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What Is Execution Time Of A Query Based On? (was "a Mysql Question")


when selecting data from the database, does the time taken to retrieve it vary from 56k connections to T3 connections? or does it all depends ont he general server speed/amount of connections on the db?

im not sure if ive explained that in the best way for people to understand
but im sure someone will get what i mean




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Related Forum Messages:
Query Execution Time
I m using inner join where there is no keys (Primary and foreign). I want to know that Does key affects execution times?

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How To Get Time Execution Of A Query?
Do you know how to get the time that a query executes? Is there a formula on how to get it?

Example:

Note: I have 5000 data in the table cars

$result = mysql_query("Select * from cars");

Question: How to get time of executing the query above?

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How To Get Query Execution Time
How to get query execution time in "mysqlquery.log" files

I am using:

Linux 7.3
mysql 4.1

How to display the query execution time for each and every query in log files.
i have configured "slow-log-query" and "mysqlquery.log" in "my.cnf" is pasted below.

log = /var/lib/mysql/mysqlquery.log
log-slow-queries = /var/lib/mysql/slowquery.log
long-query-time = 0
slow-launch-time = 1

then i can get a output in "mysqlquery.log" like,

070830 9:24:29 2 Connect root@localhost on
2 Init DB jbdatabase
2 Query select count(*) from vacancy1_table
2 Query select category,listcategory from category_t
able order by category
2 Quit


but i need to display the "timetaken of each end every executed query" along with the query in the above logfile like,

E.g:select category,listcategory from category_table order by category(0.03 secs).

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How To Get A Query Execution Time?
How to get a query execution time?

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Last Query Execution Time
Is there a way to retreive the elapsed time for the prevously executed query?

Alternatively, Is there a way to query the current time in fractions of a second?

I am attempting to use a stored procedure to execute and track the time it takes to run some queries and other commands.

The logic of the stored proc would go something like this.....

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Query Log With Execution Time?
I have developed a big property portal web site and have probably written about 1000 different SQL queries in the process (OK, maybe only 500 or so) but a lot.

The site is now gaining popularity and although it is on a dedicated server I want to make sure that everything is running smoothly. I have optimised several tables with indexes etc. and have sped up certain tasks, but would like to know if there are any other queries that take too long and should be optimised.

Is there a way to log all queries together with the time it took to execute the query? Is this already logged and if so - where is it?

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Query Execution Time In PHP Script
I am interested in displaying the query execution time as mysql does from the console, but using php. I've looked everywhere for this and can't find anything. Does anyone know how to display this information to the browser via php? The information must be there since the console provides it.

I checked the php function mysql_info(), but that only shows records, duplicates, deleted, matches, changed, warnings, etc. Didnt see any specific php function for getting execution time.

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Query Execution Time & Mysql_stat
I am using mysql for my shopping site,Performance of site very slow then I used mysql_stat php function to find out how many slow queries,it shows 20.

Now my question is any function in mysql(or)PHP to show 20 slow queries.

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Query Total Execution Time
How to get total time taken by a query to execute....

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Measure Execution Time Of Mysql Script
I am trying to measure the total execution time of a mysql script that I run using the mysql command line client in batch mode (-e "source myscript"). The --tee option does not work for the batch mode so that I could then gather and add up the execution times of the SQL queries as logged by the server.

Adding a tee command in the script itself is not working. Using the time command (in Linux , and timex is not available) on the mysql program is also not helpful as I think it does not include the execution time of the queries on the mysql server side, but only the system and user times corresponding to the client process.

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Time Based Reservation System - Only 1 Query Should Succeed
a user can select a time they want and submit the page

* The code selects all the bookings for a range of time.
* It then counts how many concurrent bookings there are for each hour.
* If there's less than the total (4) it inserts another row ( the user's requested booking ) into the booking table.

We also notify people if there has been a cancellation

This has led to a situation where a few different people are trying to book the same session at the same time, and succeeding!
We've ended up with 5 sessions booked

In the course of 2 page requests this seems to happen:
User1 - submits their booking
site selects to see if there's availability ( there is!)
User2 - submits their booking
site selects to see if there's availability ( there still is!)
site inserts User1's booking
site inserts User2's booking

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Execution Time
After we execute a statement in mysql, it reports the query execution time in the format: n rows in set (t sec).

