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Measuring Query Times


I have read a few posts here and see that some people have questions regarding the length of time it can take to perfrom their queries.

I would be quite happy reaching that stage because at least I would know how long mine take. :|

How can the time delay be forced to output? Using MySQL 5.0.




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I'm trying to write a backup script, but want to be 'resource smart' about it. I'd like to backup my database every hour or 2, but want to look at the current draw on the DB prior to running the backup. If the draw is within pre specified limits, do the backup, otherwise, sleep for a min then try again.
This may be more of a job for a shell script, but I figured I'd give the mysql forum a try.

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Large Query Times
SELECT distinct column1 FROM table1, table2 WHERE column1 <> column2 ....

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Report Of Query Execution Times
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I have two querys right now, but honestly don't really know what I'm doing. And I'm assuming I have to increment viewcount everytime that query gets executed.

This query looks up the review:

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Query Single Table, Multiple Times
Before i narrate my issue, i would like you to preview my table structure :

Table name = machine_info

+------------+----------+------------+
| machine | tag_name | tag_type |
+------------+----------+------------+
| machine101 | sge | farm |
| machine101 | US | site |
| machine101 | CRITICAL | status |
| machine102 | CANADA | site |
| machine102 | UP | status |
| machine102 | sge | farm |
| machine103 | CHINA | site |
| machine103 | DOWN | status |
| machine103 | sge | farm |
| machine104 | US | site |
| machine104 | CRITICAL | status |
+------------+----------+------------+

Requirement :

I would like have machines from all 'sites' (almost 15 in the actual db) with

1)status='DOWN'
2)status='CRITICAL'
3)status='UP'

Example: (Here the results would be like)

SITE|DOWN|CRITICAL|UP
US |0 | 2 | 0
CANADA|0|0|1
CHINA|1|0|0

I use php to extract information, here's what i do :

<?php

$db = mysql_connect("hostname", "user", "password")
or die(mysql_error());

$selected = mysql_select_db("dbname") or die(mysql_error());

$site_codes = mysql_query("select distinct(tag_name) from machine_info where tag_type='site';");

echo "SITE|DOWN|CRITICAL|UP
";

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Appear 2 Times
i'm having this problem finding out the right sql query.
i have two tables A & B
the userid in table A appears as FK in table B
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how do i go about it>?

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Comparing Times
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To get the length of time I was gonne use:

HOUR(TIMEDIFF(NOW(),time))

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Number Of Times
I have a query that grabs 500 rows from 1 field within 1 table.

In this table. Each user will have 500 rows associated to them from within that table. So if there are 2 users then there will be 1000 rows. Each time 1 user executes the query, it grabs their 500 rows. If 2 users execute the query simultaneously, then this means that there are 1000 rows, all of which will be selected; 500 by one user and 500 by the other. If 3 users access the table simultaneously, then there are 1500 rows and so on. My question is how many users can execute this query simultaneously before we see performance loss?

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Records Between Two Times
I have a table for a restaurant database with two fields open_time and close_time in TIME format. I want to be able to select all records that fall between open_time (when the restaurant opens) and close_time (when the restaurant closes).

I have this query:
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It partially works, but its not working if the close_time is after midnight (i.e 1am = 01:00:00 in database). I can't figure out the issue with the difference between AM and PM.

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One To Many Multiple Times
I have a 'links directory' database that currently contains 4 tables: category, subcategory, region and links. My links table contains company names and, among others, three fields catID, subcatID and regID. Each of these are related to primary keys in the other three tables, category (catID), subcategory (subcatID) and region (regID).

My issue is that the records in the links table can be in multiple regions, multiple subcategories and multiple categories, but the way I have it designed, each record in links can only be associated with a single catID, subcatID and regID.

Currently the only workaround I can think of it to have duplicate entries in the links table for a single company, but with every variation of catID, subcatID and regID. This will result in a very large table, but I cannot currently think of any better idea.

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Dates And Times.
You can't have two timestamp columns in a database both with the default now().
- why I would want to is not the issue.

You can't use the data and time functions, such as CURRDATE()/CURRTIME() provided by MySQL as defaults for date/time type columns.

Is there a way to use something like 'select currtime();' as the default for a column?

so my question is, how do I use ANYTHING other than one timestamp with the default value of now() for date/time defaults in MySQL.

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Run-times On SQL Commands
Does anyone know where I could find explanations/descriptions of runtimes on sql commands like select and functions like max(). In other words if these are linear functions/commands or log based?

