Just wondering: this link seems to refer to Firebird/InterBase, not
MySQL.
In particular, MySQL stores Blobs in row, the text describes the
out of row storage of Blobs.
As a result, I don't think there is much difference in the
performance of BLOB and VARCHAR(255) in MySQL (VARCHAR is
Of course this will return an empty set because you have only selected
the test_id, try this;
SELECT * FROM tests WHERE test_id IS NULL
Empty set empty column
Martijn Tonies
Database Workbench - tool for InterBase, Firebird, MySQL, NexusDB, Oracle
MS SQL Server
Upscene Productions
SELECT * FROM tests WHERE test_id IS NULL
Yes, that works, but I was also trying SELECT * instead of just the
key
field (just a typo in the example). The problem was in the equal sign
versus the 'IS' operator. Any reason why MySQL does not honor
field=NULL? Seems kind of odd.
Sql
Hi,
Could you please tell how I can tell how much memory does mysql server
allocate on a linux box? I tried doing:
top -b -n 1 | grep mysql
But, it printed out bunch of processes for mysql. Are these all using
shared memory so each line gives you the total amount for mysql? How
can one
On Tue, 2006-10-31 at 01:30 -0800, Cabbar Duzayak wrote:
Hi,
Could you please tell how I can tell how much memory does mysql server
allocate on a linux box? I tried doing:
top -b -n 1 | grep mysql
But, it printed out bunch of processes for mysql. Are these all using
shared memory so
Which thread library is the mysqld linked against? Linuxthreads shows
each thread as a separate process in top or ps output. All threads
share the same memory. From your output, it is likely that you are
using linuxthreads(all pids having the same VSZ and RES memory).
Regards,
Ravi
Cabbar
Hi,
What impact does the MySQL 5.0.27 ABI changes have on various components
available from the MySQL Website:
* OBDC 3.51
* php pdo-mysql
* php ext/mysql
Does the ABI breakage which this release fixes cause issues when
connecting from 5.0.26 clients or only for clients which use
Hi!
2 level derived SQL like this:
select field1,field2,(select sum(f3) from (select f3 from b1 where
b1.f2=a1.f2) a3 ) field3
from a1
SQL error, table a1 not found , that is a1.f2 not found
Regards!
Shuming Wang
Xtech Company limited
Room 29H, 29/F,Plaza 2, Tiancheng Building,No 96
Philip Mather wrote:
Taymour,
I just bough innodb hotbackup, I need to do incremental backup as I
have a database which is several GB. Is it ok that I enable the
binary log and using innodb hotbackup to create a full backup and use
the binary log for incremental ?, if yes how do I force
Hello,
is it safe to give users in s shared hosting environment the
Create_tmp_table_priv privilege? Are any other privileges granted by
this option? Why does mysql store the temporary tables? What happens if
the connection dies before mysql has deleted the temporary table? Does
you user see
Apologies if this is covered elsewhere, but I can't seem to track down all the
pieces...
I just installed mysql (4.1.21) on a multi-cpu opteron system running fedora
core. I used the binary distribution,
mysql-standard-4.1.21-unknown-linux-gnu-x86_64-glibc23
instead of compiling it myself
Hi everyone
I have a PHP script that will run every minute and do a lot of SELECT
and UPDATE statments
All my tables are InnoDB and I'm using PHP 5 and POD class (
http://php.net/pod ) to connect to mysql, in my script I start the
transaction (using method beginTransaction() ) in the beginning
In the last episode (Oct 31), Ow Mun Heng said:
Just wanted to post this here to see if anyone knows the difference.
In MSSQL, there is a hint which can be used to ask the DB to not lock
the tables during queries and then to read un-commited/dirty data.
This command is like
select
[snip]
And the reason for that is because nothing is actually equal to NULL.
For a field to be equal to NULL it would actually have to contain NULL,
in which case it would not be actually NULL.
What?
NULL doesn't equal NULL because NULL means unknown.
