… is impact of MySQL Performance by complex queries on large data sets(ie some large aggregate queries)… if you use Innodb tables and so do not suffer from table locks reporting queries can… none of them can take too much resources for too long time. If you delete things do DELETE … LIMIT 1000 and…
Post: Identifying the load with the help of pt-query-digest and Percona Server
December 29, 2011 By 3 Comments
…DELETE…taking up the longest sum of run time, query ranked #1. The first row in the table…tables involved and the query execution plan used by MySQL…table size needed per query is 270.35k, which is not much…
Post: Fighting MySQL Replication Lag
September 22, 2008 By 6 Comments
…to update/delete and having multiple queries to delete it (…query will perform full table scan in MySQL 5.0 (even…described but can be much worse as SELECT …reasons (locking, long query time, waste of execution on…which will take SELECT query and the table to …pause if it becomes too large. This is a bit…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 17 Comments
…: /* In the pessimistic delete, if the page… policy replacement algorithm takes into account page position… pool by large full table scan HT:… the same time HT: All…) Question: How much space InnoDB…MySQL Server option, though it may have problems on Linux if you lock very large… it commits too often and …
