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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 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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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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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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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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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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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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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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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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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 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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Time Query - Please Help?
I’m completely baffled by a query that I thought I had working yesterday, but I can’t get it working today.

Here’s the screnario:

I’m publishing a story to the web and I don’t won’t it to be published live until:

-The current date (type: date) is less or equal to now
-The current time (type: time) is less or equal to now

So here’s my query:

select * from cms_stories
WHERE section = 'news'
AND published_web_date <= NOW() OR published_web_date IS NULL
AND (published_web_time <= NOW() OR published_web_time IS NULL)
ORDER BY story_id
DESC LIMIT 1
Now the query works for the published_web_date, but not for the published_web_time. It seems to ignore that as you can see from the screenshot returned below from that query.


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Limiting Query Time
Is it possible to limit the query time in MySQL (3.x or 4.0)? For
example, I'd like to have any query that takes more than a specified
number of seconds just quit automatically. Seems dumb, but on a web
site, nobody is going to wait minutes for a query to return so they
refresh anyway. So on a busy server, MySQL ends up with several queries
running that all take a long time to finish which compound to make it
even slower. A simple time limit would solve the problem. Yes, I know
that the queries should take less time, but again, on a busy server,
sometimes the longer queries do take a long time (10 minutes or more)
to complete.

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Add Time Using A Select Query
Hello, how can I add, say, 2 hrs from a time in a database using a select query. I have searched the forums but cannot find an answer. Is it possible PHP Code:

 select 
date,
`time`                         as timetime
     , time_format(`time','%l:%i %p') as Printtime,
client,
address
from.......... 

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Exceeded Run Time Query
I made a application in PHP, I have a table "control1" and this table have 85000 registries and Size is 200 MB, so when I try do a query in PHP, I have a error "exceeded run time", I changed the time but is the same, and after I connected by console, and I could see that the query take 14 minutes.

Here my sql:

$sql_filtro="SELECT COUNT(*) nFilas FROM control1 WHERE MATCH (contenido) AGAINST ('$q')";

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Execute Time Of A Query
I'm running a SELECT * query on a table with over 3,000 rows. I need to know the execute time on the query.

PHPMyAdmin shows it to me, but because they automatically add a LIMIT 0, 30 I suspect the time is only for those 30 records. It also has a feature to prevent web server timeouts that prevents me from setting the LIMIT to 0, 3100.

BTW, I'm programming in PHP. Does the time to run the query get automatically passed when PHP sends the query to MySQL?

<? PHP
$Query = "select * from my_table where 1";
$Result = MYSQL_QUERY($Query);
?>

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Using Time Functions Within A Query
I'm currently working on a script that searches through a database of restauarant information. One of the things it does is allow the user to search only for restaurants that are open at the time of the search, however i get errors when trying to implement this.

Here is the query im using:

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Take Long Time To Run A Query!
I have a webserver that I just use for a webapplication. PHP, Apache and MySQL is installed on the server.

The size of MySQL database is 10 GB. End inn it is millions of rows.

I wonder where I search what is the normail time the data to return? In my case it takes from 20 sec to 2 min to run a query!

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Time Query Question
I'm trying to pull dates from a db that are newer than 6 months old. I've been testing with 1 day, since there's nothing in the db that's older than 6 months.

query

PHP

$DATEsql = "SELECT DISTINCT DATE_FORMAT(time_in, '%m/%e/%Y') as time ";
$DATEsql .="FROM login ";
$DATEaql .="WHERE time_in > CURDATE() - INTERVAL 1 DAY ";
$DATEsql .="ORDER BY time DESC ";

that is giving me the same results as

PHP

$DATEsql = "SELECT DISTINCT DATE_FORMAT(time_in, '%m/%e/%Y') as time ";
$DATEsql .="FROM login ";
$DATEaql .="WHERE time_in < CURDATE() - INTERVAL 1 DAY ";
$DATEsql .="ORDER BY time DESC ";

This is what I'm interpreting as what I need to do according to the MySql manual.

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How To Query For Multiple Records At The Same Time
Basically let us assume i have a table (table1) with column (column1). I want to select only the records that have column1='x' or 'y' or 'z'. Is it possible to create a standard query that will do that for any number of records?

