Turning On Slow Query Logging?
Background: I paid a young admin set me up on a database server. He installed the basic I needed for the server...at my request...No Cpanel...mysql and apache and some tight security w/o even a domain name to SSH into. Unfortunately, he's a busy kid, and teens sometimes don't realize that people depend on them...and well, I can't really seem to get him to do much so I gave up and figured it's a good way to force me to learn all this myself...
Well anyway, now I want to turn on Slow Query logging. But before I do that, I need to know how MySQL is running. Is SQLogging turned on already? Where is it logging to? So first thing I want to look up is, when the server is rebooted, what's the command to restart mysql? No clue. How do I change the setting? And of course, the server is production, so when I make the change, it needs to be quick, it needs to be smooth, and I need to be able to roll back to the previous config if necessary.
I'm running Redhat Enterprise.
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Logging In
I'm having trouble logging into my sql server, I'm running version 4.0 just about anything I type in gives me this error message "Error SQL query: mysql MySQL said: #1064 - 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 'mysql' at line 1 " Can anyone help me with this problem?
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Logging
Is there a way to turn on some sort of logging? I am attempting to connect to a db through VB, just learned it and am not sure if I am getting in and not retrieving data or not even getting in yet. Can this be done through the console and then left on?
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Logging Problem
I have a problem with mysql general log, regarding query logging. I'm running Win2K, mysql 4.1.10 with JBoss 4.0.2. When I turn on logging, the statements executed from JBoss and logged by mysql look like this: SELECT uuid from tablex AS a WHERE a.id = ?; MySQL never logs the parameters of the statements. Can somebody tell me how to turn this on or what I am missing here?
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Using A Database For Logging
I need to log the number of "brochure Requests" on a per Region, Per date basis. eg for say 20 Regions , have a 366 columns (one per day of the year). Obviously I can write a script to Create all the tables, but it seems kind of clumsy. Do arrays exist in Mysql? It might also be easier to organise it into 52 weeks of 7 days. How do I design the tables?
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Logging Into Server
I have a linux box with MySQL. The following fails. If I try to login locally using mysql -u USERNAME -p If I go to another computer on the network and try using the same user name and password by: mysql -h SERVER ADDRESS -u USERNAME -p This login is successful.Does anyone know why the first operation fails?
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Logging On And Off MySQL
How does MySQL manage connections/sessions that are not formally and properly closed? What are the possible negative consequences if many of the software/operators on the client side fail to properly close the sessions they open? Will the MySQL server be able to handle this gracefully? Or will they consume server resources until the system crashes? Will the open sessions eventually time out close automatically? Is there a timeout value that can be set on the server? Can one query the server for information about open connections?
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Transaction Logging
I am reading up on transaction logging, and am wondering whether MySQL's binary log is its "UNDO/REDO log"? I'm a beginner to all this, and not sure whether that's the correct interpretation of the MySQL binary log. How does MySQL's transaction logging, or any transaction logging mechanism, work? I was reading up on general transaction logging principles but it was getting far too specific to SQL Server and other DBMSs, so I figured that I could come here and someone here might point me to some MySQL-specific resources on this, or perhaps help to explain how this all works. e.g. Does the transaction log get rid of all transactions once committed, what's the difference in how UNDO and REDO logs work, are these logs stored in a more complex manner than just logging the plain text statement (I'd imagine so, because otherwise how would an undo operation work)? In fact, I find it funny that I'm asking all the questions above because I'm still not quite clear on what the purpose of transaction logs is in the first place! While it would be great if somebody could help clear up the confusion I'm having, it would also be good if you could point me to some MySQL-specific resources on this topic. I browsed through the MySQL documentation and did a web search, but either did not find any resources period, or did not find resources that "dumbed it down" enough for me.
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Replication Logging
Im wondering if there is some method to automatically "clean up" the binary logs left by replication even after they are used. For example, I have a number of mysql replication logs sitting on a server. There are about 25 of them, a GIG in size each. My MYSQL replication is UP TO DATE. This means everything is properly sync'd. But I dont want to just 'DELETE' everything.
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