disclaimer: i know nothing about java or jdbc. a co-worker is trying to
access a database i've set up using jdbc. he says that my enum column
is always returning an integer value instead of the string. obviously
this is less than desirable.
does anybody have any advice i could give him on
Ed Pauley II wrote:
This is another geographical location with automatic failover if there
is a problem, network, hardware etc. with the primary location. When the
problem is corrected, or corrects itself the traffic is automatically
sent back to the primary location. Without 2-way replication
Markus Fischer wrote:
Basically, this means if I've a table like this
id1
id2
id3
id4
id5
and I've two different select statements:
select * from ... where id1 = .. and id2 = ..
and the other being
select * from ... where id3 = .. and id4 = ..
I would create two indexes, one for id1/id2
Our mysql master machine crashed (hardware problem) and rebooted. When
it came back up, it started a new master log file. The slaves, however,
were all stuck on the last log file. They still showed both replication
threads running, no errors, but they just did not advance. I had to
What happened to MySQL Control Center (aka mycc or mysqlcc)? The
dev.mysql.com site redirects to the Query Browser page. QB is a poor
substitute for mycc. It looks like neither of them has had active
development much lately but at least mycc, even in its beta stage, is
fairly useful.
Gleb Paharenko wrote:
Hello.
Have a look here:
http://dev.mysql.com/doc/refman/5.0/en/not-enough-file-handles.html
thanks, i've upped the open-files-limit variable. we'll see how it goes.
-jsd-
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MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To
Master and slaves are both Mysql 4.1.14 standard. There are six slaves,
and this error kept happening on #2 and #4, but then it stopped. I
thought it was all gone for good but today it happened on #3.
The symptom is: Replication stops with the following error:
Error 'Can't find file:
I'm moving from 32-bit intel to the brave new world of AMD64. Our new
servers are dual Opterons with 16GB of RAM. We will be running mysql
4.1.14-standard on redhat enterprise linux 4 x86_64.
Since I'm new to this, what's my best bang-for-buck in setting up
mysql's memory usage?
-jsd-
Brian Dunning wrote:
I have a table of questions, and a table of answers. Each question has
a related answer record for each person who has answered that question,
and each answer is timestamped. How do I find a list of questions where
the MOST RECENT answer is less than 30 days ago?
Pooly wrote:
Damnit !
Thanks for pointing it, I forgot these things.
But it's a bit more subtle :
If any column in a table has a variable length, the entire row becomes
variable-length as a result. Therefore, if a table contains any
variable-length columns (VARCHAR, TEXT, or BLOB), all CHAR
i'm trying to run this query:
SELECT COUNT(1) FROM MSGS m, MBOARD b WHERE b.BaseType = 0 AND m.BoardID
= b.BoardID;
MSGS has 9.5 million rows, and is indexed on BoardID
MBOARD has 69K rows and is indexed on BaseType
EXPLAIN shows:
mysql explain SELECT COUNT(1) FROM MSGS m, MBOARD b WHERE
Andrew Braithwaite wrote:
Hi,
You're doing a join on 'BoardID' on the tables MSGS and MBOARD. Is the
BoardID field indexed on the MSGS table too? If not then that may be your
problem.
MSGS.BoardID is indexed, and the EXPLAIN output I included in the
original message shows that it is
Andrew Braithwaite wrote:
Sorry, I meant to say is the 'BoardID' field indexed on the MBOARD table
too?
yes, BoardID is the primary key. BaseType is also indexed.
from the EXPLAIN output i can see that mysql is choosing to use BaseType
as the index for MBOARD (as we know, mysql can only use
Tim Wood wrote:
a-- select test_id from tests where status=1 and priority 11 order by
priority
b-- update tests set status=2 where test_id = result of query above
What's the best way to ensure that a single client executes both a and b
atomically so that no other client can show up and execute
[EMAIL PROTECTED] wrote:
So this would imply that you cannot simply stop/start a slave server -
instead, I would need to write a wrapper script that stops the slave
using STOP SLAVE, and at next startup, read the master.info file to
find out where it left off, and then issue a CHANGE MASTER TO...