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Time Zone For Query Browser?
My server time is set to CST. phpMYSQLadmin shows CST.
The website that the information is stored on is CST.

When I do a query from MySQL Browser, it's providing information back in GMT.

Does the browser undo timezone? It makes since on a corporate level, so that the time is always being pulled up correctly.

So, my question is. If all my servers and sites are all set to CST, do I still need to do queries with a time zone change in it, CST?

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TIMESTAMP :: Query By Time And Date
I have a field in my table that holds a timestamp. Below is a pseudo-query to describe what I would like to do.

SELECT * FROM `mytable` WHERE `saved_date` <= `6/24/05 10:22:34 AM`

`saved_date` is the field holding a TIMESTAMP. If anyone could give me the query that would actually do what I am trying to do above,

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Query For A Specific Amount Of Time...
I was wondering if there was some possible way to display a mqsql query for an exact ammount of time?

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Average Query Execute Time???
I have a query taking about 4 sec that gets only 18 records.. That's not good. What can I do to speen up my Query?
<CFQUERY DATASOURCE="#datasource#" NAME="qry_job_search">
SELECT DISTINCT (t1.JobPostId), t1.Actionlkp, t1.Date,
tbl_job_posting.*,
tbl_job_post_requirements.*,
tbl_employer_info.*,
tbl_employer_url.*,
tblkp_employment_type.*,
tblkp_education_exp_lvl.*,
tblkp_salary_range.*,
tblkp_employment_exp_lvl.*,
tbl_job_post_location.*,
tbl_job_post_job_categories.JobCat,
tblkp_countries.*,
tblkp_prefectures.*
FROM tbl_job_post_history AS t1
JOIN tbl_job_post_location
ON tbl_job_post_location.JobPostID = t1.JobPostID
JOIN tblkp_countries
ON tbl_job_post_location.CC1 = tblkp_countries.CC1
JOIN tblkp_prefectures
ON tbl_job_post_location.CC1 = tblkp_prefectures.CC1
AND tbl_job_post_location.PrefectureID = tblkp_prefectures.ADM1
LEFT JOIN tbl_job_post_requirements
ON tbl_job_post_requirements.JobPostID = t1.JobPostID
LEFT OUTER JOIN tbl_job_post_job_categories
ON tbl_job_post_job_categories.JobPostID = t1.JobPostID
JOIN tbl_job_posting
ON tbl_job_posting.JobPostID = t1.JobPostID
JOIN tbl_employer_info
ON tbl_employer_info.UserID = tbl_job_posting.UserID
LEFT JOIN tbl_employer_url
ON tbl_employer_url.EmployerID = tbl_employer_info.EmployerID
JOIN tblkp_employment_type
ON tblkp_employment_type.ID = tbl_job_posting.EmploymentType
JOIN tblkp_education_exp_lvl
ON tblkp_education_exp_lvl.ID = tbl_job_posting.EducationExpType
JOIN tblkp_salary_range
ON tblkp_salary_range.ID = tbl_job_posting.Salarylkp
JOIN tblkp_employment_exp_lvl
ON tblkp_employment_exp_lvl.ID = tbl_job_posting.EmploymentExpType
WHERE t1.JobPostId NOT
IN (
SELECT DISTINCT (JobPostId)
FROM tbl_job_post_history
WHERE Actionlkp =4
AND date = (
SELECT MAX( date )
FROM tbl_job_post_history
WHERE JobPostId = t1.JobPostId )
AND JobPostID = t1.JobPostID
)
AND HistID = (
SELECT MAX( HistID )
FROM tbl_job_post_history
WHERE JobPostID = t1.JobPostId
AND Actionlkp =1
)
AND Date >= ( curdate( ) - INTERVAL 30 DAY )

