DELETE TABLE xx do not erase index file after a vacuum full ?
Bug or problem with PostgreSQL ?
version
---------------------------------------------------------------
PostgreSQL 7.4.3 on i686-pc-linux-gnu, compiled by GCC 2.95.4
select * from my_table;
id | login | passwd | state | email
--------------+-----------+------------+-------+------------------
(0 rows)
I had before about 800 000 lines inside ...
I have done a :
DELETE from my_table;
Now If I look at the data/bases/ folder I see that I still have a 35 Mb file
for one of the index of this table ... ???
VACUUM FULL VERBOSE ANALYSE; have been done on this table before, but I still
have for this index this message :
INFO: index "email_my_table_key" now contains 2 row versions in 4313 pages
DETAIL: 0 index row versions were removed.
4309 index pages have been deleted, 4309 are currently reusable.
CPU 0.01s/0.01u sec elapsed 0.02 sec.
What happend ? Why the index file is still here ?
Thanks for your help !
--
Hervￜ Piedvache
Elma Ingï¿œnierie Informatique
6 rue du Faubourg Saint-Honorￜ
F-75008 - Paris - France
Pho. 33-144949901
Fax. 33-144949902
=?iso-8859-15?q?Herv=E9_Piedvache?= <herve@elma.fr> writes:
I have done a :
DELETE from my_table;
TRUNCATE would serve you a lot better.
For major reductions in table size VACUUM FULL is not the best tool;
you really want to reconstruct the indexes from scratch. Consider
REINDEX, CLUSTER, or (in this case) TRUNCATE.
regards, tom lane
Tom,
Le jeudi 1 Juillet 2004 19:22, Tom Lane a ï¿œcrit :
=?iso-8859-15?q?Herv=E9_Piedvache?= <herve@elma.fr> writes:
I have done a :
DELETE from my_table;TRUNCATE would serve you a lot better.
Impossible for this table because it's used by another table with a
referential integrity ... so truncate is refused ...
For major reductions in table size VACUUM FULL is not the best tool;
you really want to reconstruct the indexes from scratch. Consider
REINDEX, CLUSTER, or (in this case) TRUNCATE.
OK Thanks REINDEX is perfect ! ;o)
regards,
--
Hervￜ Piedvache
Elma Ingï¿œnierie Informatique
6 rue du Faubourg Saint-Honorￜ
F-75008 - Paris - France
Pho. 33-144949901
Fax. 33-144949902