Jason Joines wrote:
I'm using MySQL 4.1.7 and need to create a column to store date and
time. Also, I need to be able to update the column with something like:
update machines set update3_status='y', update3_time=SOMETHING;
I don't want update3_time to be automatically changed any time
Kevin A. Burton wrote:
Was curious what people on the list are using for load balancing.. there
are a number of techniques here but it would be interesting if people
could share some real-world experiences
HTTP load balancing is pretty well understood but there's not a bunch
out there on
Dan Sashko wrote:
Hi, anyone has suggestions what changes to make to allow this query to
run faster?
SELECT domain FROM tbl_1
WHERE
id 0 and id 2
domain = 12.221.190.111
AND score IS NOT Null
AND data LIKE %param=search
GROUP BY domain, data
--
every one of those WHERE clauses
Fredrik Carlsson wrote:
Hi list,
I have a question regarding mysql and innodb.
My current setup uses myisam and the db size is about 1.6 GB with two
table that each have about 500k rows. I perform alot of fulltext search
on these tables and they can sometimes take along time to finish and
when
My master has two databases: channel and hardware. I'm only interested
in replicating hardware, so I set up replicate-do-db=hardware on the slaves.
However, I am having problems because of giant LOAD DATA operations
performed nightly on channel. Replication blows up with max packet
exceeded
i probably should have mentioned: both master slave are running 4.0.20
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We were having terrible problems with a master/slave setup. The master
does a huge amount of writes, and the slave simply started lagging
behind, despite both machines being identical hardware-wise. This made
the application basically unusable because eventually the slave was
hours behind
Also even after we re-converted all the slave's Inno tables back to
MyISAM it *still* lagged out. Only after I disabled the
Inno engine
entirely did the problem abate.
Any ideas why? Does InnoDB use resources even if there are no
active tables using the engine?
This is most
From: David Griffiths [mailto:[EMAIL PROTECTED]
Sent: Tuesday, August 03, 2004 1:04 PM
Subject: Re: Replication + InnoDB = badness
Could it be a network bandwidth issue? Remember, all that
data needs to
be transmitted across to the slave. If you are on a
10-megabit network,
it could
i've got one master and one slave. the master is VERY busy, tons of
inserts/updates/deletes all the time. (it's an extremely high traffic
message board system.)
we've got a situation right now where the slave starts lagging WAY
behind the master. it's as if it simply can't run through the
matt ryan wrote:
There is a perl script that comes with MySQL called mysqldumpslow.
You can just run it on your slow log and it will output summary
statistics about the slow log.
I saw that in the docs, but I definitly dont want to install perl on a
production server, I never looked to see
I've got a product story setup where there can be multiple stories of
a given type for any product. I want to find the names of the products
with the most-recently-posted stories of a certain type. This query
works well:
SELECT p.id,p.title
FROM product p
join e_prod ep on ep.product=p.id
Victor Pendleton wrote:
Have you tried using a group by clause? Group by title
same problem - the group by happens before the order by and you get
essentially random results.
-Original Message-
From: news
To: [EMAIL PROTECTED]
Sent: 7/9/04 3:08 PM
Subject: SELECT DISTINCT + ORDER BY
venkata ramana wrote:
Hi,
I don't know whether I can ask this question on this mailing
list or not, but I want to know how the php communicates with mysql,
when it is on the localhost. Does it use unix domain sockets or it
uses TCP sockets only? Any help or pointers in this regard will be
i've read the ORDER BY optimization page in the manual but i'm stumped
by my inability to get this query to avoid the filesort.
the table structure is:
CREATE TABLE story (
id int(11) NOT NULL auto_increment,
headline text,
deck text,
free_override tinyint(1) NOT NULL default '0',
Victor Pendleton wrote:
What does the explain plan look like? It sounds like the query is using the
fulltext index. Remember that only one index per table can be used when
performing a query.
explain select id, headline, date_format(s.post_date,'%Y/%m/%d')
directory, post_date sort_date
from
Santino wrote:
Hello,
Does the cluster support fulltext indexes?
After a quick reading of preliminary documentation it seems NO.
Can someone confirm it?
i had a meeting with the mysql cluster sales team and they said it is
not supported. fulltext is for myisam only. cluster uses NDB storage
Brandon Metcalf wrote:
We are running 3.23.58 on Solaris 8 and seeing the following problem.
