How to optimize this SQL query?
In case you have your own slow SQL query, you can optimize it automatically here.
For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:
- Description of the steps you can take to speed up the query.
- The optimal indexes for this query, which you can copy and create in your database.
- An automatically re-written query you can copy and execute in your database.
The optimization process and recommendations:
- Avoid Subqueries (query line: 9): We advise against using subqueries as they are not optimized well by the optimizer. Therefore, it's recommended to join a newly created temporary table that holds the data, which also includes the relevant search index.
- 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.
- Use Numeric Column Types For Numeric Values (query line: 6): Referencing a numeric value (e.g. 0400) 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:
CREATE INDEX rwol_query_idx_query_type_user_name ON RWOL_COUNTER_QUERY_TYPE (QUERY_TYPE,USER_NAME);
CREATE INDEX tma_notices_idx_tnot_type_tnot_status ON tma_notices (TNOT_NOTICE_TYPE,TNOT_NOTICE_STATUS);
The optimized query:
SELECT
count(*)
FROM
tma_notices
WHERE
tma_notices.TNOT_NOTICE_TYPE = '0400'
AND tma_notices.TNOT_NOTICE_STATUS = 'OK'
AND tma_notices.tnot_notice_id >= (
SELECT
RWOL_COUNTER_QUERY_TYPE.NOTICE_NUM_AT_MIDNIGHT
FROM
RWOL_COUNTER_QUERY_TYPE
WHERE
RWOL_COUNTER_QUERY_TYPE.QUERY_TYPE = 'START_NOTICES_TODAY'
AND RWOL_COUNTER_QUERY_TYPE.USER_NAME = 'PUBLIC'
)