EverSQL Database Performance Knowledge Base

The optimization process and recommendations:

1. Create Optimal Indexes (modified query below): The recommended indexes are an integral part of this optimization effort and should be created before testing the execution duration of the optimized query.
2. Use Numeric Column Types For Numeric Values (query line: 33): Referencing a numeric value (e.g. 200004) as a string in a WHERE clause might result in poor performance. Possible impacts of storing numbers as varchars: more space will be used, you won't be able to perform arithmetic operations, the data won't be self-validated, aggregation functions like SUM won't work, the output may sort incorrectly and more. If the column is numeric, remove the quotes from the constant value, to make sure a numeric comparison is done.
3. Use Numeric Column Types For Numeric Values (query line: 12): Referencing a numeric value (e.g. 200004) as a string in a WHERE clause might result in poor performance. Possible impacts of storing numbers as varchars: more space will be used, you won't be able to perform arithmetic operations, the data won't be self-validated, aggregation functions like SUM won't work, the output may sort incorrectly and more. If the column is numeric, remove the quotes from the constant value, to make sure a numeric comparison is done.
4. Use Numeric Column Types For Numeric Values (query line: 27): Referencing a numeric value (e.g. 200004) as a string in a WHERE clause might result in poor performance. Possible impacts of storing numbers as varchars: more space will be used, you won't be able to perform arithmetic operations, the data won't be self-validated, aggregation functions like SUM won't work, the output may sort incorrectly and more. If the column is numeric, remove the quotes from the constant value, to make sure a numeric comparison is done.

Optimal indexes for this query:

ALTER TABLE `ORGANIZATION` ADD INDEX `organization_idx_externalkey_id` (`EXTERNALKEY`,`ID`);
ALTER TABLE `ORGANIZATION` ADD INDEX `organization_idx_name` (`NAME`);
ALTER TABLE `PROPERTY` ADD INDEX `property_idx_idx_id` (`IDX`,`ID`);

The optimized query:

SELECT
        ORG.DESCRIPTION,
        ORG.EXTERNALKEY,
        (SELECT
            P.VALUE 
        FROM
            PROPERTY P,
            ORGANIZATION ORG 
        WHERE
            P.IDX = 24 
            AND ORG.ID = P.ID 
            AND ORG.EXTERNALKEY = '200004') AS COR_ACCOUNT,
        (SELECT
            ORG.DESCRIPTION 
        FROM
            ORGANIZATION ORG 
        WHERE
            ORG.NAME = P.VALUE) AS CPC,
        (SELECT
            P.VALUE 
        FROM
            PROPERTY P,
            ORGANIZATION ORG 
        WHERE
            P.IDX = 4 
            AND P.ID = ORG.ID 
            AND ORG.EXTERNALKEY = '200004') AS VOEN 
    FROM
        PROPERTY P,
        ORGANIZATION ORG 
    WHERE
        P.IDX = 22 
        AND ORG.EXTERNALKEY = '200004' 
        AND P.ID = ORG.ID