Truncate process
reduce to initial value from table size before 11.2 versiyon.
New feature of truncate is
drop all storage. This sytax reduce to zero from size table.
#Only truncate process:
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SQL*Plus: Release 11.2.0.2.0 Production on Mon Dec 5 16:17:19 2011
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> set linesize 1000
SQL> create table muratk_dba.truncate_table as select * from scott.emp;
Table created.
SQL> select sum(bytes)/1024/1024 from dba_segments where segment_name ='TRUNCATE_TABLE';
SUM(BYTES)/1024/1024
--------------------
.0625
SQL> truncate table muratk_dba.truncate_table;
Table truncated.
SQL> select sum(bytes)/1024/1024 from dba_segments where segment_name ='TRUNCATE_TABLE';
SUM(BYTES)/1024/1024
--------------------
.0625
# Truncate process with drop all storage feature
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SQL> drop table muratk_dba.truncate_table purge;
Table dropped.
SQL> create table muratk_dba.truncate_table as select * from scott.emp;
Table created.
SQL> select sum(bytes)/1024/1024 from dba_segments where segment_name ='TRUNCATE_TABLE';
SUM(BYTES)/1024/1024
--------------------
.0625
SQL> truncate table muratk_dba.truncate_table drop all storage;
Table truncated.
SQL> select sum(bytes)/1024/1024 from dba_segments where segment_name ='TRUNCATE_TABLE';
SUM(BYTES)/1024/1024
--------------------
SQL> drop table muratk_dba.truncate_table purge;
Table dropped.
