How do I move LOB data to another tablespace?

How do I move LOB data to another tablespace?

Move Lob Segment to Another Tablespace in Oracle You can move any lob segment to another tablespace as follows. ALTER TABLE OWNER. TABLE_NAME MOVE LOB(LOB_COLUMN) STORE AS (TABLESPACE NEW_TABLESPACE_NAME);

How do you shrink a LOB segment in Oracle?

— Shrink a LOB segment (basicfile only). ALTER TABLE table_name MODIFY LOB(lob_column) (SHRINK SPACE); ALTER TABLE table_name MODIFY LOB(lob_column) (SHRINK SPACE CASCADE); — Shrink an IOT overflow segment. ALTER TABLE iot_name OVERFLOW SHRINK SPACE; There is more detail about this functionality below.

Where are LOBs stored in Oracle?

table column
Only the LOB locator is stored in the table column; BLOB and CLOB data can be stored in separate tablespaces and BFILE data is stored as an external file. For inline LOBs, the database will store LOBs that are less than approximately 4000 bytes of data in the table column.

What is Oracle Pctversion?

PCTVERSION is the percentage of all used LOB data space that can be occupied by old versions of LOB data pages. As soon as old versions of LOB data pages start to occupy more than the PCTVERSION amount of used LOB space, Oracle tries to reclaim the old versions and reuse them.

How do you rebuild a LOB index?

Commands to rebuild Index, Partitioned Index, LOB Index, IOT (Index Organized Table)

1. To rebuild the partitioned index: set pagesize 1000.
2. To rebuild the LOB index: select ‘alter table ‘||owner||’.’||table_name||’ move tablespace TARGET_TABLESPACE ‘||chr(10)||
3. To rebuild the index organized table index (IOT):

How do you reclaim space from a LOB segment?

Reclaim unused rows by running the following command: ALTER TABLE SHRINK SPACE; Reclaim unused LOB columns by running the following command: ALTER TABLE MODIFY LOB () (SHRINK SPACE);

How do you shrink a LOB?

How to Shrink (make less sparse) a LOB (BASICFILE or SECUREFILE)? (Doc ID 1451124.1)

1. ALTER TABLE … SHRINK SPACE.
2. DBMS_REDEFINITION.
3. ALTER TABLE … MOVE.
4. EXPORT / DROP THE TABLE / IMPORT.
5. Add / Drop columns.

What are database LOBs?

Large Objects (LOBs) are a set of datatypes that are designed to hold large amounts of data. A LOB can hold up to a maximum size ranging from 8 terabytes to 128 terabytes depending on how your database is configured. Storing data in LOBs enables you to access and manipulate the data efficiently in your application.

What is the difference between CLOB and Nclob?

The primary difference between these types is that the CLOB type uses 1 byte per character to store characters in the ASCII character set while the NCLOB type uses 2 or 3 bytes per character to store characters in the Unicode character set. The BLOB (Binary Large Object) type can store data in binary format.

What happens when we drop tablespace?

Use the DROP TABLESPACE statement to remove a tablespace from the database. When you drop a tablespace, Oracle Database does not place it in the recycle bin. Therefore, you cannot subsequently either purge or undrop the tablespace. You must have the DROP TABLESPACE system privilege.

How do I drop an Oracle database including datafiles?

Steps To Drop Oracle Database Manually

1. Step 1 : Connect to the database with sysdba privilege. $ export ORACLE_SID=mydb $ sqlplus “/ as sysdba”
2. Step 2 : Shutdown the database. SQL> shutdown immediate;
3. Step 3: Start the Database in Exclusive mode.
4. Step 4: Drop the database.
5. Step 5 : Post Change Steps.

How to move lob segment to another tablespace?

Move Lob Segment to Another Tablespace in Oracle You can move any lob segment to another tablespace as follows. ALTER TABLE OWNER.TABLE_NAME MOVE LOB (LOB_COLUMN) STORE AS (TABLESPACE NEW_TABLESPACE_NAME); You can generate the moving scripts for lob segments as follows.

Is there a way to move the lob but not the table?

There does not seem to be a way to move the lob but not the table as well. It is: alter table t modify lob (y) store as ( tablespace lrg_tbl01) ^^^^^^ that does NOT Yes, but… the point being that MOVE does not move the table along with the lob.

Can a lob column be split in two tablespaces?

There is ONE column, so Oracle cannot split this column in two tablespaces, it is possible only for a table; lob columns in a tablespace and other columns in another tablespace. One thing, I don’t understand why when you insert a varchar2 data in your table, there is a row in user_lobs. You used anydata.convertVarchar2, it is not a lob.

Is there a way to shrink an oracle table?

So, if you have 5000 rows of some lob data, and you delete them from the table, then insert the same 5000 rows, you will have 10000 rows of consumed space. That could be done easily with shrinking the table but the default tablespace segment space management (SSM) on oracle 10g is manual, so it does not allow row movement and table shrinking.