<CFIF SESSION.COUNTRY_A NEQ "" AND SESSION.PREFECTURE_A EQ 0 AND SESSION.CITY_A EQ "">
AND tbl_job_post_location.CC1 = '#SESSION.COUNTRY_A#'
<CFELSEIF (SESSION.COUNTRY_A NEQ "" AND SESSION.PREFECTURE_A NEQ 0 AND SESSION.CITY_A EQ "") OR FORM.PREFECTURE NEQ 0>
AND tbl_job_post_location.CC1 = '#SESSION.COUNTRY_A#'
AND tbl_job_post_location.PrefectureID = '#SESSION.PREFECTURE_A#'
<CFELSEIF SESSION.COUNTRY_A NEQ "" AND SESSION.PREFECTURE_A NEQ 0 AND SESSION.CITY_A NEQ "">
AND tbl_job_post_location.CC1 = '#SESSION.COUNTRY_A#'
AND tbl_job_post_location.PrefectureID = '#SESSION.PREFECTURE_A#'
AND tbl_job_post_location.PostCity LIKE '%#SESSION.CITY_A#%'
</CFIF>
<CFIF (SESSION.CATEGORY_A NEQ 1) OR FORM.CATEGORY NEQ "">
AND tbl_job_post_job_categories.JobCat = '#SESSION.CATEGORY_A#'
</CFIF>
<CFIF (SESSION.KEYWORD NEQ "") OR FORM.KEYWORD NEQ "">
AND t1.Actionlkp = 1
AND (tbl_job_posting.JobTitle
LIKE '%#session.Keyword#%'
OR tbl_job_posting.JobDescription
LIKE '%#session.Keyword#%'
OR tbl_job_post_requirements.JobRequirements
LIKE '%#session.Keyword#%')
<CFIF SESSION.KEYWORD NEQ "" AND SESSION.PGV NEQ "brief">
<CFSET SESSION.PGV = "detailed">
</CFIF>
</CFIF>
<CFIF SESSION.EMP_TYPE_A NEQ 1>
AND tbl_job_posting.EmploymentType = '#SESSION.EMP_TYPE_A#'
</CFIF>
<CFIF SESSION.EXP_LVL_A NEQ 1>
AND tbl_job_posting.EmploymentExpType = '#SESSION.EXP_LVL_A#'
</CFIF>
<CFIF session.SRT EQ "D">
ORDER BY Date DESC
<CFELSEIF session.SRT EQ "C">
ORDER BY tbl_employer_info.CompanyName
<CFELSEIF session.SRT EQ "L">
<CFIF form.country NEQ 0>
<CFIF form.prefecture NEQ 0>
<CFIF form.city NEQ 0>
ORDER BY tbl_job_post_location.PostCity
</CFIF>
<CFELSE>
ORDER BY tblkp_prefectures.FullNameS, tbl_job_post_location.PostCity
</CFIF>
<CFELSE>
ORDER BY tblkp_countries.CC1, tblkp_prefectures.FullNameS, tbl_job_post_location.PostCity
</CFIF>
<CFELSEIF session.SRT EQ "T">
ORDER BY tbl_job_posting.JobTitle
</CFIF>
</CFQUERY>
Can anybody see a shortcut to get the same results??

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Comparing Dates Y, M, D , Time In Sql Query
ok.. ive finally got my nice little calender setup to output my dates

now

how do i query my database

for example ive got 2 variables
$startdate = 2006-1-1 00:00:01
$enddate = 2006-1-1 23:59:59

these represent the 1st and last second of the first of january 2006

i have a cell in my table (table called challenges) ( cell called time) that contains a date in the same format for each entry

how do i get all the entries between the start time and the end time..

can i use less than < and more than > as these are not really integar values

the column type is datetime but there is also another column of type datetime

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Query Takes A Long Time
On my site I have a query that searches through 1,7 million. The php-file with the query takes a bit of time to load. Is it possible to show some sort of progress-bar during this time?

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Any Tips For Improving This Query Time?
Is there anything I can do to improve execution time for this query?

mysql> SELECT webpageUrl, webpageName, COUNT(*) AS `count` FROM _1_log GROUP BY webpageUrl ORDER BY `count` DESC LIMIT 5;
+---------------------------------------------------------+---------------------------------------------------------------+-------+
| webpageUrl | webpageName | count |
+---------------------------------------------------------+---------------------------------------------------------------+-------+
| http://www.w3counter.com/ | W3Counter - Free Web Counter, Web Stats, Live Analytics | 2490 |
| http://www.w3counter.com/stats/visitors/4071/day/1000/0 | Visitors Overview - www.pitbullmortgageschool.com/ | 1496 |
| http://www.w3counter.com/stats/4071/v_daily | W3Counter - Visitors by Date - www.pitbullmortgageschool.com/ | 1130 |
| http://www.w3counter.com/stats/ | Your Websites | 1124 |
| http://www.w3counter.com/stats/websites | W3Counter - Websites | 800 |
+---------------------------------------------------------+---------------------------------------------------------------+-------+
5 rows in set (0.88 sec)

