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to fix than pure PHP problems because you can narrow down the position of the error very easily, then analyse the faulty SQL line to spot the problem. There http://www.hackingwithphp.com/19/8/6/handling-mysql-errors are several ways to debug your SQL usage: Firstly, always check your code is actually correct - use the MySQL monitor to try your queries out to make sure they do what you think http://serverfault.com/questions/103767/php-mysql-how-to-debug-a-too-many-connections-error they should do, as it will show you your results in an easy-to-read manner and will also give you meaningful error messages if you have slipped up along the way. Secondly, remember that mysql error mysqli_query() will return false if the query failed to execute, which means you can test its return value to see whether your SQL statement is faulty. You should be wary of trying to wrap mysqli_query() up inside another function call, because if it returns false due to a bad query, the chances are the parent function will error out. Consider the following code: extract(mysqli_fetch_assoc(mysqli_query($db, "SELECT Blah FROM Blah php debug mysql WHERE Blah = $Blah;"))); Yes, it is perfectly valid SQL and under ideal conditions should work, but what if $Blah is unset? Another possibility is that $Blah might end up being a string - note that there are no quotes around $Blah, which means that if $Blah is a string, MySQL will consider it to be a field name, and the query will likely fail. If the query does fail for some reason, mysqli_fetch_assoc() will fail and output errors, then extract() will fail and output errors, causing a splurge of error messages that likely hinder more than help. Much better is this code: $result = mysqli_query($db, "SELECT Blah FROM Blah WHERE Blah = $Blah;"); if ($result) { extract(mysqli_fetch_assoc($result)); } That is not to say that having all three functions on one line is incorrect - indeed, I use it all the time. However, you should be very sure of any SQL statement you use in that manner, because any mistakes will be very visible to your users. A helpful function for debugging MySQL queries is mysqli_error(), which returns any MySQL errors from the last function call. Each time you call a new MySQL function, the value mysqli_error() is wiped, wh
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top PHP/mySQL: how to debug a 'too many connections' error? up vote 8 down vote favorite 1 I am working right now with PHP website on my client's dedicated server and I get periodically an error too many connections but ~5 users are browsing this page. In phpMyAdmin I can see that max connections variable is set to 400. On our local MySQL server in my corporation we have max connections set to 200 and other mates uses in the same time this server. I heard that on their server some other web is using the same MySQL with big trafiic. Here are my questions: How to debug this problem? Can I look into some list of SQL queries that was executed in last 10 minutes to check if it is our problem or their? mysql connection share|improve this question edited Jan 18 '10 at 14:32 splattne 23.8k1686138 asked Jan 18 '10 at 13:51 hsz 1795 add a comment| 1 Answer 1 active oldest votes up vote 2 down vote accepted The symptoms you describe point to persistent connections. In some setups PHP does not handle persistent connections very well: it tends to open new connections rather than reuse the existing ones. I suggest you disable this feature and see if the issue persists: At code level: find calls to mysql_pconnect() and replace them with mysql_connect(). At configuration level: find the mysql.allow_persistent directive and set it to false. If you notice an improvement, you can try to fine tune persistent calls or get rid of them permanently. share|improve this answer answered Jan 18 '10 at 15:14 Álvaro González 1423519 I also shoot that case. At all I can not modify their web/server configuration to make that changes (my web does n