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Replaced broken link in SQL Tuning chapter and replaced outdated one

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nicolasmanic
2018-06-22 18:07:42 +03:00
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@@ -930,7 +930,7 @@ 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