We may do something like this to get the execution time:
$time_start = getmicrotime();
mysql_query( "" );
$time_end = getmicrotime();
$time = $time_end - $time_start;

But it includes extra CPU time to run two getmicrotime() functions and one subtraction.

Is there any way to obtain the execution time directly from mysql without running extra functions or calculations?

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Improve The Execution Time
i am new to db2 want to ask questions about the performance of my sql commands for a view based another 3 views

the sql commnads are as following:

create view b_central_subgroup as
select communicator as central_member, project_id as project_id
from b_normalized_communicator
intersect
select initiator as central_member, project_id as project_id
from b_normalized_initiator
intersect
select monospeaker as central_member, project_id as project_id
from b_normalized_monospeaker

it takes 4.4 seconds to execute this sql.

it likes that the time is the summ of the other three views.

Can the execution time be reduced through some other methods?
If it is possible , then how ?

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Measure Execution Time
I would like to measure the execution time of my queries in order to evalutate the performance in/decrease for different changes. Even if I use 'sql_no_cache' the query executes MUCH faster the second time I run it, and is therefore not representative of the true performance. How to I avoid this problem?

I'm using MySQL 4.1 on a windows server 2000. I be glad to get an explanation to why the query executes faster the 2nd time.

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Execution Time Of Queries
Approximately how much time would it take to execute a 3 column fulltext table with one million (plus) rows?

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Maximum Execution Time Of 300 Seconds Exceeded (was "MYSQL Error")
I have a huge database 400mb+ in size which i have exported into a .sql file. I tried to run this export script into a new database and it runs fine until three quarters into the scripts execution and the following error appears:

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '<br / >
<b>Fatal error</b>: Maximum execution time of 300 seconds exceeded in <b' at li ne 1
I believe this error may relate to "delayed_insert_timeout = 300". How do I increase this limit in mysql - maybe it may solve the problem but then again it may not .

Any advice is most gratefully appreciated - As you can imagine if the script runs fine for 3/4 of it and then an error appears, stating the error is on line 1, it will take me days to go through the whole script (hundreds of thousands of rows) to find the error as I assume the error does not reside on line 1 as this line would have been executed.

I am running the script on mysql 5, and via source /path/****.sql on linux.

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Database Size And Max Execution Time
I have now got a large database that is getting to a size of about 4Mb when downloaded (dumped / uncompressed).On my Web server everything seems fine. But when using said database on my home server (localhost) I am recieving Max Execution time of 30 second errors constantly.How can I stop this from happening and is it likely to start happening on my web server soon?

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Selecting Based On Time Range
I'm writing a series of queries on a transactions table. I'd like to find all transactions from:

Today
Yesterday
Last Week
Last Month
This Year

The table contains a datetime field called txn_timestamp. What is the appropriate code to filter the table for each time window?

SELECT transaction_id FROM transactions WHERE <?>

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Query Execution Status
How can we know that , the last executed query status like executed successfully or not.

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Query Execution Too Slow!
I have migrated from MySQL 4.1.22 to MySQL 5.0.45. Many of the queries that were working on my old server is working too slow in my new server(MySQL version 5.0.45).

I am not aware why is this happening. Actually there is no error message or query failing. The query is executing, but the time taking to execute the query is too long. This problem is not occurring for all queirs, but only for some complex queires, that is queries with Left Join or Right Join, Group By etc.

I have also checked the MySQL details through SSH(that is by mysql> SHOW VARIABLES;)

Now one thing I found is there is lot of difference in key_buffer_size, table_cache, join_buffer_size, read_buffer_size, read_rnd_buffer_size , table_cache etc between my new server MySQL and old server MySQL.

Will this be the reason for query execution taking too much time.

Can any one guide me why this is happening. The striking thing is that these quires was working very much fine and faster in my old server.

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Slow Query Execution
Right now I am fazing one issue which is getting hell out of me. I am explaining the issues step by step.

1.I have one site running from last 3 years with large database and there is one main table which has maximum load.

2.Now, I have redesigned the site with lots of changes within this table too.

3.The problem is that the server is same, queries are same but output in the new database is taking 50 times more execution time.