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Dates And Times
I have a field in a DB called "customerJobDate" which is configured to store full dates (ODBC dates) e.g. "2006-03-06 08:30:00". Now this does work i can update insert and delete the records perfectly, But if i query the DB asking for all dates that match 2006-03-06 regardless of the time (Date only) then the result returns 0 rows unless any of the dates in the column have 00:00:00 as the time.

This works: 2006-03-06 00:00:00
This does not work 2006-03-06 08:30:00

I hope someone can help me as I am finishing this app and this is the only thing holding me back.

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Upload Times
I need to upload 2 star catalogues to the mysql database. the first time i tried this i filled up the HD in 2 Days, my instructor mentioned that journalling was taking up most of the space and decided to remove-it.

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my question is, does journalling speed up writing data into mysql tables? i have roughly 180GB of data to upload, and it took me 4 days to upload 3GB's when last time it took me this time to upload 100GB.

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About Dates And Times
I have form with drop down boxes, where folks enter dates and times, I have used implode and explode to format the dates, now I want to write those dates to mysql, I know mysql has its own date and time functions, is there a way to convert my php formatted dates and times into something that mysql will recognize and store as a time and date or does php have a function that will convert it and then allow it to be stored in date/time format in the database?

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Ordering Times
i have some vlaues in a database, they are 12 hour times, how would i go about sorting it so 12 comes before 1, as it is its going 1 2 3 4.... 12 etc etc, do i have to use a 24 hour time? then from there function it to show 12 hour when displayed

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Export Records Times Out
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Joining Mutiple Times
I have the following situation and I can't figure out what method to use.

I have a table with items, for these items I want to know which user inserts a row and I want to know who updates a row. In the table I store both user-ids.

The user information is stored in an other table.

How can I link both user names to the one row in the items table?

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Left Join 2 Times
SELECT f.id as id, f.forum_name as forum, f.forum_desc as description,
count(forum_id) as threads, u.name as mod
FROM forum_forum AS f
LEFT JOIN forum_posts AS p
ON f.id = p.forum_id
AND p.topic_id=0
LEFT JOIN forum_users AS u
ON f.forum_moderator = u.id
GROUP BY f.id

Output: 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 'mod FROM forum_forum AS f LEFT JOIN forum_posts AS

Does this query contain any syntax errors? Can mysql perform left join 2 times?

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Can't Connect At Peek Times
Can't connect to local MySQL server through socket '/tmp/mysql.sock'

error raise when website peek time, current using 3rd party abstract layer, i have checked mysql_pconnect is not in using. anyone know what might cuase this error?

mysqlId setup:
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-locking
key_buffer = 256M
max_allowed_packet = 1M
table_cache = 512
sort_buffer_size = 1M
read_buffer_size = 2M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 32M
max_connections=10000

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Call To Database Times Out
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I get this message after clicking on "go to checkout"
2013 Lost connection to MySQL server during query in:

[select sum(tax_rate) as tax_rate from (tax_rates tr left join zones_to_geo_zones za on (tr.tax_zone_id = za.geo_zone_id) left join geo_zones tz on (tz.geo_zone_id = tr.tax_zone_id) ) where (za.zone_country_id is null or za.zone_country_id = 0 or za.zone_country_id = '223') and (za.zone_id is null or za.zone_id = 0 or za.zone_id = '12') and tr.tax_class_id = '1' group by tr.tax_priority]
2006 MySQL server has gone away in:

[select count(*) as total from sessions where sesskey = 'd60f1f220b761a5a176738c1a65de4b2']

Warning: Unknown(): A session is active. You cannot change the session module's ini settings at this time. in Unknown on line 0

I've checked with my host, and they are able to do a php call to the database just fine.

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how can I list the queries and how long they each take?

I've done it before but forgot how;

Currently I've got the TOTAL query time on each page but I'd like a more advanced breakdown.

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Struggling With Dates And Times!
I'm using MySQL 3.23 - I know it's old but it comes as default on Linux distribs and I just want something consistent between home, my ISP and work.

I want to work out the time difference between two entries on my database (I'm using PostNuke and have two posts which are stored as integers, ie unix times). I can see that there is now a datediff() and timediff() function but they don't work hence why I mentioned the version I'm using.

Can anyone tell me how to get the difference between two dates - I am assuming I subtract one from the other but don't know how to convert the result into something useful (like days and hours etc) because I'm not sure what the unix time is made up of.

I guess an easier version of that lot is : is a unix time just a second count?

