WOW Victoria, thats a good explanation. That makes many things clearer now. Thank you very much.
However, when not having the set the tmpdir variable were are the temporary tables stored ? (I searched the whole harddisc) I assume in this case that they must be stored in the memory, is that right ? Best regards Nils Valentin Tokyo/Japan 2003年 6月 25日 水曜日 19:17、Victoria Reznichenko さんは書きました: > "Nils Valentin" <[EMAIL PROTECTED]> wrote: > > I have some questions about temporary tables. I would appreciate any > > replies: > > > > I created a temporary table f.e. like this: > > > > mysql> create temporary table temp SELECT * FROM relations; > > Query OK, 4 rows affected (2.35 sec) > > Records: 4 Duplicates: 0 Warnings: 0 > > > > When I do > > > > mysql> show create table temp; > > > > Then it will give me this: > > | temp | CREATE TEMPORARY TABLE `temp` ( > > > > `member_id` int(16) NOT NULL default '0', > > `company_id` int(16) NOT NULL default '0', > > `membership_id` int(16) NOT NULL default '0' > > ) TYPE=MyISAM CHARSET=latin1 | > > > > > > Now what confuses me is that > > > > a) it says here TYPE=MyISAM > > Because MyISAM is default table type > > > b) I understood that only HEAP tables are stored in the memory. > > Yes. > > > I was assuming (until now) that HEAP tables are (the only one type of) > > temporary tables. > > Temporary tables may have type HEAP. > > > I tried > > > > CREATE TEMPORARY TABLE temp TYPE= InnoDB SELECT * FROM relations; > > or > > CREATE TEMPORARY TABLE temp TYPE= HEAP SELECT * FROM relations; > > > > and they are all created as in-memory tables no files are created. > > Can I use any table format (ISAM,MYISAM,BDB,InnoDB,HEAP) for temporary > > tables > > You can use MyISAM, ISAM, MERGE, HEAP, InnoDB. > Temporary table files are created in the temporary directory: > http://www.mysql.com/doc/en/Temporary_files.html > > > If, so what would be the difference between a temporary table in general > > and a HEAP table ? > > Temporary tables are the per-connection tables. > HEAP tables are stored in memory tables. > > > -- > For technical support contracts, goto https://order.mysql.com/?ref=ensita > This email is sponsored by Ensita.net http://www.ensita.net/ > __ ___ ___ ____ __ > / |/ /_ __/ __/ __ \/ / Victoria Reznichenko > / /|_/ / // /\ \/ /_/ / /__ [EMAIL PROTECTED] > /_/ /_/\_, /___/\___\_\___/ MySQL AB / Ensita.net > <___/ www.mysql.com -- --- Valentin Nils Internet Technology E-Mail: [EMAIL PROTECTED] URL: http://www.knowd.co.jp Personal URL: http://www.knowd.co.jp/staff/nils -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
