How do I turn on row movement in Oracle?

To enable row movement on a table:

1. Connect Oracle Recovery Manager (RMAN) to the target database as described in “Connecting to the Target Database Using RMAN.”
2. Enable row movement for all the objects that you want to rewind using Flashback Table. The following command enables row movement for the hr. employees table.

What is shrink space in Oracle?

Oracle Segment Shrink Space feature was introduced from Oracle database version 10g. It is used for reclaiming unused/fragmented space from database objects like table, index-organized table (IOT), index, partition, sub-partition, materialized view or materialized view log.

How do I shrink a table in Oracle?

Row Movement The ALTER TABLE SHRINK SPACE command moves rows between existing blocks to compact the data, so before you attempt to shrink a table segment you need to enable row movement. You can check if row movement is already enabled by querying the ROW_MOVEMENT column of the [DBA|ALL|USER]_TABLES views.

How do you shrink a lob?

Drop the new tablespace.

1. Identify the lob segment that needs to shrink.
2. Try online shrink the table or move the column to the same tablespace or a new tablespace TEMP.
3. Move the CLOB segment to another tablespace (in this example TEMP tablespace) and move back.

What does it mean to enable row movement in Oracle?

When you add the clause “enable row movement” to a create table statement, you are granting permission to Oracle to change the ROWID’s. It basically enables rows to move. If table is already created, you can enable row movement by using below command.

How to enable row movement in Flashback Table?

Enable row movement for all the objects that you want to rewind using Flashback Table. The following command enables row movement for the hr.employees table. For this example, you must also enable row movement on the tables hr.jobs and hr.departments.

Why do rows move around in an oracle table?

If you think about it, shrinking a table may entail moving data around within a table (handled internally by Oracle), so the idea of a row moving around makes sense. First, let’s get a record of the current ROWIDs for each office and then delete two rows.

What does row movement mean on a table?

Before you can use Flashback Table, you must ensure that row movement is enabled on the table to be flashed back, or returned to a previous state. Row movement indicates that rowids will change after the flashback occurs.