4.I also just copy paste the table, and fire the same query... Strange even that is not working...

Is it something where newly added table or database is having issues in the server?

I have tried all, compared the structures of the data and table but still the query result is too slow on live testing sever. While same query in main site of same server is running perfectly.

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Report Of Query Execution Times
Does mysql have a tool to record and report a list of all queries executed and how long it took to execute each query? If not can anyone suggest a tool I can use to do this?

I've heard of mysql query profiler but does it capture queries from all sessions?

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How To Save Accounts Based On Variable Amounts Of Time
I'm currently building a website where users can signup for various accounts.
An account may last 30 days, 12 months or 24 months.
If a user's account is about to expire, an email notification is send, via a CRON Job.

I want to save the different account types in the database, but I'm not sure how to save the duration of an account. If it was all months, I could simply save &#3912;' or &#3924;' as an INT, but it also has an account for 30 days, which is more flexible.

Edit:

It would also be nice if I could ORDER BY duration..


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Slow Query Execution With Strange Issue
Right now I am fazing one issue which is getting hell out of me. I am explaining the issues step by step.

1.I have one site running from last 3 years with large database and there is one main table which has maximum load.

2.Now, I have redesigned the site with lots of changes within this table too.

3.the problem is that the server is same, queries are same but output in the new database is taking 50 times more time.

I have tried all, compared the structures of the data and table but still the query result is too slow on live testing sever. While same query in main site of same server is running perfectly.

Have any one fazed such and issue? Please help me out of the situation as site is ready but I m not able to put new version live.

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Check Query For Syntax Prior To Execution
I was wondering if it was at all possible to check an SQL query prior to execution for syntax errors?

A method which wouldn't alter the data to which the SQL statement related to.

I'm guessing you could perform a transaction of sorts, but is there another way?

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Slow Execution For A Left Outer Join Query
Whats likely to be the cause of slow execution for a left outer join query?

The original query joins three tables but even if I narrow it down to one it still takes a long time to execute.

$query = "select distinct materials.* from materials";
$query .= " left outer join materials_products on materials.material_id = materials_products.material_id";

There's 914 rows in the materials table and 1348 row in the materials_products table

Is it likely to take a long time for this amount of data or is there likely to be a problem in the table(s) set up or query?

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Query Based On Results Of A Previous Query
So far I have managed to construct one query which gives me all individuals that have one of three titles.

based on this I now want to find all the individuals that are affiliated to those listed in the first query ....

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Generating DAILY Min&amp;Max Over A Period Of Time, Based On A "DateTime" Field
how to print the minimum and maximum of a specific field, between two datetimes (both having the time 02:00:00) - so I did this:

WHERE ((tblvalues.dtLPDateTime)>="2006-01-01 02:00:00" And (tblvalues.dtLPDateTime)<"2006-01-03 02:00:00"))

Now I want to print those min and max values but for each day in this cycle, i mean, for this example, there would be two records like:
Day Min Max
2006-01-01 02:00:00 -> 2006-01-02 02:00:00 | 40 | 59
2006-01-02 02:00:00 -> 2006-01-03 02:00:00 | 49 | 68
where at this point i`m getting min=40 and max=68

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Union Based Upon First Query
I have a query that I would like to use a union statement in to grab the number of replies to a specific thread. The initial topic thread is in a different table, which I am grabbing in the initial query... I would prefer to do this in the single query, however I supposed I could do a separate loops and grab the number of replies with a totally distinct query ....

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Mysql WHERE Condition Execution
I have 2 columns and I search rows with two conditions.

SELECT * FROM table WHERE A = '$a' AND B = '$b'

How can I make mysql search columns with A condition first and after
that within these condition B.

I would like to know, how mysql search works.
How can I tell mysql how to search?

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Mysql Execution Sequence
I need to retrieve the last value from a column in a mysql table, perform some actions on it, then add 1 to the original value and store a new entry.

I am worried that if multiple users access the database at the same time I will end up with duplicated 'new values'. Does mysql complete execution of a script before it allows access to another user or do I need to 'lock' the table in some way while the script executes?