Periodically, mysqld gets into a state where we can't query just one
table in all of our DBs--queries just hang. Restarting mysqld always
fixes the problem, but a SIGKILL is required to stop it.
Could
Ben Ricker wrote:
I believe all the tables are MyISAM...the DB is 3.2.x.
I know there will be an inconsistency as we only do nightly backups; any
transactions that occur before the scp will not be there. If we failover
before the backup, we can have up to 24 hours of data missing.
I am concerned
Dathan Vance Pattishall wrote:
log-bin=/var/opt/mysql/db2-binlog
skip-innodb
log-error=/var/opt/mysql/db2-errlog
This is on a separate drive?
yes, the database is the only thing on the high speed RAID. everything
else is on the other drive (also a RAID but only RAID0 with 2 drives).
any ideas
I've got a very high traffic discussion forum database that is
constantly running into a problem with lots and lots of threads in the
Locked state. i was under the impression that MySQL could
update/insert and select from the same table at the same time, but it
doesn't seem to be the case.
is there any way to get mysqld 4.0.15a from the linux binary
distribution to use another path for my.cnf apart from /etc/my.cnf
/usr/local/mysql/data/my.cnf ~/.my.cnf
the problem is at my company i am not allowed to install things as root,
so i can't put files in /etc or /usr/local/mysql/data.
At 11:13 AM 9/19/2003, Paul DuBois wrote:
At 10:42 AM -0700 9/19/03, Jon Drukman wrote:
is there any way to get mysqld 4.0.15a from the linux binary distribution
to use another path for my.cnf apart from /etc/my.cnf
/usr/local/mysql/data/my.cnf ~/.my.cnf
No, but if you have control over how
We have a very high traffic mysql app running in ASP on Windows 2000.
It connects to a Linux mysql server (4.0.12) via ADODB and MyODBC. It's
leaking memory like crazy. We've implemented connection pooling and
long timeouts on connections so as to minimize the number of connects
closes, but
Antony Dovgal wrote:
try to use error_reporting(E_ALL); and to see what happends.
maybe error logging will help you to solve your trouble.
I don't beleive in such bugs, it's a problem of your code imho.
here's my code:
mysql_connect() or die(mysql connect failed: $php_errmsg / .
mysql_error());
bruce wrote:
Hi...
A mysql/Apache issue:
I get the following when I'm trying to run a test web site on an Apache
2.0/RH8.0 setup.
Warning: Access denied for user: '[EMAIL PROTECTED]' (Using password: YES) in
/var/www/html/dbid/mysql/database.php on line 17
Antony Dovgal wrote:
On Tue, 19 Aug 2003 14:36:15 -0700
Jon Drukman [EMAIL PROTECTED] wrote:
Approximately 1% of the time it just fails, for no stated reason:
Warning: mysql_connect() [http://www.php.net/function.mysql-connect]:
in /var/httpd/htdocs/pi/pi.php on line 3
mysql connect failed
Jack Coxen wrote:
I had originally planned to use syntax similar to:
DELETE * FROM table_name WHERE `dtime` [90 days ago]
delete * from table_name where to_days(now())-to_days(dtime) 90
After the DELETE runs, I plan on running MYISAMCHK on the affected table.
Then I'll repeat both steps for
gord barq wrote:
I have this query which does a left outer join and it takes forever
(like half a day). Here are the results of an explain analysis.
mysql explain SELECT count(searchresult.title) AS number,
campaigntrack.title, tracknum, trackid FROM campaigntrack LEFT OUTER
JOIN searchresult
Jackson Miller wrote:
I am setting up a dedicated MySQL server with some pretty heavy usage. I am
not much of a sys admin (mostly a programmer). I have some questions about
the best drive configuration.
I have 4 SCSI drives currently.
I would like to have 1 drive run the OS,
1 drive to be
Antony Dovgal wrote:
mysql_error is not set when mysql_connect fails, because there is no
actual mysql resource to get the error message from.
yes, there is no mysql resource at this moment.
just don't specify it and mysql_error() will tell something like Can't connect to local
MySQL server
Lefevre, Steven wrote:
I say go with RAID 5, on a controller card.
