Mysql Query taking more time to execute? - mysql

Question

SELECT BB.NAME BranchName,VI.NAME Village,COUNT(BAC.CBSACCOUNTNUMBER) "No.Of Accounts",
SUM(BAC.CURRENTBALANCE) SumOfAmount,
SUM(CASE WHEN transactiontype = 'C' THEN amount ELSE 0 END) AS CreditTotal,
SUM(CASE WHEN transactiontype = 'D' THEN amount ELSE 0 END) AS DebitTotal,
SUM(CASE WHEN transactiontype = 'C' THEN amount WHEN transactiontype = 'D' THEN -1 * amount ELSE 0 END) AS CurrentBalance
FROM CUSTOMER CU,APPLICANT AP,ADDRESS AD,VILLAGE VI,BANKBRANCH BB,BANKACCOUNT BAC
LEFT OUTER JOIN accounttransaction ACT ON ACT.BANKACCOUNT_CBSACCOUNTNUMBER=BAC.CBSACCOUNTNUMBER
AND DATE_FORMAT(ACT.TRANDATE,'%Y-%m-%d')<='2013-05-09'
AND DATE_FORMAT(BAC.ACCOUNTOPENINGDATE,'%Y-%m-%d') <'2013-05-09'
AND ACT.BANKACCOUNT_CBSACCOUNTNUMBER IS NOT NULL
WHERE CU.CODE=AP.CUSTOMER_CODE AND BAC.ENTITY='CUSTOMER' AND BAC.ENTITYCODE=CU.CODE
AND AD.ENTITY='APPLICANT' AND AD.ENTITYCODE=AP.CODE
AND AD.VILLAGE_CODE=VI.CODE AND VI.STATE_CODE=AD.STATE_CODE AND VI.DISTRICT_CODE=AD.DISTRICT_CODE
AND VI.BLOCK_CODE=AD.BLOCK_CODE AND VI.PANCHAYAT_CODE=AD.PANCHAYAT_CODE
AND CU.BANKBRANCH_CODE=BB.CODE AND BAC.CBSACCOUNTNUMBER IS NOT NULL AND ACT.TRANSACTIONTYPE IS NOT NULL
GROUP BY BB.NAME,VI.NAME LIMIT 10;
and
below is my explain plan
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE AD index ADDRESS_ENTITYCODE ADDRESS_ENTITYCODE 598 NULL 47234 Using where; Using index; Using temporary; Using filesort
1 SIMPLE VI ref PRIMARY PRIMARY 62 fiserveraupgb.AD.VILLAGE_CODE 1 Using where
1 SIMPLE AP eq_ref PRIMARY,AppCodeIndex PRIMARY 62 fiserveraupgb.AD.ENTITYCODE 1
1 SIMPLE BAC ref BANKACCOUNT_ENTITYCODE BANKACCOUNT_ENTITYCODE 63 fiserveraupgb.AP.CUSTOMER_CODE 1 Using where; Using index
1 SIMPLE CU eq_ref PRIMARY,CustCodeIndex PRIMARY 62 fiserveraupgb.AP.CUSTOMER_CODE 1
1 SIMPLE BB ref PRIMARY,Bankbranch_CodeName PRIMARY 62 fiserveraupgb.CU.BANKBRANCH_CODE 1
1 SIMPLE ACT index NULL accounttransaction_sysidindes 280 NULL 22981 Using where; Using index; Using join buffer
Mysql server version 5.5 and I am using mysql workbench below is my query it is taking 13 min to execute, please suggestion the best method I have created the indexes for all the columns which are involved.

Answer 1

You mainly need indexes on columns that are used in joins and in your where clause. Other indexes don't add value for your select statements and slow down your inserts and updates.
In this case, you're using the column values in functions. Due to this the indexes cannot be used efficiently.
An expression like this is very inefficient:
DATE_FORMAT(ACT.TRANDATE,'%Y-%m-%d')<='2013-05-09'
It causes a lot of string conversions, because all TRANDATES are converted to a string representation of their value. These values need to be temporarily stored and are not indexed, so apart from the conversion, any index on ACT.TRANDATE is no longer used. That is probably causing the rather expensive 'Using join buffer' at the end of your explain plan.
Rather convert the string '2013-05-09' to a date value and use this value as a constant in or parameter for your query.
Another thing to do, is create not separate indexes for separate columns, but one index for a group of columns that is used in a where and/or join. For instance this part:
AD.ENTITY = 'APPLICANT' AND
AD.ENTITYCODE = AP.CODE AND
AD.VILLAGE_CODE = VI.CODE
Having one index on the columns ENTITY, ENTITYCODE, and VILLAGE_CODE together would be more efficient than having a separate index for each of them. And it may help to include the other columns as well.
And last: If a column or combination of columns is guaranteed to be unique, ad a unique index. It is slightly faster in selects.
A general advise: Don't mix old join syntax with ansi joins. It makes your query hard to read.
These hints (apart from the last one) should speed up your query, but it can still be slow, depending on the amount of data, the hardware and the load.