>>>>> "Baruch" == Baruch Even <baruch.even@stripped> writes:
Baruch> Hello,
Baruch> I have a trouble with my program (PHP3 & MySQL) which is rather
Baruch> strange.
Baruch> I have in my program a sequence like that:
Baruch> I have a table clients, to update it (a lengthy process), I create a
Baruch> second table clients_update with reduced number of indexes and do the
Baruch> update on it, after that I create a new table clients_temp with full
Baruch> tables insert into from clients_update, then I drop the clients table,
Baruch> rename the clients_temp to clients and drop the clients_update table.
Baruch> Everything is working fine on MySQL 3.22.20 on Linux, now I transferred
Baruch> it to the ISP's system with 3.21.29-gamma on IRIX, and things don't
Baruch> work as expected, one instruction at a time everything works as
Baruch> expected, when I run the program and stop it after each command it
Baruch> seems to work perfectly but only until I do the alter after drop table.
Baruch> The drop alone works, when they are in sequence the clients table stays
Baruch> empty but the clients_temp is gone.
Baruch> I'm baffled as to the reason for this problem, I saw no mention of a
Baruch> bug like that in the changes list of MySQL between the versions.
Baruch> The commands I use are:
Baruch> CREATE TABLE CLIENTS_TEMP ( .. )
Baruch> INSERT INTO CLIENTS_TEMP SELECT * FROM CLIENTS_UPDATE
Baruch> DROP TABLE CLIENTS
Baruch> ALTER TABLE CLIENTS_TEMP rename as CLIENTS
Baruch> DROP TABLE CLIENTS_UPDATE
Baruch> (this are from my head but they are close enough).
Baruch> No error is emitted by MySQL for the commands and they just pass on.
Baruch> One thing worth mentioning is that I do all this when all three tables
Baruch> are locked for writing, and there is a 'GET LOCK "update"' also.
Baruch> I would appreciate any help.
Hi!
I think that 3.21.29 had a bug when you do a ALTER TABLE on a locked
table!
The fix is to not use locks, or upgrade to the latest 3.21 or the
latest 3.22 version.
Regards,
Monty
