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Very Slow Update Statement


I am having an issue with an UPDATE statement that takes a very long time. I am using
1 table in a schema to update another table in another schema. Below are the create statements and the update statment I am using. Table and column names have been changed to protect the innocent :) Code:




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Update Too Slow
I need to update 25 * 5000 records, if I do one at the time it takes too
long time, do any one have a good proposal ?

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Slow Update
The following query can sometimes take up to 2.5 seconds to execute on a table with only 150,000 records.
UPDATE items SET item_views = item_views + 1 WHERE id = 5897;
is there any way I could speed this up? Some setting I could change to make MySQL faster for this?
The field "id" is the primary table key.

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Very Slow Table Update
I have two tables. One is really a subset of the other. However, they came in different data files and I would like to pull data from one and put it into the other. However, it is VERY slow!

Once the tables are setup I will only read from them and perform operations. I will never update or insert. However, I can't get things setup to that point. Code:

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UPDATE Function Very Slow??
I have a large table (77,321 Rows) and I'm trying to update it. For some reason, UPDATE takes a long time. Maybe it's my query? I'm doing it through php, maybe that's it? I'm running the program locally using the CLI, and it still takes ages.

Should I not expect it to be as fast as SELECT functions?

$update ="UPDATE `ch_products` SET `products_weight` = '".$IDS[$i][Weight]."' WHERE `xref1` = '".$IDS[$i][ID]."'";

How can I make this faster?

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Slow Update Query
I have about 2000 update queries to do, which takes about 1 hr on 250,000 rows.
My table is getting kinda slow here is the query i am using
UPDATE nametable SET
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I am wondering if the same thing is possible with an insert... on duplicate key statement?

I cant seem to get the insert statement to work, but not even sure whether it is appropriate.

With this query I am basically finding and replacing some columns based upon another table (within the php script I am using)

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UPDATE Large Number Of Rows With CASE Is Too Slow
UPDATE table SET rating =
(CASE uniq
WHEN 'ACD' THEN 0.6857
WHEN 'GGYB' THEN 0.5831
WHEN 'QUCG' THEN 0.5831
WHEN 'CYP' THEN 0.5831
...
ELSE 0 ....

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UPDATE Large Number Of Rows With CASE Is Very Slow
UPDATE table SET rating =
(CASE uniq
WHEN 'ACD' THEN 0.6857
WHEN 'GGYB' THEN 0.5831
WHEN 'QUCG' THEN 0.5831
WHEN 'CYP' THEN 0.5831
...
ELSE 0
END), score = (SELECT @t := 1/(1+rating))*votes_up - (1-@t)*votes_down;

The table has the column `uniq` as PRIMARY KEY of type VARCHAR(10), and about 500 rows. I need to update the entire table with this query. The problem is the query runs extremely slowly, taking 4.6529 seconds to run. I realize the index is not the most efficient, but is it the main culprit?

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SQL-Update-Statement
I have to update all UA-fields in the table idrz_kennzahl with primary
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update idrz_kennzahl
set UA=1234
where
idrz_kennzahl.idrz =(SELECT per_verwaltung.idrz from per_verwaltung where
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Update With If Statement
I'm trying a statement which I cannot figure out what I'm doing wrong on. I've tried every combination that I can think of and stared myself blue with no success.

update cdr set Cost=if(mod(BillSec,6)=0,int(BillSec/6),int(BillSec/6)+1)

The idea is to update Cost with a value depending on the result of a formula. It's an empty field which gets a computed value from other fields. cdr is the table.

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Update Statement
I am currently updating a table and increasing a column value by 1, the problem is that he don't increase 1 but it does increase the double of the value specified.
Why does it performs the update like this? And how can i solve this problem?

SQL Statement Syntax used: UPDATE table_name SET column_name=column_name+1 WHERE id=1

Version of MySQL: 4.1.7 for Windows installed in Windows 2003 Server.

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What Would This Update Statement Be?
I have an array of ids formatted like 1,2,3,4,5

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Long Old UPDATE Statement
I have the following SQL which gives me the row Im after

SELECT *
FROM staff, staffemails
WHERE staff.users_username='$user'
and staff.staff_id = staffemails.staff_id

thing is I now want to perform an update on the result of this query. Ive tried

UPDATE staffemails
SET is_registered ='0'
WHERE staff.users_username = '$user'
and staffemails.staff_id = staff.staff_id .

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Select And Update Statement
Is it possible to combine a select and update statement in mysql? If
so, what is the syntax.