mysql> explain SELECT webpageUrl, webpageName, COUNT(*) AS `count` FROM _1_log GROUP BY webpageUrl ORDER BY `count` DESC LIMIT 5;
+----+-------------+--------+------+---------------+------+---------+------+-------+---------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+--------+------+---------------+------+---------+------+-------+---------------------------------+
| 1 | SIMPLE | _1_log | ALL | NULL | NULL | NULL | NULL | 29422 | Using temporary; Using filesort |
+----+-------------+--------+------+---------------+------+---------+------+-------+---------------------------------+
1 row in set (0.00 sec)
It averages 0.5-3 seconds throughout the day (it's run often enough that it shows up in my slow query log multiple times an hour for exceeding 1 second).

Adding a partial index on webpageUrl doesn't affect anything, and URLs can be quite long. Is there anything I can do to speed up that query? The table is updated too often to maintain separate url/count tables -- can't spare the resources.

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Looking For Query To Get Time Of Last Column Count Increase
Code:

id | time | units
------------------------------------
1 | 2009-01-06 06:52:32 | 50
1 | 2009-01-02 16:45:23 | 50
1 | 2009-01-02 09:12:16 | 40
1 | 2009-01-01 12:06:00 | 35
2 | 2009-01-04 14:52:30 | 259
2 | 2009-01-04 04:52:30 | 258
2 | 2009-01-03 18:00:01 | 258

I need to write a query that will, for each unique id, return the last time there was an increase in the "units" column. So for this data set, I want to see:

Code:

id | time
------------------------------------
1 | 2009-01-02 16:45:23
2 | 2009-01-04 14:52:30

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Time Out Message When Query Large Tables
I'm trying to get data from 6 large tables but the volume of data in each table is too large and even select * from one of them make the system stop. I have afew questions:

1-what can I do to avoid the system stop or time out message?

2- To use several tabels infomation should I use 'View' command or can I use other methods?

3-I need to create a new table and insert the result from query in it. If I use the "view" can I insert the result of the view in a table?

(I use postgresql).

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Query To Display A Record By Recent Time
Many users uploaded their files to my mysql table through php script,
my table having the details of uploading time, file name, & uploader name.

i need to find the recent uploaded file for all uploaders.

i tried with this query,

select file_name,uploded_by,MAX(date_time) from upload group by uploded_by;

it is giving the recent time, but it is not giving the latest file, it is showing first uploaded file.

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Effect Of Increased Users On Query Time - Rec Specs
I have just started my first big project and I am having trouble predicting
the system specs that will be required. At present during trials the site
has around 15 users, although this will go to 350 when it is launched.

Most of the pages execution time should not scale with the increase in users
but there are a few report pages which calculate and order the information
entered by the users.

Measuring the page on my development machine (Duron 1.2, 768MB PC133, WinXP,
running apache 1.3.22, mysql 4.0.15and php4.3.4)...

One page I am currently getting 0.2-0.3 seconds. It uses phplib templates
and it executes 9 queries at present, 1 of which I predict will scale. It
calculates the mean, standard deviation and total of around 90 measures
using results from 15 users.

I do have a few nightmare pages for the regular users which execute 150+
queries (mixture of selects and updates).

Can anyone predict what will happen with 300+ users?

I am thinking max load being 20 regular users logged in with 2 users viewing
reports.

The machine I am currently looking at is P4 2.4, 512DDR with Linux. Will
this be suitable?

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Truncated Time Values Using TIMEDIFF With ORDER BY Query
I'm using the following query:

SELECT glider, timestamp, TIMEDIFF(timestamp, UTC_TIMESTAMP()) AS last_contact
FROM surfacings
INNER JOIN
(SELECT MAX(timestamp) AS most_recent FROM surfacings GROUP BY glider)
AS tmp
WHERE surfacings.timestamp = tmp.most_recent;

to calculate the amount of time that has elapsed since the last inserted timestamp for each glider. Everything works fine: ....

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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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