Hi:
Oracle 8173 on Sun Solaris 2.8.
I am running a program that creates and drops tables repeatedly in a schema.
The table dropping part looks like this:
drop table ypd.t1 cascade constraints;
drop table ypd.t2 cascade constraints;
drop table ypd.t3 cascade constraints;
drop table ypd.t4 cascade constraints;
....
I thought I might be able to use "truncate table ..." and then "drop table
..." to make this process a bit faster. However the tests I did today showed
otherwise:
SQL> select bytes from dba_segments where segment_name='SEQUENCE';
BYTES
----------
1949810688
SQL> create table ypd_owner.SEQUENCE1
2 tablespace ypd nologging as select * from mt.SEQUENCE;
Table created.
Elapsed: 00:04:272.50
SQL> drop table ypd_owner.SEQUENCE1;
Table dropped.
Elapsed: 00:00:05.19
SQL> create table ypd_owner.SEQUENCE1
2 tablespace ypd nologging as select * from mt.SEQUENCE;
Table created.
Elapsed: 00:04:275.85
SQL> truncate table ypd_owner.SEQUENCE1;
Table truncated.
Elapsed: 00:00:06.99
SQL> drop table ypd_owner.SEQUENCE1;
Table dropped.
Elapsed: 00:00:00.70
-----------
Tablspace ypd is LMT. Similar test on smaller table showed the same result
"drop table ..." is faster than "truncate table ...". Any explanation?
TIA.
Guang
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