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Why is Mysqldump so slow?
Make sure you’re saving to storage local to the instance you’re running mysqldump on. Don’t save to remote storage. Also be careful if the storage volume to which you’re writing the dump has other heavy I/O traffic saturating it, this could slow down writes.
What is Mysqldumpslow?
mysqldumpslow is a tool to examine the slow query log. It parses the slow query log files, printing a summary result. Normally, mysqldumpslow groups queries that are similar except for the particular values of number and string data values. It “abstracts” these values to N and ´S´ when displaying summary output.
How do I drop a large SQL database?
So you will want to do a two step process instead: First, create a backup with ONLY the table information, no data. Then create a backup, including only data from the tables you need. [path_to_mysql/]mysqldump -u [USERNAME] -p [DBNAME] –no-create-info –ignore-table=[DBNAME]. search_index –ignore-table=[DBNAME].
Why does MySQL slow down when importing files?
Most of the slowdown is I/O based, but you can still get a 40% improvement by dumping into tables and then importing them say 4 at a time. having the files gzipped before pushing them to mysql doesn’t slow anything down mostly because of the lowered I/O.
Which is faster to dump from MySQL or InnoDB?
Dump with –tab format so you can use mysqlimport, which is faster than mysql < dumpfile. Import with multiple threads, one for each table. Use a different database engine if possible. importing into a heavily transactional engine like innodb is awfully slow. Inserting into a non-transactional engine like MyISAM is much much faster.
Why is.sql dump file so slow?
So depending on the tool generating the database dump (or more specifically the format of the INSERT statements), the speed can be influenced. Note: This also decreases the .sql dump file by over 60% in my tests, so it will save on i/o as well.
How to improve the loading speed of MySQL?
Use a different database engine if possible. importing into a heavily transactional engine like innodb is awfully slow. Inserting into a non-transactional engine like MyISAM is much much faster. Turn off foreign key checks and turn on auto-commit.