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I have this huge 32 GB SQL dump that I need to import into MySQL. I haven't had to import such a huge SQL dump before. I did the usual:

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It is taking too long. There is a table with around 300 million rows, it's gotten to 1.5 million in around 3 hours. So, it seems that the whole thing would take 600 hours (that's 24 days) and is impractical. So my question is, is there a faster way to do this?

1. The tables are all InnoDB and there are no foreign keys defined. There are, however, many indexes.
2. I do not have access to the original server and DB so I cannot make a new back up or do a 'hot' copy etc.
3. Setting innodb_flush_log_at_trx_commit = 2 as suggested here seems to make no (clearly visible/exponential) improvement.
4. Server stats during the import (from MySQL Workbench): https://imgflip.com/gif/ed0c8.
5. MySQL version is 5.6.20 community.
6. innodb_buffer_pool_size = 16M and innodb_log_buffer_size = 8M. Do I need to increase these?

RolandoMySQLDBA

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Importer Mysql 2 Crackheads 1

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4 Answers

Percona's Vadim Tkachenko made this fine Pictorial Representation of InnoDB

You definitely need to change the following

Why these settings ?

• innodb_buffer_pool_size will cache frequently read data
• innodb_log_buffer_size : Larger buffer reduces write I/O to Transaction Logs
• innodb_log_file_size : Larger log file reduces checkpointing and write I/O
• innodb_write_io_threads : Service Write Operations to .ibd files. According to MySQL Documentation on Configuring the Number of Background InnoDB I/O Threads, each thread can handle up to 256 pending I/O requests. Default for MySQL is 4, 8 for Percona Server. Max is 64.
• innodb_flush_log_at_trx_commit
  • In the event of a crash, both 0 and 2 can lose once second of data.
  • The tradeoff is that both 0 and 2 increase write performance.
  • I choose 0 over 2 because 0 flushes the InnoDB Log Buffer to the Transaction Logs (ib_logfile0, ib_logfile1) once per second, with or without a commit. Setting 2 flushes the InnoDB Log Buffer only on commit. There are other advantages to setting 0 mentioned by @jynus, a former Percona instructor.

Appraiser austin employee haynes software testing. Restart mysql like this

This disables the InnoDB Double Write Buffer

Import your data. When done, restart mysql normally

This reenables the InnoDB Double Write Buffer

Give it a Try !!!

SIDE NOTE : You should upgrade to 5.6.21 for latest security patches.

RolandoMySQLDBARolandoMySQLDBA

Do you really need the entire database to be restored? If you don't, my 2c:

You can extract specific tables to do your restore on 'chunks'. Something like this:

I did it once and it took like 10 minutes to extract the table I needed - my full restore took 13~14 hours, with a 35GB (gziped) dump.

The /pattern/,/pattern/p with the -n parameter makes a slice 'between the patterns' - including them.

Anyways, to restore the 35GB I used an AWS EC2 machine (c3.8xlarge), installed Percona via yum (Centos) and just added/changed the following lines on my.cnf:

I think the numbers are way too high, but worked for my setup.

Paul White♦

The fastest way to import your database is to copy the ( .frm, .MYD, .MYI ) files if MyISAM, directly to the /var/lib/mysql/'database name'.

Importer Mysql 2 Crackheads Free

Otherwise you can try : mysql > use database_name; . /path/to/file.sql

Thats another way to import your data.

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one way to help speed the import is to lock the table while importing. use the --add-locks option to mysqldump.

or you could turn on some useful parameters with --opt this turns on a bunch of useful things for the dump.

If you have another storage device on the server then use that - copying from one device to another is a way to speed up transfers.

you can also filter out tables that are not required with --ignore-table

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