What error message, if any is thrown when someone attempts to log in when the two queries are running? Is the system as a whole performing slowly? What version of MySQL are you running?
>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< On 3/2/04, 1:37:34 PM, Bernd Jagla <[EMAIL PROTECTED]> wrote regarding Re: no one can log on any more: > table: text_data > type: ALL > possible_keys: NULL > key: NULL > key_len: NULL > ref: NULL > rows 133856002 > Extra: Using where > No temp tables created, no i/o problem, no swapping. > B > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: "Bernd Jagla" <[EMAIL PROTECTED]> > Cc: "mysql" <[EMAIL PROTECTED]> > Sent: Tuesday, March 02, 2004 2:34 PM > Subject: Re: no one can log on any more > Can you post the explain plan? I would be interested to see if temp table > tables are being created or if the system is swapping or if the the temp > tables are so large that the entire system begins to act poorly. > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > On 3/2/04, 12:35:20 PM, Bernd Jagla <[EMAIL PROTECTED]> wrote regarding Re: > no one can log on any more: > > There are no indices on the new table. > > Top looks normal: approx 100-150% usage (out of 800% [8 cpus]) > > There is no major i/o problem: sar -d says that less than 2% of io are > used. > > The only problems in this direction might be connected with memory and > the > > associated parameters in mysql. > > The file system cache is 5GB. I hope this is no problem. mysqld uses > about > > 54619 K (gmemusage) > > Top shows the actual size as 1794M and Res=1609 > > The problem only occurs when I do two similar queries at the same time. > Both > > queries access the same table for read (not write). Might this be the > > problem? How would I solve this one? > > Bernd > > ----- Original Message ----- > > From: <[EMAIL PROTECTED]> > > To: "Bernd Jagla" <[EMAIL PROTECTED]> > > Cc: "mysql" <[EMAIL PROTECTED]> > > Sent: Tuesday, March 02, 2004 1:17 PM > > Subject: Re: no one can log on any more > > When the queries in question are running, what does top look like? With > > an insert that large it may be beneficial to disable any keys that may be > > active on the target table and re-enable them after the data has been > > loaded. > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > On 3/2/04, 12:08:05 PM, Bernd Jagla <[EMAIL PROTECTED]> wrote regarding Re: > > no one can log on any more: > > > An explain on the select statements reveals that no index is used and > > that > > > all 133856002 rows are searched. > > > Do you think that using a new index would make much of difference? > > > I think it has something to do with some system/mysql parameters that > can > > be > > > adjusted. > > > I also don't understand why no one else can log on to the mysql system. > > > If you or someone could explain or point me to a documentation on this > it > > > would be pretty close to what I want. > > > Thanks for your help > > > Bernd > > > ----- Original Message ----- > > > From: <[EMAIL PROTECTED]> > > > To: "Bernd Jagla" <[EMAIL PROTECTED]> > > > Cc: "mysql" <[EMAIL PROTECTED]> > > > Sent: Tuesday, March 02, 2004 1:02 PM > > > Subject: Re: no one can log on any more > > > What does the explain plan reveal? > > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > > On 3/2/04, 9:05:17 AM, Bernd Jagla <[EMAIL PROTECTED]> wrote regarding no > > > one can log on any more: > > > > Hi there, > > > > I have some weird sql statements that seem to eat up all resources > from > > > > mysqld. > > > > Once I have two of them running at the same time no one can log on any > > > > more. Simple queries involving distinct get a out of memory error. > > > > We have tried changing the index buffer size from 256M to 2G, no > change. > > > > We have 7G of memory on an IRIX system with 8 cpus. > > > > No replication. > > > > Do you have any idea what is happening? > > > > Thanks a lot > > > > Bernd > > > > the sql statements look like this: > > > > insert into rule2 > > > > select id > > > > from text_uniq_bin > > > > where (substring(rev_rep,1,1)="1") AND > > > > ( > > > > substring(replaced,1,1) + > > > > substring(replaced,2,1) + > > > > substring(replaced,3,1) + > > > > substring(replaced,4,1) + > > > > substring(replaced,5,1) + > > > > substring(replaced,6,1) + > > > > substring(replaced,7,1) + > > > > substring(replaced,8,1) + > > > > substring(replaced,9,1) > > > > ) >2 AND > > > > (substring(replaced,3,1)="0") AND > > > > ( > > > > substring(replaced,12,1) + > > > > substring(replaced,13,1) + > > > > substring(replaced,14,1) + > > > > substring(replaced,15,1) + > > > > substring(replaced,16,1) + > > > > substring(replaced,17,1) + > > > > substring(replaced,18,1) + > > > > substring(replaced,19,1) > > > > ) >5 > > > > ; > > > > AND > > > > insert into rule3 > > > > select id > > > > from text_uniq_bin > > > > where (substring(rev_rep,1,1)="1") AND > > > > ( > > > > substring(replaced,1,1) + > > > > substring(replaced,2,1) + > > > > substring(replaced,3,1) + > > > > substring(replaced,4,1) + > > > > substring(replaced,5,1) + > > > > substring(replaced,6,1) + > > > > substring(replaced,7,1) + > > > > substring(replaced,8,1) + > > > > substring(replaced,9,1) > > > > ) >2 AND > > > > (substring(rev_rep,3,1)="0") AND > > > > ( > > > > substring(replaced,12,1) + > > > > substring(replaced,13,1) + > > > > substring(replaced,14,1) + > > > > substring(replaced,15,1) + > > > > substring(replaced,16,1) + > > > > substring(replaced,17,1) + > > > > substring(replaced,18,1) + > > > > substring(replaced,19,1) > > > > ) <=5 AND > > > > (substring(rev_rep,2,1)="0") AND > > > > ( > > > > substring(replaced,6,1) + > > > > substring(replaced,7,1) + > > > > substring(replaced,8,1) + > > > > substring(replaced,9,1) + > > > > substring(replaced,10,1) + > > > > substring(replaced,11,1) + > > > > substring(replaced,12,1) + > > > > substring(replaced,13,1) + > > > > substring(replaced,14,1) + > > > > substring(replaced,15,1) + > > > > substring(replaced,16,1) + > > > > substring(replaced,17,1) + > > > > substring(replaced,18,1) + > > > > substring(replaced,19,1) > > > > ) >7 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