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I am trying to formulate a complex query to get some good info straight from SQL, rather than post-processing in XL.

I have a table as follows:
EventID Integer (key)
ActionID Integer, 1 = event on, 2 = event off
dtStamp Date

I want to get the duration of each Event.

I.e. I need, for each Event:
dtStamp(actionID = 2) - dtStamp(actionID = 1)

I was going to try:

>create view EventOnTime as select EventID, dtStamp as EventOnDtStamp from EventLog where ActionID = 1;

>create view EventOffTime as select EventID, dtStamp as EventOffDtStamp from EventLog where ActionID = 2;

>select eventOnTime.EventID, eventOnTime.EventOnDtStamp - eventOffTime.EventOffDtStamp as EventDuration where eventOnTime.EventID = eventOffTime.EventID;

... but I can't create views with this version of SQL (server version: 4.0.20-standard-log)

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Adding 1 Year To All Times
suppose that

dbX -> tableX

id columnX
1 1190815874
2 1192975748
3 1196695027
4 1196796789

how can i add 1 year all value where year is 2007 ?

my sql do not run

UPDATE `tablex` SET `columnx` = DATE_ADD(`columnx`, INTERVAL 1 YEAR)
WHERE DATE_FORMAT(FROM_UNIXTIME(`columnx`),'%X')) = 2007;

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I have a huge Access database (about 50,000) records. I use Access dumb to create a sql file which I can them go into phpmyadmin and import the records. Well, after a while the process times out. Is there a way I can import large amount of data into MYSQL without timing out?

Also the access database that I convert over gets updated every week. I don't know which records get updated or added. Also the app I am using only works with Access so I can not completely convert over. Is there a way I can update the MYSQL without having to import that huge file again. Maybe something that will not override the records that are same just change the modifed ones and add the new records.

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Disabling An Entry More Then 3 Times A Day.
Like if you enter 3 times a day the same text. It echo's something instead of writing in the database. Do i need to add a date on where the line was added to it?

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Slow Loading Times
It takes more than 30 seconds to load the phpmyadmin page. On a localhost server.
It says
Fatal error: Maximum execution time of 30 seconds exceeded in c:appservwwwphpmyadminlibrariesmysql_wrappers.lib.php on line 101

This sometimes also happens when loading my local website that uses MySQL.
I've tried reinstalling, but it doesnt help.

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I have a datetime field that records date and time. This field records
when rec is created. I also have a timestamp field that records
whenever the record is updated. I noticed that when i first create the
record, the update time is about 3-5 minutes before the create time.
The update time and create time has to be identical. How can one lag
the other? Im executing sql from a php page.

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Trace SQL Queries Date/times
I have a web application connected to mySQL 4.1 database. I would like to know the date/time for the queries executed on mySQL DB when any operations performed from the UI.

Is there any mechanism to trace the information related to any query updates happening on the DB when operations are performed from the UI.

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I have been developing a page that displays survey results data. There are many SQL queries but has worked so far. Recently when I click the link to the page the page times out but if I refresh it displays the data correctly.

Are the results of a query stored so the refresh of the page works quicker?

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Subtraction Of Times Inconsistent On Different Machines
query structured as follows:

SELECT time(c.start_time),
time(c.end_time),
time(c.end_time) - time(c.start_time) as 'opening_hours'
FROM my_shop c;

The data in start and end time is 1970-01-01 09:00:00 and 1970-01-01 17:00:00 respectively.

On my local machine this this query returns:

| 07:00:00 | 19:00:00 | 12 |

However on a remote machine (production) it is returning

| 07:00:00 | 19:00:00 | 120000 |

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Joining A Table Multiple Times
I was wondering if it was possible to join 2 tables on 3 different feilds, but I don't want the 3 feilds to limit my results... I'll try and explain:

Table 1 = "offices"
Table 2 = "employees"

The offices table has the addresses of all the offices and 3 extra feilds "manager", "supervisor", and "employee". (these 3 feilds have a numeric value equal to the primary key in the employees table)

The employees table has the employee information like address and phone number and such.

I would like to write a query that would pull the office name as one feild, followed by "manager", "supervisor" and "employee".

Currently I have this, but it only pulls the employee and I'm not sure how to get the manager and supervisor to be a part of the query:

SELECT CONCAT(office.id_store, ' - ', office.storename) as offices, CONCAT(user.lastname, ', ', user.firstname) as fullname
FROM office LEFT JOIN user ON office.empoyee = user.id_user

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I'm not really sure the best way to explain what I want to do, so I'm going to make a really simple example to illustrate what I mean.

