This is a read-only copy of the MariaDB Knowledgebase generated on 2024-11-16. For the latest, interactive version please visit https://mariadb.com/kb/.

mariaDB Limit Issue

We I run the below query on mariaDB 5.6 With the "LIMIT 100000" query get results in approximately 0.14s and when we remove the limit results will be around 1 minute but when we run the same query with or without limit on mysql 5.6 results will be in 0.12s, Kindly provide better way around why miaraDB engine has such a issue or may be our query has something to change.

EXPLAIN SELECT DISTINCT
    am.*
FROM
    asset_make am,
    (
        SELECT DISTINCT
            amg.asset_make_id
        FROM
            asset_model_groups amg,
            (
                SELECT
                    amgf.make_model_group_id
                FROM
                    asset_model_groups_fp amgf,
                    (
                        SELECT
                            fp.financial_product_id_pk
                        FROM
                            financial_product fp,
                            (
                                SELECT
                                    fpb.financial_product_id
                                FROM
                                    financial_product_bps fpb,
                                    (
                                        SELECT
                                            usr.relative_user_id
                                        FROM
                                            user_relationships usr,
                                            (
                                                SELECT
                                                    ud.user_bp_id
                                                FROM
                                                    user_definition ud
                                                WHERE
                                                    ud.user_id = 'd75502'
                                            ) AS ud
                                        WHERE
                                            usr. CODE = '00112'
                                        AND usr.userDefinition_user_id = ud.user_bp_id
                                    ) AS usr
                                WHERE
                                    fpb.business_partner_id = usr.relative_user_id
                                AND fpb.role_id = '00001'
                            ) AS fpb
                        WHERE
                            fp.financial_product_id_pk = fpb.financial_product_id
                        AND DATE(
                            FROM_UNIXTIME(fp.valid_to_date / 1000)
                        ) >= DATE(NOW())
                        
                        LIMIT 100000
                    ) AS fp
                    
                    
                WHERE
                    amgf.financial_product_id = fp.financial_product_id_pk
            ) AS amgf
        WHERE
            amg.make_model_group_id = amgf.make_model_group_id
    ) AS amg
WHERE
    am.make_id_pk = amg.asset_make_id

Answer Answered by Ian Gilfillan in this comment.

There have been a number of optimizer improvements in the later stable releases, MariaDB 10.0, MariaDB 10.1, MariaDB 10.2 and MariaDB 10.3 - if MySQL 5.6 runs your query faster than 5.5, it's very likely the same improvements were made in a version of MariaDB > 5.5, so you can try upgrading your MariaDB version and see if that helps.

If not, and the same query runs slower on MariaDB, you can report as a bug with more details to help recreate the problem.

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.