Why does INSERT statement take too long in MySQL?
When you set innodb_flush_log_trx_at_commit=0, InnoDB will write the modified data (in InnoDB Buffer Pool) to log file (ib_logfile) and flush the log file (write to disk) every second, but it will not do anything at transaction commit. So, your insertion will be fast.
Why does SQL Server insert into large table take so long?
Recently I have experimented with changing the clustered index of the large table to an identity int column, which has brought the insert down from 3 hours to one hour, but I am still puzzled why this simple query should take so long to run (regardless of the size of the table) CREATE TABLE [dbo].
Why does INSERT statement take too long in InnoDB?
Especially touching the same table. InnoDB supports transaction If you have multiple insertion then use transaction in your insertion. As, innoDB has to do a commit after each insertion statement which slowed down the insertion process. If using Transaction does not solve your problem then check innodb_fush_log_at_trx_commit.
How to improve the performance of SQL inserts?
The first Tip I would give you, is to disable the autocommit functionality and than commit manually. LOCK TABLES a WRITE; DO INSERTS HERE UNLOCK TABLES; This benefits performance because the index buffer is flushed to disk only once, after all INSERT statements have completed.
Why does SQL query occasionally take so long to complete?
CPUs are about 50% idle. iostat -x 5 (reports less than 10% utilization for harddisks) top report load average about 10 for 1 minute (normal for our db machine) I’m at a loss to find out what is causing this performance lag.
How to optimize MySQL for faster inserts?
Some optimizations don’t need any special tools, because the time difference will be significant. For example, when we switched between using single inserts to multiple inserts during data import, it took one task a few hours, and the other task didn’t complete within 24 hours.
Why does insert to table slow down MySQL?
Inserting to a table that has an index will degrade performance because MySQL has to calculate the index on every insert. In case there are multiple indexes, they will impact insert performance even more. Check every index if it’s needed, and try to use as few as possible.