Slow Query Using NOT IN
I am migrating a MSSQL server to MySQL. I know the following SQL is valid for both servers, but MSSQL finishes execution of the query almost instantly, and MySQL has been running the query for the past ten minutes and still is not finished. There is basically the same amount of data in each database. Does anyone know ....
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I have worked with a few mysql dbs on different servers but i have recently been asked to work with one on nicnames. It seems horribly slow. Working in phpMyAdmin (which i had to install myself) it takes ages when i want to do anything. View the table structure, view the data..etc. Any way i can test the speed so that i can compare it against another server i work with and proove there is a speed issue and take it to nicnames cus it is crazy and is going to affect the speed of the website!!
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Slow Insertions
I have a MyISAM table with fixed width rows (ie no vars). I also have keys disabled. I am running a huge data load process. When it first started it was inserting about 38 records a second. Now, after about 200,000 records, it speed is about 22 recoerds per second. Whats going on here? and how can I improve it? I am loading about 15 million records, so the difference between 22 per sec and 38 per sec is SIGNIFICANT (ie 2 days).
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Slow Performance
On my index.php page, I have a simple query that checks the session_id against a table where I store other session_id'. If it's not there, it records it (unique hit). If it's there, it doesn't record it (not a unique hit.) This usually goes off without a hitch, and every month or so I empty the table. Right now I only have about 2500 rows, and it's taking forever to load the page. Is there something possibly server related that could be causing this? My host charges an arm and a leg just to see if there's something wrong if I bring up an issue, so I'd like some insight as to whether there's a commonly known server-side issue that can bog down performance.
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Slow Queries!
I have a website which has a users table in a mySQL database. This users table is large (It has about 25 columns - most varchar(100)) but only has about 10000 records. The records contain user information which is searched with a javascript form. My problem is that when I click to 'view all', it takes about 7 seconds to load. This seems a lot? Does 25 cloums seem sxcessive in a table? Can anyone point me to some good tutorials / docs on improving query performance? I have defined the colums as best as I can, but I am using SELECT * from table, would selecting individual columns make a big difference?
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Slow Subquery
Can anyone tell me why the following query with sub-query takes forever to finish? (I've le it run for 20 minutes, and it still hasn't finished) select date from temps where date in (select distinct date from observations where camera like "a") The sub query returns 10 dates. The outer query is on a table that contains about 40,000 rows. What's the big deal here? All I'm trying to do is select rows from "temps" that match a small range of 10 dates. Is there another way to do this? Is a sub-query the wrong approach?
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Slow Connection
I build an application and installed it on many machines. In every machine except two, the program works without problems. On this two, the connection with database is too slow. I saw the opened doors with 'netstat' and the computer opens about 5 or 6 ports (to the port 3306 of the mysql server) before sucessfuly connect with MySql Database and execute the sql. I don't know what could be happening. I realy need to fix this because the progrm is too slow with this error. Could anyone know what could be happening??
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Slow Subqueries
I know (by internet) that mySQL is very fast. Problem is that my subqueries that are very fast in Access or SQL Server but they are very slowly in mySQL - since I have to restart my computer because mySQL freeze all the processes. (the resources where used at maximum - 2 Gb RAM, 2,5 Ghz processor) This is the query : SELECT NPL, PP FROM P_A INNER JOIN ACTIONS ON P_A.NA =ACTIONS.ACT_N WHERE P_A.NA in (SELECT NA FROM P_A WHERE NP ='ABC') P_A has 5 columns and 12000 rows Actions has 5 columns and 770 rows Any suggestions ?
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Slow Request
I want to run the following request: mysql> select count(*) from fingerprints where fingerprint in (select fingerprint from fingerprints where id_file=3263); where fingerprints is the following table: ....
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Why Does MySQL So Slow
I just changed to use MySQL few days ago but it was a bad idea. My server now is running very slowly with the database. I'm using Perl5 and DBD::Mysql in my script. The system is Linux9, Apache2. I looked at these mysql pid and saw a lot of activities (about 400) while there are more 100 users online at this moment and lots of running under a the same pid number.
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Slow Max() Selection
I have a large table with some fields. Two of them are: year char(1) && year's rightmost character OrderNo integer Both are keys (BTREE). I need to select the last order in the year. select max(OrderNo) from ORDENES where year='8' While the year is growing the selection speed id decrement (12 seg).
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Slow Connections
I am using MyODBC-3.51.11-2-win on Win 2003 OS. I am not able to see all of the connections in the list under the System DSN tab. The connections that show allow the ASP pages to run at an expected rate. However, the ones not showing in the list are running extremely slow. If I attpemt to recreate the connection I am told that the connection already exists and asks if I want to replace the existing connection. Wheter I click yes or no the connections do not show and the pages run slowly. How do I get them to show or resolve the issue. The ASP code is the exact same SQL statements and connection strings as the in previous applications.
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