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Creating A Query Based On Dates
I am trying to write a query (in PHP) which selects from a database all of the items which are in the future. My query is as follows

SELECT * FROM news WHERE ((news.date)>$today ORDER BY date

where news is my database, news.date is the the field which holds the date for the item and $today will be replaced my current date. At the moment it seems to display all values, which suggest its not functioning properly.

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Query Based On 'does Not Exist' Condition
Let's say I have a table called 'forumtopics' with a field representing the topic author's username. I then have another table called 'ignorelist' which has two fields; one is an account number and the other a reference to the aforementioned author. There can be many ignored authors for any one account.

For any given account number, I'd like all the rows from the forumtopics table where there is no match for (account, author) held in the ignorelist table. Obviously it's easy to check for existence but can the opposite be done?

I run MySQL 4.0.17.

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Sub Query - Aggregate Fields Based On Min N Max
In the Users table below there are duplicate users by email address
+---------------------+------------------------------+-----------------+-----------+
| ts | email | field1 | field2 |
+---------------------+------------------------------+-----------------+-----------+
| 2009-01-31 06:51:14 | user1@rediffmail.com | 05 | 03
| 2009-01-31 16:07:39 | user2@yahoo.com | 02 | 02
| 2009-01-31 16:15:02 | user2@yahoo.com | 09 | 04
| 2009-01-31 16:16:00 | user2@yahoo.com | 06 | 08
| 2009-01-31 16:19:52 | user2@yahoo.com | 01 | 09
| 2009-01-31 02:04:36 | user3@rediffmail.com | null | 01
| 2009-01-31 02:12:34 | user3@rediffmail.com | 01 | 03
| 2009-01-31 02:20:31 | user3@rediffmail.com | 08 | null
+---------------------+-----------------------------+--------------+-----------+

I want to fetch one record per user ‘user1,field1,field2’
For user 1
select field1 where min(ts)
select field2 where max(ts)

the final output should be
user1,05,03
user2, 02, 09
user3, 01,03 (max of ‘field2’ is null so it should pick the field value which matches the next min ‘ts’ val)

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Query Based On Data Of 3 Tables
this is what I've been trying to implement:

I have, say, three tables.

One is a user table, with id, username, etc
Second is a question table with Question ID, Question, Category etc
And third is an "answers" table that keeps answers given by the users. It has the classic id key, and Question id and User Id columns.

What I want to do is this:
Select a random question of category 1 lets say from the questions table for which user X has no record of answering in the answers table.

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Totals Query Based On Days
If I have a table with a ProductID, Quantity, & DateTime field, & would like to have the sum of the Quantity calculated per product per day with blank days being accounted for even if zeroed out, how would I go about accomplishing this in one query?

Example result for ProductX:

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Conditional Select Based On Query Results
I want to print a different message on the database, if a query returns an empty set and a different if the query returns any records. How can i accomplish that? I looked at the case statement but i can't get it working with that.

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How To Query Multiple Tables Based On Value Difference
I 5 tables all with equal columns,but with different values. Per example:

time_start,time_end,num_a,num_b,price etc.

How can I retrieve the values of all columns `price` between tableX and tableY where time_start in table Y is higher as a datetime than time_start in X.
So,the query is about finding the values of `price` between 2 dates in differnt tables.

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Query Which Gets Rows Based On A Radius, Lon And Lat Doesn't Work?
I have found this query which gets rows based on a radius. I need this for zip codes based on lon and lat's.

$sql2 = "SELECT * FROM table as z WHERE (SQRT( (69.1 * (".$userLat." - z.lat)) * (69.1 * (".$userLat." - z.lat)) + (53.0 *(".$userLong." - z.lon)) * (53.0 *(".$userLong." - z.lon))) <= ".$userRadius." )";
return $sql2;
$res = mysql_query($sql2, $connDB) or die(mysql_error());
$row = mysql_fetch_assoc($res);
based on a test zip code gives a result like


SELECT * FROM table as z WHERE (SQRT( (69.1 * (52.399834 - z.lat)) * (69.1 * (52.399834 - z.lat)) + (53.0 *(4.840762 - z.lon)) * (53.0 *(4.840762 - z.lon))) <= 100 )
the lat and lon of the test zip code are right. As you can see z.lat and z.lon don't get any value. And these would be every lat and lon in table.