Mirroring just gives you backup, and you lose half your diskspace. It offers
no performance benefit, and actually the computer might have to work harder
to make sure the drives are in sync.
that is not true. mirroring gives you
I've got a library of PHP code whose first line is a mysql_connect
statement, like this:
$dbh=mysql_connect() or die(mysql connect failed: $php_errmsg);
Approximately 1% of the time it just fails, for no stated reason:
Warning: mysql_connect() [http://www.php.net/function.mysql-connect]:
in
unix domain.
Michael S. Fischer wrote:
Are you connecting through a TCP or a UNIX domain socket?
--Michael
-Original Message-
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Jon Drukman
Sent: Tuesday, August 19, 2003 2:36 PM
To: [EMAIL PROTECTED]
Subject: PHP mysql_connect randomly
this query:
select ep.product, s.id,s.type,s.headline,date_format(post_date,'%a,
%m/%d/%y - %h:%m %p') date,user_level,s.ext_url from story s left join
e_prod ep on ep.story=s.id where s.post_date date_sub(now(), interval 14
day) and s.status = 9 order by post_date desc limit 10
returns the
At 04:26 AM 7/15/2002, David Harper wrote:
Description:
Every 60 seconds, the replication slave gets an error 1159 from
the master server. Thirty seconds later, it reconnects to the master.
Then the cycle starts all over again. I have master-connect-retry=30 in
the config file.
Here is
At 01:01 PM 7/15/2002, David yahoo wrote:
how to retrieve the 2 last char of a string stored in db ? :
SELECT LENGTH(db) as len , SUBSTRING(db from len-2 ) from nlconfig;
NOT WORK .!
In php by example, there is a substr with a negative pos that give char at
end ! no in mysql !
select
At 05:25 AM 7/13/2002 +, toby - wrote:
1.
i ve a page that picks up random records from mysql database and displays them
now i want to limit the display to 5 or 6 records per page
that is if it could pickup ALL the records in the db and disolay only 5 or
6 on each page
select blah from blah
i am having the Error reading packet from server: (server_errno=1159)
replication problem.
in searching the archives for others experience replication problems, i
came across the suggestion of adding these lines to my.cnf
set-variable = slave_net_timeout=3600
set-variable =
At 01:48 PM 7/12/2002, Jeremy Zawodny wrote:
On Fri, Jul 12, 2002 at 01:43:02PM -0700, Jon Drukman wrote:
now instead of getting the error every 30 seconds, i get it every
hour. is there a way to make it go away forever?
Make the number really big?
I wonder if you can set it to 0 to mean
At 01:43 AM 2/12/2002, you wrote:
Hi,
Does this work for you?
select ad.id,adtype,name,sum(review.id is not null) from person
review left join ad on ad.id=review.id
group by ad.id;
this one returns 1 for the sum column no mater what.
select ad.id,adtype,name,sum(if
i have what is basically a personal ad database.
in one table, i have a list of advertisers. in another table i have a list
of reviews. (there's a third table with stuff like their name, address,
etc). i want to get a list of advertisers and the number of reviews all in
one query. i can
i'm trying to join 3 tables. tables 1 and 2 contain information about a
person, table 3 contains reviews of that person and may not have any
data. outer join, right? i can't get it to work though.
the tricky part is i don't want to return the actual data from the 3rd
table, i just want the
At 10:40 AM 9/25/2001 -0700, Jon Drukman wrote:
Description:
mysql apparently gets stuck when unlocking tables
i have several applications that do:
LOCK TABLES pv WRITE
LOAD DATA LOCAL INFILE 'pageview.data' INTO TABLE pv (id,count,date)
UNLOCK
At 03:30 PM 9/18/2001 -0500, Jay Paulson wrote:
What is the command in MySQL to grab the last item that was inserted into
the database?
i'm 99% sure there isn't one.
a sql table is an unordered set. there is no concept of first or last. in
theory you could get the same SELECT statement
i have been running 3.22.25 on solaris 7 for quite a while. i ran into a
problem with it a few days ago where it basically took forever to delete
rows (these are huge tables - several million rows, with lots of indexes,
and i needed to delete some millions of rows... i started it, and let it
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