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Update Statement Not Working
Why does this simple update statement not work with a mysql version 3.23.49,
it does work when using 4.0.24..... ?

UPDATE listitem,vjbase,list SET listitem.showsec = 7 WHERE listitem.id_vjbase = vjbase.vjbase_id AND listitem.id_vjbase = 3 AND vjbase.id_viduser = 61000 AND listitem.id_list = list.list_id AND listitem.id_list = 1 AND list.id_viduser = 61000

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UPDATE Statement Doesn't Work
TABLE - abc

ID NAME
___________
1 hello
12 abc


UPDATE `abc` SET `ID`='5' AND `NAME`='hello' WHERE `ID`='1' AND `NAME`='hello'

wherenver I try to update this table using above sql statement, it doesn't work. I just get "Row match:1 Changed:0" message.

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Special UPDATE Statement
UPDATE some_table st SET some_page_no=((select count(*) FROM some_table WHERE some_table_id<st.some_table_id and some_id=st.some_id and some_type='OK') div 10)+1 WHERE some_id=345 and some_type='OK'

I want to use the above to make a fast page index (10 on each page). I had something similar in mssql and it worked, but in myssql I get this error:

"You can't specify target table 'some_table' for update in FROM clause"

What have I done wrong or can the above simply not be done?

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UPDATE / JOIN STATEMENT
i have problems after updating mysql from 4.x to 5.0.19. This statement should update about 3000 rows but it only does 15 but there are definitely another 2000 rows with an older date and matching nr!

UPDATE tab1,tab2
SET tab2.newdate = NOW()
WHERE tab1.nr=tab2.nr;

I tried the variation with inner joining tab1 as well. same result.
Does anyone has an idea solving this problem? Perhaps it´s a bug?

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Select + Update In One Statement
I have these statements.

$selectdata = "SELECT * FROM imagetrack WHERE fimsid = ".$_GET["fimsid"]." AND name = '".$_GET["service"] . "'";

$query = mysql_query($selectdata) or die(mysql_error());
$update = "UPDATE imagetrack SET seen = seen+1 WHERE fimsid = ".$_GET["fimsid"]." AND name = '".$_GET["service"] . "'";

Basically i was wondering if there was a statement where i can select everything and update the seen in one statement.

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Conditions In UPDATE Statement
i have some data to be updated in a specific row - WHERE id=1

data:
$min_time, $max_time, $time, $attempts

so, i would like to calculate new avg and replace min_time with new value, if new min_time is smaller then that one stored in the database.

"UPDATE mytable SET
avg=(avg*attempts+$time) DEV (attempts+1),
min_time=**here i could use help** ??IF(min_time>$min_time)$min_time ELSE min_time??
**and similar with max_time .

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Update Statement Problem? Plz Help.
I've a simple doubt of whether can or can't i update two tables by using joins as below. the below update statement matched 2 rows one each for two tables but didn't update.

mysql> update audio join pcr_info on audio.audio_sid=pcr_info.pcr_sid set audio.
audio_pid=4896,audio.audio_prgm_num=3,audio.audio_type="MPEGLayer1",audio.audio_
sr=44.1,audio.audio_mode="1_0",audio.audio_bitrate=320,pcr_info.pcr_pid=49 where
pcr_info.pcr_prgm_num=3 and pcr_info.pcr_sid="2501" and audio.audio_pid=4896 an
d pcr_info.pcr_pid=49;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 2 Changed: 0 Warnings: 0

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DELETE,UPDATE Or Other Statement In WHERE
I would like to let my admins write WHERE statements. . In panel where you can see all users of my site, admin should have input where he can put some filters in WHERE statment. E.G. standard query is
SELECT login FROM USERS .
and admin would write age > 18 and male = 'f'
. php script would conact it and it would execute
SELECT login FROM users WHERE age > 18 and male = 'f'
I have question about security of this solution. Is possible to put in WHERE statement sobe dangeurous statemetns like DELETE of UPDATE?

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Conditional Update Statement
I have a table with a field of ID numbers. I want to update this field and replace the ID numbers. For example I want every record that currently has the ID number 2,5,6,or 9 to be replaced with a 1. Every record with 1 or 4 to be replaced with 2 ...

I can't seem to form the update statement to do this. I can do them one at a time but this won't work because if I change 2,5,6, and 9 to 1 then when I run then update for 1 and 4 it will change them all. Does this make any sense?

I want some way to be able to use a condition...if id=2 or 4 or 6 set it to 1 and if id= 1 or 4 set it to 2.

