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Replace broken SQL tuning links #163

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Jun 29, 2018
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Replace broken SQL tuning links #163

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fff221c
Replaced broken link in SQL Tuning chapter and replaced outdated one
nick-kanakis Jun 22, 2018
69b0670
Replaces broken link for 'Tips for optimizing MySQL queries'
nick-kanakis Jun 22, 2018
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4 changes: 2 additions & 2 deletions README.md
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Expand Up @@ -930,11 +930,11 @@ Benchmarking and profiling might point you to the following optimizations.

##### Tune the query cache

* In some cases, the [query cache](http://dev.mysql.com/doc/refman/5.7/en/query-cache) could lead to [performance issues](https://www.percona.com/blog/2014/01/28/10-mysql-performance-tuning-settings-after-installation/).
* In some cases, the [query cache](https://dev.mysql.com/doc/refman/5.7/en/query-cache.html) could lead to [performance issues](https://www.percona.com/blog/2016/10/12/mysql-5-7-performance-tuning-immediately-after-installation/).

##### Source(s) and further reading: SQL tuning

* [Tips for optimizing MySQL queries](http://20bits.com/article/10-tips-for-optimizing-mysql-queries-that-dont-suck)
* [Tips for optimizing MySQL queries](http://aiddroid.com/10-tips-optimizing-mysql-queries-dont-suck/)
* [Is there a good reason i see VARCHAR(255) used so often?](http://stackoverflow.com/questions/1217466/is-there-a-good-reason-i-see-varchar255-used-so-often-as-opposed-to-another-l)
* [How do null values affect performance?](http://stackoverflow.com/questions/1017239/how-do-null-values-affect-performance-in-a-database-search)
* [Slow query log](http://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html)
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