The Ultimate Guide to High Availability with MariaDB
This is a read-only copy of the MariaDB Knowledgebase generated on 2024-11-15. For the latest, interactive version please visit https://mariadb.com/kb/.

MariaDB sorting issue

Hi,

I have one table with 4 million rows and other table with 1 million rows. When I perform join on both the table and perform the sort on the column which is not main table it is behaving really slow.

I have tested with 8 GB RAM. Whole database fits in memory.

I have also checked with EXPLAIN it is not creating temporary table on disk. How can I get best performance?

e.g query.

SELECT DISTINCT u0_.id AS id_0, a1_.created_at AS created_at_1 FROM user u0_ LEFT JOIN advertise a1_ ON (a1_.user_id = u0_.id) ORDER BY a1_.created_at DESC LIMIT 10;

Also note that all the indexes are properly created so that is not he issue here.

Answer Answered by Ian Gilfillan in this comment.

Try posting the question on #maria on IRC - you can probably get a quicker response there, and can respond to questions for more information immediately.

Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.