My failed attempt:

mysql> update client_software set software_id=1
WHERE (software_id=2 or software_id=5 or software_id=6 or software_id=9)
AND software_id=2 WHERE (software_id=3 or software_id=7 or software_id=8)
AND software_id=3 WHERE (software_id=1 or software_id=4);

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Insert Or Update In One Statement
I sometimes find myself writing PHP code that checks for a value in a table and updates it with a new value if it exists, or insert it into the table if it doesnt. Is there any way to do this with one sql statement?

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Conditional Update Statement
MySQL Code:
UPDATE     tournamentsSET     tournament_player1 = IF (tournament_player1 = 5, 1, 0),  
    tournament_player2 = IF (tournament_player2 = 5, 1, 0), 
    tournament_player3 = IF (tournament_player3 = 5, 1, 0), 
    tournament_player4 = IF (tournament_player4 = 5, 1, 0) 
WHERE    tournament_time = 1 AND tournament_game = 1 ....

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Convert SELECT Statement To UPDATE
How do I convert the following SELECT statement to UPDATE statement? If I'm not mistaken, UPDATE statement could not involve more than one table.

SELECT * FROM F0116 LEFT JOIN F0101 ON F0116.ALAN8=F0101.ABAN8 WHERE F0116.ALCTR='' AND F0101.ABMCU='1'

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How To Do EXPLAIN For DELETE/UPDATE SQL Statement?
Anyone know how to do EXPLAIN for DELETE/UPDATE SQL Statement?

cause I only can see execution plan from SELECT statement. And anyone know if there is third party software which allow me to see the UI execution plan like MSSQL Query Analyzer?

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Update Statement Not Working On Server
this works on my machine but not where my site is hosted. They do use an older version of mysql could that be problem

update inv, newprice set inv.cost = newprice.price where inv.itemcode = newprice.itemcode

works fine on my machine her ebut on server i get error..

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Update Statement :: Affected Rows: 0
UPDATE `zipLocations` SET `z_zipCode` = '06001' WHERE `z_zipCode` =6001 LIMIT 1 ;

Field Type Attributes Null Default Extra Action
z_zipCode int(5) No 0
z_cityName varchar(50) No
s_stateAbbr char(2) No
z_countyName varchar(50) No
z_areaCodes varchar(50) No

I even went through phpmyadmin found the row clicked on the edit button for that row and updated it. and it still doesn't update.. im' thinking it has to do with the data type being INT...

Why doesn't it update it ?.. It says it was successful.
Affected rows: 0 (Query took 0.0002 sec)

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CASE Statement In Update Command
I'm trying to update one table (tbl_usage) based on information from another table (tbl_subscriptions) joined by the userID. The usage table tracks the number of times a user hits a page, and decrements the count each time. When the user has a zero count, they are redirected to a warning page.

Each week the count is reset depending on what type of license they have (licenseType) and how many of those licenses they've bought (numLicenses). A group license (G) gives them 100 hits, and an individual license (I) gives them 5 hits.

I'm trying to use a case statement to perform this count reset operation, but I can't seem to get it to work. The following case statement works just fine: Code:

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Convert A Nested Update Statement
i have a nested update statement in my sql server as follows
UPDATE DIM_EVENT .

SET INVOICE_AMOUNT =
(SELECT SUM(INV.INVOICE_AMOUNT_TOTAL)
FROM INVOICE INV
WHERE INV.INVOICE_REFERENCE_NUMBER = DIM_EVENT.OBJECT_ID
AND INV.INVOICE_AMOUNT_TOTAL IS NOT NULL)
WHERE DIM_EVENT.EVENT_TYPE_CODE IN ('OFULN', 'OAUTH', 'CRDRL');
what is the equivalent in MySQL.

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Update Statement :: Data From One Table To Other
I have two tables, and I want to take data from one table, and overwrite it onto the second. Unfortunately, my SQL is pretty weak.

The first table has a mediumtext column and a id (primary key) column. The second has an id (the same as the first), a number, and a mediumtext column.

I want to take the contents of the mediumtext field with the highest number and replace the contents of the field in the first column with it with the same id.

My instinct is to do it this way:

update forum1post p
set p.pagetext = (select query1.message
from (select pe.message, max(pe.editnum)
from forum1post_edits pe
group by p.postid) query1)
where p.pagetext = 'Why did you all flame my topic. Screw your ****ing forums.'
and p.postid = pe.postid

However, that does not work, as pe is not recognized.