In my db table lon and lat are decimal(10,6) type with a default value of 0.000000

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Howto Make A Query Based On Another Result?
I need to make query from another query result.

tbl_A
fields: ID and Date

tbl_B
fields: ID and FileName

Code:
Select ID FROM tbl_A where Date>=CURDATE()
this 1st_query_result will be any ID with current date from tbl_A.
Then I need this 1st_query_result to query the filename which store at tbl_B.

something like this:

Code:
select FileName from tbl_B where ID = 1st_query_result

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Mysql Shuts Down During Rapid Execution Of Querys
I am using version 4.0.12-nt of MySQL and when I hit the enter key
rapidly I can't connect to the database. The result is a message is
returned to me from mysql that says I can't connect because the
database is down. If I only hit the 'enter' key once (to execute the
page that my queries are on(their are four queries on this particular
web page)) my queries execute just fine.

We have noticed that this only happens when we:

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Determining Which Table To Query Based On Data Within Tables
I have 2 tables:

default_categories
column 1: category_id
column 2: category_name
column 3: category_parent

custom_categories
column 1: custom_cat_id
column 2: custom_cat_name
column 3: custom_cat_parent

The custom_categories table won't necessarily have anything in it but if it does, I need to choose the data from the custom_categories table over the data from the default_categories table.

So if the default category has 3 rows with IDs | names:
123 | Dogs
456 | Cats
789 | Fish

And the custom category has 1 row with IDs | names:
456 | Very Cute Cats

I want my query of these 2 tables to produce the following IDs | names:
123 | Dogs
456 | Very Cute Cats
789 | Fish

I've tried joins like the one below but they aren't working because if there is no custom_cat_id, it won't give me the result for the default category_id.


MySQL
SELECT *
        FROM default_categories
        LEFT JOIN custom_categories ON category_id = custom_cat_id
        WHERE category_parent = ''
        AND custom_cat_parent = ''
        ORDER BY $order_by $sort




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Query For Month Data Based On Occurance Against Master List
I have a query running nicely. Now I'm trying to expand it.

It pulls the data from a table based on matching the id with another table and part of the grouping is by month and 2 other criteria. Now I'm trying to get the data pulled by month to pull only the info where the id matches the master file AND the FRANID's pulled are the same for each month. I'm trying to get a comparisson across times, but not every month has all FRANID's, depending on when they were entered and I ony want data that exists with matches over set months, starting for now with 12, perhaps also for 6 and 3 next time.

I've simplified what I'm doing above, but it is detailed below.....

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Can't Connect To MySQL Server On 'localhost' (10061) On Script Execution
Whenever I run this script:

<?php
$mysqli = mysqli_connect("localhost", "root", "rootnow");

if (mysqli_connect_errno()) {
printf("Connect failed: %s
", mysqli_connect_error());
exit();
} else {
printf("Host information: %s
", mysqli_get_host_info($mysqli));
mysqli_close($mysqli);
}
?>


I get this error message:
Connect failed: Can't connect to MySQL server on 'localhost' (10061)

I'm running Apache 2.0.58 with PHP 5.1.4 and MySQL 5.0.20 on Windows XP Home Edition.

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ORDER Based On One Field But LIMIT Based On Another?
Say I have a table with students and their grades, and I want to get the students with the top 10 grades, but the result to be sorted based on their name. How would I do that?

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PHP/MySQL Sorting By Date & Time (using Non Military Time)
This is probably a simple issue but I have searched online and can't find an answer.

I am using PHP/MySQL and I guess the most intuitive would be to have three select boxes containing HOUR / MINUTE / AM,PM option. Then store the time into mysql using there functions so I can output the data sorting them all by date and time. All the examples I have seen are for military time only but I'm sure there has got to be a simple mysql function or php function that converts non military to military and a formatting function to display with the AM / PM. But I have not found it.


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Query Time
Is there a function out there to determine the length of time a particular query took

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Get Query Time Query Time Using PHP
I just want to ask, how to get query time like this one:

SELECT f_name, l_name from employee_data where f_name = 'John';

+--------+------------+
| f_name | l_name |
+--------+------------+
| John | Hagan |
| John | MacFarland |
+--------+------------+
2 rows in set (0.00 sec) <- This Time <--

Maybe some instruction using PHP?

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