MySQL instance stalling "doing SYNC index"
Problem An instance of MySQL 5.6.20 running (mostly just) a database with InnoDB tables is exhibiting occasional stalls for all update operations for the duration of 1-4 minutes with all INSERT, UPDATE and DELETE queries remaining in "Query end" state. This obviously is most unfortunate. The MySQL slow query log is logging even the most trivial queries with insane query times, hundreds of them wit
Optimize IN clause in where query with order by - MySQL
I am trying to optimize a query that using IN clause in WHERE to avoid file sorting. To make it easy , I created the following sample which shows the problem. Here is my query: SELECT * FROM `test` WHERE user_id = 9898 AND status IN (1,3,4) order by id limit 30; Here is the result of explain, as you can see the query is filesort id select_type table type possible_keys key key_len ref rows Extra 1
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How soon after updating expire_logs_days param and restarting sql will old binlogs get deleted?