Let's say I have a table with column "temperature". There are 5 entries that contain the word "hot", 3 entries that contain the word "medium", and 2 entries that contain the word "cold". However, these entries are not in any particular order.

Is there a "SELECT * FROM" statement which will return the results by order of popularity in the following manner?:

hot (5)
medium (3)
cold (2)

I have a script I'm working on and I'm trying to figure out the best way to do something like this.

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I've seen this asked before and although someone answered that it is possible, they did not post the solution, so if anyone can enlighten me that would be helpful.

Basiclly with table info


name | quantity
john | 3
anne | 1
will | 2
Return results

john
john
john
anne
will
will

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for example i want to get the recordes between 2007-01-01 23:00:00 to 2007-01-03 03:00:00 ?

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If both conditions are not met in table two, then no results are returned.....

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Entering Future Dates And Times Into Database
What is the proper method for one to insert future dates and times into a database .. Would you need a date picker? And a time picker if there is one?

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Comparing Times With Different Number Of Hour Digits
Why is '100:00:00' > '90:00:00' false

but time_to_sec('100:00:00') > time_to_sec('90:00:00') true?

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Linking Table Entries Multiple Times
I have no idea how to handle certain kinds of relations between tables:

I have a table called 'labels' and a table called 'artists'. Every artist belongs to at least one label, but could also belong to any higher number of them. How would I solve this in my database architecture?

I discarded the idea of simply adding 10 columns called 'label1', 'label2', etc; Also I have found the ENUM and SET datatypes, but the possible values entered there should be set at table creation time which is also not quite what I'm looking for.

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Can I Tell How Many Times A Column Has Been Updated In The Past 2 Weeks?
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Is it possible to find out how many hits an item has received in the past 2 weeks, without altering the structure of the table?

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I'm being given the product id's in order for each category.

Do I have to iterate through the data in PHP and UPDATE the table w/ many SQL statements, or is there one SQL statement where I can provide the list of products to update in order?

I've used MySQL user variables before (e.g. SELECT @m:=0;) but I don't see how I can use it here... Is what I want possible in one query?


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Which Is Faster In MySQL? Comparing Unix Times, Or DATETIMES?
I'm leaning towards using unix times inserted into my MySQL for ease of use in manipulating the data with PHP. I think this will be the final decision, which one would be faster?

--

Mysql:
* INT (4 bytes)
* DATETIME (8 bytes)
* TIMESTAMP (4 bytes)

--

My PHP application does alot of querying from the database to compare specific data within TIMERANGES, so always, I'm querying with "time >" or "time <".

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gallery table:
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thumbnails table:
gallery_id, thumbnail_link

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With several thumbnail entries:
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COUNT() - Get # Runs, # Times >100 Runs Scored
I'm trying to get the following output for cricket players:

Player | Runs | 100s
Jon Doe | 492 | 1

Runs is the total number of runs scored for all fixtures

100s is the number fixtures for which this batsman achieved 100 runs or more.

SELECT
p.player_id,
p.name,

SUM(b.runs) AS runs,
SUM(IF(b.runs >= 100, 1, 0)) AS runs100

FROM players p
LEFT JOIN batting b ON (b.player_id = p.player_id)
GROUP BY p.player_id

Batting table has the following columns:

fixture_id | player_id | runs

At the moment, this seems to report the number of runs correctly, but returns "1" in the 100s column, even though some player haven't achieved 100 runs in total.

Also I am trying to find the number of matches played, above I have simplified the fixture_id in the Batting table. This is actually a compound key between "official" and "fixture_id", the official column is a 1 or a 0.

Ordinarily I would do .....

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How To Refer To A Virtual Table Created By Sub-query In Other Sub-query?
how to refer to a virtual table created by sub-query in other sub-query?

like this:

select ... FROM (select....) as C where xyz=(select ...from C) ..;

it returned error table C does not exist

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Simple Sql Question: Using A Query Result As A Query Variable
EDIT: it works now, I had an error in my code, not my method.

I have a very simple question.

I have 2 tables: 'users' and 'posts' with the following structure:

users: id, username, email_address
posts: id, user_id, post_title, post_text

in a my own mind's mysql, I would like to:

SELECT posts.id, posts.user_id, posts.post_title, posts.post_text users.username FROM users, posts WHERE posts.user_id = users.id

I usually do one query for the post data, and then, based on the use_id record, do another of the users table, but today, I'm being forced to do them in one swoop.

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