A column can have 2 states: known or
On Tue, Oct 31, 2006 at 08:58:04PM +0300, Ahmad Al-Twaijiry wrote:
is it possible that one of my script process will select the same data
that the other process is selecting or updating ? or if I run a second
process of my script it will not be able to read/write anything until
the first
I inherited a system in which the code was writing the string NULL into a
CHAR field. It took me a long time to figure out what MySQL CLI was showing
me.
These kids today...
Regards,
Jerry Schwartz
Global Information Incorporated
195 Farmington Ave.
Farmington, CT 06032
860.674.8796 / FAX:
hello everybody
anybody had to deal with this?
i have a windows form created on VB.net to get a report on embbeded crystal
reports develop program
im trying to customize the fields to show by using the CR form via Sql Sintax
option for the fields
but the formula editor seems does not
Hi list,
Question about MyISAM vs InnoDB ? What is the best to use, I have a
large table contain around 10 millons of records. What is the best for me ?
Use MyISAM or InnoDB ?
Ty for reply ☺
--
MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To
Hello,
Although the number of records is a consideration to weigh in your decision,
there are many other (perhaps more important) factors to consider.
For example, do you need foreign keys? transactions? row-level locks?...then
InnoDB is your choice.
Perhaps with more details concerning the
I inherited a system in which the code was writing the string NULL into
a
CHAR field. It took me a long time to figure out what MySQL CLI was
showing
me.
These kids today...
Oh my, sounds like a candidate for www.thedailywtf.com :-)
Martijn Tonies
Database Workbench - development tool
This should be simple, but I haven't used a subquery in quite this way, and
have little experience with GROUP BY.
I have 2 tables
prod:prod_id /* a unique key */
prod_rel:prod_id /* values that tie prod_rel to prod */
A prod_id in prod might have 0 or more matching rows in prod_rel.
DBTools Software is pleased to announce the new DBManager Standard Edition.
This is a bug fix with some new features and improvements.
New Features and Improvements
a.. Better support for SQlite Unicode databases
b.. Now the Freeware Edition can load as many servers as available (1
Database
I have a query that works and returns the correct results. However,
it is very slow ( 6-12 seconds on 5000 row table). Since this table
will grow to several hundred thousand rows very shortly, I am worried.
Here is the query that works:
SELECT id, subject, updated FROM mrldisc WHERE (id IN
Albert, it seems like the first query could be simplified, like so:
SELECT id, subject, updated FROM mrldisc
WHERE updated SUBDATE(NOW(), INTERVAL 48 HOUR)
ORDER BY updated DESC LIMIT 50
This might help it hit the index you've created on the UPDATED column.
I know there have been bugs here
This might work for you, Jerry - you're on the right track, pretty close.
SELECT prod.prod_id, COUNT(*)
FROM prod, prod_rel
WHERE prod.prod_id = prod_rel.prod_id
GROUP BY prod.prod_id
ORDER BY 2 DESC
LIMIT 1
Be aware that using the LIMIT 1 may be misleading in that if you have
multiple entries
Dan,
On Oct 31, 2006, at 3:41 PM, Dan Buettner wrote:
Albert, it seems like the first query could be simplified, like so:
SELECT id, subject, updated FROM mrldisc
WHERE updated SUBDATE(NOW(), INTERVAL 48 HOUR)
ORDER BY updated DESC LIMIT 50
This query won't work. The table contains
Dan,
Actually you were on the right track. I changed your suggested query
to the following and it seems to work and is a lot quicker.
SELECT id, subject, updated FROM mrldisc WHERE updated SUBDATE(NOW
(), INTERVAL 48 HOUR) AND mainthread = 'T' ORDER BY updated DESC
LIMIT 50
Thanks.
On Tue, 2006-10-31 at 10:35 -0600, Dan Nelson wrote:
In the last episode (Oct 31), Ow Mun Heng said:
Just wanted to post this here to see if anyone knows the difference.
In MSSQL, there is a hint which can be used to ask the DB to not lock
the tables during queries and then to read
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