I am facing some issue in query execution here is my case :
I have two tables log with 2 lakh records and logrecords with 6 lakh records
Where single log record in log table can have multiple log messages in logrecords table my database schema is as below
log Table
CREATE TABLE `log` (
`logid` varchar(50) NOT NULL DEFAULT '',
`creationtime` bigint(20) DEFAULT NULL,
`serviceInitiatorID` varchar(50) DEFAULT NULL,
PRIMARY KEY (`logid`),
KEY `idx_creationtime_wsc_log` (`creationtime`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
And logrecords Table
CREATE TABLE `logrecords` (
`logrecordid` varchar(50) NOT NULL DEFAULT '',
`timestamp` bigint(20) DEFAULT NULL,
`message` varchar(8000) DEFAULT NULL,
`loglevel` int(11) DEFAULT NULL,
`logid` varchar(50) DEFAULT NULL,
`indexcolumn` int(11) DEFAULT NULL,
PRIMARY KEY (`logrecordid`),
KEY `indx_logrecordid_message_logid` (`logrecordid`,`message`(767),`logid`),
KEY `logid` (`logid`),
KEY `indx_message` (`message`(767))
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Query created by hibernate is like
select this_.logid as logid4_1_, this_.loglevel as loglevel4_1_, this_.creationtime as creation3_4_1_,this_.serviceInitiatorID as service17_4_1_, this_.logtype as logtype4_1_,logrecord1_.logrecordid as logrecor1_3_0_, logrecord1_.timestamp as timestamp3_0_, logrecord1_.message as message3_0_, logrecord1_.loglevel as loglevel3_0_, logrecord1_.logid as logid3_0_, logrecord1_.indexcolumn as indexcol6_3_0_ from log this_ inner join wsc_logrecords logrecord1_ on this_.logid=logrecord1_.logid where (1=1) and (1=1) and logrecord1_.message like 'SecondMessage' order by this_.creationtime desc limit 25
Which taking around 7313ms to execute
Query Explain is like
But when I execute below query it is taking around 15 min to execute
select count(*) as y0_ from log this_ inner join logrecords logrecord1_ on this_.logid=logrecord1_.logid where (1=1) and (1=1) and lower(logrecord1_.message) like 'SecondMessage' order by this_.creationtime desc limit 25
For above query explain is like
and I am using MySQl database. I think there is some issue in indexing or some other which I am not able to identify
Any solution will be appreciated.