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Sarah's thoughts on MySQL

Sarah's thoughts on MySQL. Saturday, September 5, 2009. MySQL's query cache is somewhat unique and can be very beneficial to certain applications, such as web apps that run the same queries over and over. If you're unfamiliar with the query cache, here are some key points:. The query cache holds SELECT statements and. Their result sets. By "SELECT statements" I mean the entire query is considered 1 entry in the cache. Subselects or queries that are part of a UNION are not cached individually. The cache w...

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Sarah's thoughts on MySQL | sarahdba.blogspot.com Reviews

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Sarah's thoughts on MySQL. Saturday, September 5, 2009. MySQL's query cache is somewhat unique and can be very beneficial to certain applications, such as web apps that run the same queries over and over. If you're unfamiliar with the query cache, here are some key points:. The query cache holds SELECT statements and. Their result sets. By SELECT statements I mean the entire query is considered 1 entry in the cache. Subselects or queries that are part of a UNION are not cached individually. The cache w...

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Sarah's thoughts on MySQL | sarahdba.blogspot.com Reviews

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Sarah's thoughts on MySQL. Saturday, September 5, 2009. MySQL's query cache is somewhat unique and can be very beneficial to certain applications, such as web apps that run the same queries over and over. If you're unfamiliar with the query cache, here are some key points:. The query cache holds SELECT statements and. Their result sets. By "SELECT statements" I mean the entire query is considered 1 entry in the cache. Subselects or queries that are part of a UNION are not cached individually. The cache w...

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Sarah's thoughts on MySQL: Common indexing mistakes

http://sarahdba.blogspot.com/2009/08/common-indexing-mistakes.html

Sarah's thoughts on MySQL. Friday, August 14, 2009. Here's a quick list of common mistakes that I've seen regarding indexing in MySQL. 1 Not using an index. Enable your slow query log (and consider setting long query time and log queries not using indexes too) and watch for queries that aren't using an index. 2 Using CREATE INDEX. 3 Misusing a composite index. CREATE TABLE customer (. Custid INT UNSIGNED AUTO INCREMENT PRIMARY KEY,. INDEX (lname, fname). SELECT * FROM customer WHERE fname = 'Sarah'.

2

Sarah's thoughts on MySQL: Redundant management nodes in MySQL Cluster

http://sarahdba.blogspot.com/2009/08/redundant-management-nodes-in-mysql.html

Sarah's thoughts on MySQL. Thursday, August 27, 2009. Redundant management nodes in MySQL Cluster. Every time I teach the MySQL Cluster architecture, someone inevitably asks "Isn't the management node (ndb mgmd) a single point of failure? The short answer: no. The management node is not a SPOF because the cluster can continue without it. However, it's inconvenient if your management node is down because the management node does several things such as:. Arbitration in case of a potential split-brain.

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Sarah's thoughts on MySQL: Common mistake: looking for "random" rows

http://sarahdba.blogspot.com/2009/08/common-mistake-looking-for-random-rows.html

Sarah's thoughts on MySQL. Sunday, August 2, 2009. Common mistake: looking for "random" rows. There are many wrong ways to find a "random" row. For example:. SELECT . ORDER BY rand() LIMIT 1;. There are better ways to find a "random" row. Maybe in a future blog post I'll go into them, but at the very least consider calculating a random number ahead of time and looking up a row with that id. August 17, 2009 at 9:17 AM. Jan wrote a good post on it quite a while ago:. Subscribe to: Post Comments (Atom).

4

Sarah's thoughts on MySQL: September 2009

http://sarahdba.blogspot.com/2009_09_01_archive.html

Sarah's thoughts on MySQL. Saturday, September 5, 2009. MySQL's query cache is somewhat unique and can be very beneficial to certain applications, such as web apps that run the same queries over and over. If you're unfamiliar with the query cache, here are some key points:. The query cache holds SELECT statements and. Their result sets. By "SELECT statements" I mean the entire query is considered 1 entry in the cache. Subselects or queries that are part of a UNION are not cached individually. The cache w...

5

Sarah's thoughts on MySQL: Best MySQL backup strategy

http://sarahdba.blogspot.com/2009/08/best-mysql-backup-strategy.html

Sarah's thoughts on MySQL. Sunday, August 16, 2009. Best MySQL backup strategy. There are several ways to take backups (some good, some bad, and some will depend on your situation). Here's the thought process I use for choosing a backup strategy. If your data set is small (I realize "small" is a relative term. to qualify it, let's say. Backup everything or just certain databases or tables. Backup only the DDL. Optimize the dump for a faster restore. And many more things. So let's say you have more than 1...

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Sarah's thoughts on MySQL

Sarah's thoughts on MySQL. Saturday, September 5, 2009. MySQL's query cache is somewhat unique and can be very beneficial to certain applications, such as web apps that run the same queries over and over. If you're unfamiliar with the query cache, here are some key points:. The query cache holds SELECT statements and. Their result sets. By "SELECT statements" I mean the entire query is considered 1 entry in the cache. Subselects or queries that are part of a UNION are not cached individually. The cache w...

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