Question : MySQL Temp table SLOW!

So I have this proc that is DEAD SLOW. It takes minutes to return. If I dont use a temp table, it takes about a tenth of a second.

Any clues?

         
           
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          -- --------------------------------------------------------------------------------
-- Routine DDL
-- --------------------------------------------------------------------------------
DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `getCompanyOverviewV4`(
  IN iCk INT(10) ZEROFILL
)
BEGIN

    CREATE TEMPORARY TABLE IF NOT EXISTS filingIDTT (
        filingID INT
    );

    INSERT INTO filingIDTT (filingID)
    SELECT filingID
    FROM aggr_filings
    WHERE cik_issuer = iCIK;

    SELECT *
    FROM aggr_filings
    WHERE filingID IN (SELECT filingID FROM filingIDTT);

    SELECT *
    FROM aggr_transactions
    WHERE filingID IN (SELECT filingID FROM filingIDTT);

    SELECT *
    FROM ceostockwatch.aggr_owners
    WHERE filingID IN (SELECT filingID FROM filingIDTT);

    DROP TEMPORARY TABLE filingIDTT;

END

           
         

Answer : MySQL Temp table SLOW!

Hi!

Does your aggr_filingID have index on the column cik_issuer ?
If not I would create an non-unique index on the columns (cik_issuer, filingID) which
would give you index-only scan/reading for the first query.
Then I would create or have an index on the column filingID the temporary table filingIDTT
like this

CREATE TEMPORARY TABLE IF NOT EXISTS filingIDTT (
filingID INT, INDEX USING BTREE ( filingID)
);

Hope this helps.

Regards,
Tomas Helgi