SQL> col tablespace_name format a13

SQL> col partition_name format a15

SQL> select segment_name, segment_type, tablespace_name,

  2  partition_name from user_segments

  3  order by segment_name, partition_name;

SEGMENT_NAME              SEGMENT_TYPE     TABLESPACE_NA PARTITION_NAME

------------------------- ---------------- ------------- ---------------

SHOW_LOB_STORAGE          TABLE PARTITION  PART01        P1

SHOW_LOB_STORAGE          TABLE PARTITION  PART02        P2

SHOW_LOB_STORAGE          TABLE PARTITION  PART03        P3

SYS_IL0000054529C00004$$  INDEX PARTITION  PARTFORLOB01  SYS_IL_P150

SYS_IL0000054529C00004$$  INDEX PARTITION  PARTFORLOB02  SYS_IL_P151

SYS_IL0000054529C00004$$  INDEX PARTITION  PARTFORLOB03  SYS_IL_P152

SYS_LOB0000054529C00004$$ LOB PARTITION    PARTFORLOB01  SYS_LOB_P147

SYS_LOB0000054529C00004$$ LOB PARTITION    PARTFORLOB02  SYS_LOB_P148

SYS_LOB0000054529C00004$$ LOB PARTITION    PARTFORLOB03  SYS_LOB_P149

9 rows selected.

3. Show the partition name corresponding to each LOB partition.

SQL> select partition_name, lob_partition_name, tablespace_name

  2  from user_lob_partitions where table_name = 'SHOW_LOB_STORAGE'; 

PARTITION_NAME  LOB_PARTITION_NAME             TABLESPACE_NA

--------------- ------------------------------ -------------

P1              SYS_LOB_P147                   PARTFORLOB01

P2              SYS_LOB_P148                   PARTFORLOB02

P3              SYS_LOB_P149                   PARTFORLOB03

4. Move LOB partition SYS_LOB_P147 to tablespace PARTFORLOB3.

SQL> alter table SHOW_LOB_STORAGE move partition P1 tablespace PART01

  2  lob(DDD) store as SYS_LOB_P147 (tablespace PARTFORLOB03);  

Table altered.

5. Show location of LOB partition after the move.

SQL> select partition_name, lob_partition_name, tablespace_name

  2  from user_lob_partitions where table_name = 'SHOW_LOB_STORAGE';

PARTITION_NAME  LOB_PARTITION_NAME             TABLESPACE_NA

--------------- ------------------------------ -------------

P1              SYS_LOB_P147                   PARTFORLOB03

P2              SYS_LOB_P148                   PARTFORLOB02

P3              SYS_LOB_P149                   PARTFORLOB03

6. Show the LOB index partition followed the LOB partition to new tablespace.

SQL> select partition_name, tablespace_name, status from user_ind_partitions; 

PARTITION_NAME  TABLESPACE_NA STATUS

--------------- ------------- --------

SYS_IL_P151     PARTFORLOB02  USABLE

SYS_IL_P152     PARTFORLOB03  USABLE

SYS_IL_P154     PARTFORLOB03  USABLE

7. Syntax if just want to rebuild a LOB partition on the existing tablespace.

SQL> alter table SHOW_LOB_STORAGE move partition P2

  2  lob(DDD) store as (tablespace PARTFORLOB02);

Table altered.