Common questions

Do InnoDB tables need to be optimized?

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Do InnoDB tables need to be optimized?

Doing optimize table on an InnoDB table is usually not necessary to do frequently, but only after you do a lot of insert/update/delete against the table in a way that could result in fragmentation.

How long does MySQL optimize table take?

Optimizing table straight away takes over 3 hours, while dropping indexes besides primary key, optimizing table and adding them back takes about 10 minutes, which is close than 20x speed difference and more compact index in the end.

How do I optimize a table in MySQL?

How to Optimize MySQL Tables and Defragment to Recover Space

  1. Identify Tables for Optimization. The first step is to identify whether you have fragmentation on your MySQL database.
  2. Defrag using OPTIMIZE TABLE command.
  3. Defrag using mysqlcheck command.
  4. Defrag All Tables or All Databases.
  5. After Optimization.

How can I make InnoDB faster?

InnoDB insertion faster

  1. disable log_bin.
  2. enable skip-innodb-doublewrite.
  3. set transaction_isolation to READ-COMMITTED or READ-UNCOMMITTED (actually READ-COMMITED )
  4. set innodb_flush_log_at_trx_commit to 0 or 2 (actually 0 )
  5. set innodb_buffer_pool_size to 5GB (system has 6GB RAM)

When should you run optimize tables?

Use OPTIMIZE TABLE in these cases, depending on the type of table:

  1. After doing substantial insert, update, or delete operations on an InnoDB table that has its own .
  2. After doing substantial insert, update, or delete operations on columns that are part of a FULLTEXT index in an InnoDB table.

How often should I run optimize table MySQL?

This often includes routine maintenance, such as “you should run OPTIMIZE TABLE on all of your InnoDB tables once a week to defragment them for better performance.”

When should I use optimize in MySQL?

You can use OPTIMIZE TABLE to reclaim the unused space and to defragment the data file. After extensive changes to a table, this statement may also improve performance of statements that use the table, sometimes significantly.

What is the InnoDB in MySQL?

InnoDB is a storage engine for the database management system MySQL and MariaDB. Since the release of MySQL 5.5. 5 in 2010, it replaced MyISAM as MySQL’s default table type. It provides the standard ACID-compliant transaction features, along with foreign key support (Declarative Referential Integrity).

How do I tune a MySQL database?

MySQL Performance Tuning and Optimization Tips

  1. Balance the Four Main Hardware Resources.
  2. Use InnoDB, Not MyISAM.
  3. Use the Latest Version of MySQL.
  4. Consider Using an Automatic Performance Improvement Tool.
  5. Optimize Queries.
  6. Use Indexes Where Appropriate.
  7. Functions in Predicates.
  8. Avoid % Wildcard in a Predicate.

Is MySQL optimize safe?

I’ve never had a problem with it. I’d say it’s about as safe as anything else in MySQL. I’d definitely schedule this for a quiet/off-peak time, and do a database dump beforehand and immediately after, and compare if possible.

Does optimize table replicate?

By default, OPTIMIZE TABLE statements are written to the binary log and will be replicated. You can use OPTIMIZE TABLE to reclaim the unused space and to defragment the data file.

What does OPTIMIZE TABLE do in InnoDB?

For InnoDB tables, OPTIMIZE TABLE is mapped to ALTER TABLE, which rebuilds the table to update index statistics and free unused space in the clustered index. Beginning with MySQL 5.1.27, this is displayed in the output of OPTIMIZE TABLE when you run it on an InnoDB table, as shown here:

How can I speed up InnoDB maintenance operations?

If you run maintenance operations on InnoDB tables that contain FULLTEXT indexes, consider turning the innodb_optimize_fulltext_only variable to ON – after this variable is enabled, the OPTIMIZE TABLE query should run faster because it will skip the reorganization of data in the table.

How do I use OPTIMIZE TABLE in MySQL?

For InnoDB tables, OPTIMIZE TABLE is mapped to ALTER TABLE, which rebuilds the table to update index statistics and free unused space in the clustered index. You can make OPTIMIZE TABLE work on other storage engines by starting mysqld with the –skip-new or –safe-mode option. In this case, OPTIMIZE TABLE is just mapped to ALTER TABLE.

How to disable InnoDB in MySQL server?

After that, restart your MySQL server – InnoDB should now be disabled. Alternatively, you can make use of the –innodb option: setting it to OFF disables the engine. Though do note that these options are deprecated as of MySQL 5.7.5.

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