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    <p><a href="https://dev.mysql.com/doc/refman/5.5/en/commit.html" rel="nofollow">How to do Transactions in MySQL.</a> </p> <p>In your case you might be interessted in the atomicity and isolation of transactions, meaning that when restarting a game, you want to ensure that before the reset has not fully finished, nobody can fetch any of your intermediate data. Doing the reset inside a transaction will ensure this property*. (* for TRUNCATE see below) </p> <p>You will need InnoDB as your Engine for all tables that are involved in your transactions. MyISAM does not support transactions. </p> <p>Changing large amounts of data inside a transaction can potentially cause high query delays, as transaction use special undo/redo-logs to be able to undo all the things you did in your transaction, if you decide to <code>ROLLBACK</code>. </p> <p>I wouldn't wipe the tables when starting a new game. Instead give your data a <code>game_id</code> and use a new <code>game_id</code> when starting a new game. Space shouldn't really be an issue nowadays. This has the advantage that you will need little to none table <a href="https://dev.mysql.com/doc/refman/5.0/en/lock-tables.html" rel="nofollow">locking</a> when reseting the game. </p> <p>If you must, be sure to use <code>TRUNCATE</code> when clearing out the tables. As far as I know <code>TRUNCATE</code> in MySQL cannot be rolled back, so doing it inside a transaction won't do anything useful. </p> <p>I think PHP/MySQL will perform fine if used correctly, even for larger visitor counts. You can use profiling tools like <a href="http://xdebug.org/" rel="nofollow">xdebug</a> or the <a href="https://dev.mysql.com/doc/refman/5.0/en/slow-query-log.html" rel="nofollow">MySQL slow query log</a> to trace and remove performance bottle necks. </p>
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    1. POHow do I make sure the rapidly changing data from my MySQL DB is accurately represented in php scripts?
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    1. USBasti
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    1. POHow do I make sure the rapidly changing data from my MySQL DB is accurately represented in php scripts?
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    1. COTo be clear, the List Objects and Add Objects will be accessed much more frequently than the 'Reset' one. Is there a way to, when reset is called, make currently running scripts restart or fail? (This was exactly the type of answer I was looking for, thanks so much. )
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    2. COYes you can lock the tables you want to prevent from beeing accessed while reseting. See [MySQL's manual on locking](https://dev.mysql.com/doc/refman/5.6/en/lock-tables.html).
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    3. COThe thing you are talking about in your first edit is called a "shadow table". Found [this link](http://arnab.org/node/1169) for mysql. Seeing your code you should also thoroughly read [about SQL injection](https://en.wikipedia.org/wiki/SQL_injection#Incorrect_type_handling). :-)
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