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Help With Simple SQL Statement To Update Zipcodes
I have a varchar(5) field in a database called 'zip_code'. I imported some zipcodes from an Excel spreadsheet, but the spreadsheet had truncated any zipcode that started with a "0" and removed the zero, so the correct zipcode of "08993" was incorrectly placed into the record as "8993".

Would someone help me write a SQL statement to run on the field zip_code that would look at the data, if it was four characters long, add a "0" to the start and keep the remaining four characters in place?

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QUERY One Table And Update Another In ONE Statement?
ZIP_CODE:
zip_code
latitude
longitude

customers:
customer_id
...
zip_code
latitude
longitude

The lat and long in the customers table is blank. I want to lookup customers' zip code in the ZIP_CODE, get the related lat & long and update the customers table with that information. The result being that after this query is run, the customers table now has lat & long data.

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Identify Columns Changed By Update Statement
It says in the documentation that "If you set a column to the value it currently has, MySQL notices this and does not update it." is there anyway to identify what column values have changed? i.e. what columns have been updated?

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MySql Update Or Insert Statement To Modify A Word In All Caps
I have a field in my database called Subtopic. In this field I have a word LITERATURE in all caps. I need to change the word LITERATURE to LITERATURE followed by a colon then an empty space. Can someone give me the MySql statement I can paste into phpMyAdmin to make this change? Note: The Subtopic field contains the word "literature" but not in all caps because the Subtopic field is part the database that is an encyclopedia. Therefore, I want to change ONLY the word LITERATURE if the word LITERATURE is in all caps.

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Slow
What generally would be the reason why all my db driven sites are running slowly or even hanging. I am on braodband speed but just changed hosts.

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Very Slow Select
The line indicated below from my php script is very slow (about 10 seconds). I have this field indexed so I thought that it would be much faster. Could someone tell me what might be wrong?

I'm also including the dump of the table definitions. This is a cd cataloging database.

Right now the filenames table is empty and I'm trying to populate it, but at the rate it's going it would take days. I have about 700,000 records in the 'files' table, but none in the 'filenames' table yet. Code:

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MySQLdb Slow
I have a Python program that parses a file and inserts records into a
database with MySQLdb. I recently upgraded to MySQL 5.0.8, and now my
parser runs *really* slow. Writing out to CSV files is fine, but when I
try to insert the same records in a MySQL5 database, it slows to a
crawl. Using MySQL 4.1 seems fine. The data seems to be inserted
correctly, it's just really slow.

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Slow Restore
Mysql 4.1.15 on Win2k. Using InnoDB.

Using the mysql administrator gui to create a backup, everything goes
fine, and restores quickly.

Using the command line:

mysqldump %dbname% --single-transaction > %dbname%.sql

creates a file about 15% smaller than the gui produces, and is
EXTREMELY slow to restore. I have tried adding locks, skip opt,
everything. What does the gui use for a command to create this dump?

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HEAP So Slow
I have a heap database, with 1.5-1.6 milion rows. on that is 2 columns...

ID | Title

title is indexed. When i run a query like this
------------------
SELECT index_data.* FROM index_data INNER JOIN `index` ON index_data.id=index.id AND index.title LIKE '%$query%' WHERE playtime > $dur... The execution time is about seconds...
------------------
Even a single like statement just on `index` (heap) takes 3-6 seconds.

Here's the table stats...
----------------------------
Data 397,442 KB
Index 24,639 KB
Total 422,081 KB
----------------------------
Why??

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Too Slow Queries
I am using version 5.0.4. I noticed that suddenly my queries were becoming too slow. I have data in three tables, with 40,000 rows, 50,000 rows and 70,000 rows respectively. I was able to run queries that joined the three tables together and get the results in less than 5 seconds. I tried updating the tables through a program that used a stored procedure to delete the tables but I had some other problems. Since the I restored the data in the tables from backup databases. Now I can't run any queries that join the three tables together, it waits for a long time and then times out. The data in the tables look good. Now I can't get the results from any of the other backup databases either. It look like the entire MySQL server has slowed down greatly. I tried rebooting the server to no avail.

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Slow MySQL
mySQL has been running very slowly and I am getting errors. First I did 2 things I raised the ServerLimit number (apache) to allow for more connections, I also raised the max conncetions in my.cnf. I do not know if this took effect? That should have worked. But basically in phpmyadmin i get this error frequently. I am getting more traffic so I think it is that.

MySQL said: Documentation
#2002 - The server is not responding (or the local MySQL server's socket is not correctly configured)

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Slow Db Access
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
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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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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!
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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)

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