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Drop-in Replacement for MySQL

MariaDB versions function as a "drop-in replacement" for the equivalent MySQL version, with some limitations. What this means is that:

  • MariaDB's data files are generally binary compatible with those from the equivalent MySQL version.
    • All filenames and paths are generally the same.
    • Data and table definition files (.frm) files are binary compatible.
    • See note below for an incompatibility with views!
  • MariaDB's client protocol is binary compatible with MySQL's client protocol.
    • All client APIs and structs are identical.
    • All ports and sockets are generally the same.
    • All MySQL connectors (PHP, Perl, Python, Java, .NET, MyODBC, Ruby, MySQL C connector etc) work unchanged with MariaDB.
    • There are some installation issues with PHP5 that you should be aware of (a bug in how the old PHP5 client checks library compatibility).

This means that for many cases, you can just uninstall MySQL and install MariaDB and you are good to go. There is not generally any need to convert any data files.

However, you must still run mysql_upgrade to finish the upgrade. This is needed to ensure that your mysql privilege and event tables are updated with the new fields MariaDB uses.

We do monthly merges with the MySQL code base to ensure that MariaDB has any relevant bug fixes added to MySQL.

That said, MariaDB has a lot of new options, extension, storage engines and bug fixes that are not in MySQL. You can find the feature set for the different MariaDB versions on the What is in the different MariaDB Releases page.

Drop-in Compatibility of Specific MariaDB Versions

MariaDB 10.2, MariaDB 10.3, and MariaDB 10.4 function as limited drop-in replacements for MySQL 5.7, as far as InnoDB is concerned. However, the implementation differences continue to grow in each new MariaDB version.

MariaDB 10.0 and White Football Falcons Untouchable Stitched Women's Mcgary Kaleb Limited Jersey Vapor 76 function as limited drop-in replacements for MySQL 5.6, as far as InnoDB is concerned. However, there are some implementation differences in some features.

MariaDB 5.5 functions as a drop-in replacement for MySQL 5.5.

MariaDB 5.1, MariaDB 5.2, and MariaDB 5.3 function as drop-in replacements for MySQL 5.1.

Replication Compatibility

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Master→ MariaDB-5.5 MariaDB-10.1 MariaDB-10.2 MariaDB-10.3 MariaDB-10.4 MySQL-5.6 MySQL-5.7 MySQL-8.0
Slave ↓
MariaDB-5.5 Ok No No No No No No No
MariaDB-10.1 Ok Ok Ok
MariaDB-10.2 Ok Ok Ok Ok Ok
MariaDB-10.3 Ok Ok Ok Ok Ok Dri-fit To Salute Dodgers Angeles T-shirt Men's Service Ok
MariaDB-10.4 Ok Ok Ok Ok Ok Ok Ok
MySQL-5.6 X X X
MySQL-5.7 X X X
MySQL-8.0 Dri-fit To Salute Dodgers Angeles T-shirt Men's Service X X X

Note X: Refer to MySQL documentation

Note: When replication from MySQL in GTID mode, MariaDB will remove the MySQL GTID events and replace them with MariaDB GTID events.

Incompatibilities between Currently Supported MariaDB Versions and MySQL

Incompatibilities between MariaDB 10.3 and MySQL 5.7

See Incompatibilities and Feature Differences Between MariaDB 10.3 and MySQL 5.7 for details.

Incompatibilities between MariaDB 10.2 and MySQL 5.7

See Incompatibilities and Feature Differences Between MariaDB 10.2 and MySQL 5.7 for details.

Incompatibilities between White Football Falcons Untouchable Stitched Women's Mcgary Kaleb Limited Jersey Vapor 76 and MySQL 5.7

Incompatibilities between MariaDB 5.5 and MySQL 5.5

Incompatibilities between Currently Unsupported MariaDB Versions and MySQL

Incompatibilities between MariaDB 10.0 and MySQL 5.6

Incompatibilities between MariaDB 5.3 and MySQL 5.1

  • Views with definition ALGORITHM=MERGE or ALGORITHM=TEMPTABLE got accidentally swapped between MariaDB 5.2 and MariaDB 5.3! You have to re-create views created with either of these definitions!
  • A few error messages related to wrong conversions are different as MariaDB provides more information in the message about what went wrong.
  • Error numbers for MariaDB-specific errors have been moved to start from 1900 so as not to conflict with MySQL errors.
  • Dri-fit To Salute Dodgers Angeles T-shirt Men's Service Microseconds now work in all contexts; MySQL, in some contexts, lost the microsecond part from datetime and time.
  • UNIX_TIMESTAMP(constant-date-string) returns a timestamp with 6 decimals in MariaDB while MySQL returns it without a decimal. This can cause a problem if you are using UNIX_TIMESTAMP() as a partitioning function. You can fix this by using FLOOR(UNIX_TIMESTAMP(..)) or changing the date string to a date number, like 20080101000000.
  • MariaDB performs stricter checking of date, datetime and timestamp values. For example UNIX_TIMESTAMP('x') now returns NULL instead of 0.
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  • The old --maria- startup options are removed. You should use the --aria- prefix instead. (MariaDB 5.2 supports both --maria- and --aria-)
  • SHOW PROCESSLIST has an extra Progress column which shows progress for some commands. You can disable it by starting mysqld with either --old-mode=NO_PROGRESS_INFO or with the --old flag (see OLD_MODE).
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  • INFORMATION_SCHEMA.PROCESSLIST has three new columns for progress reporting: STAGE, MAX_STAGE, and Dri-fit To Salute Dodgers Angeles T-shirt Men's Service PROGRESS.
  • Long comments which start with /*M! or /*M!##### are executed.
  • If you use max_user_connections=0 (which means any number of connections) when starting mysqld, you can't change the global variable anymore while mysqld remains running. This is because when mysqld is started with max_user_connections=0 it does not allocate counting structures (which also involve a mutex for each connection). This would lead to wrong counters if you later changed the variable. If you want to be able to change this variable at runtime, set it to a high value at startup.
  • You can set max_user_connections (both the global variable and the GRANT option) to -1 to stop users from connecting to the server. The global max_user_connections variable does not affect users with the SUPER privilege.
  • The IGNORE directive does not ignore all errors (like fatal errors), only things that are safe to ignore.

Incompatibilities between MariaDB 5.2 and MySQL 5.1

The list is the same as between MariaDB 5.1Base Red Of Cool Stitched New 5 Albert Anaheim Angels Baseball Jersey Pujols and MySQL 5.1, with one addition:

  • A new SQL_MODE value was added: IGNORE_BAD_TABLE_OPTIONS. If it is not set, using a table, field, or index attribute (option) that is not supported by the chosen storage engine will cause an error. This change might cause warnings in the error log about incorrectly defined tables from the mysql database, fix that with mysql_upgrade.

For all practical purposes, MariaDB 5.2 is a drop in replacement for MariaDB 5.1 and MySQL 5.1.

Incompatibilities between MariaDB 5.1 and MySQL 5.1

In some few cases MariaDB has to be incompatible to allow MariaDB to provide more and better information than MySQL.

Here is the list of all known user level incompatibilities you may see when using MariaDB 5.1 instead of MySQL 5.1.

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  • The installation package names start with MariaDB instead of MySQL.
  • Timings may be different as MariaDB is in many cases faster than MySQL.
  • mysqld in MariaDB also reads the [mariadb] sections of your my.cnf files.
  • You can't use a binary only storage engine library with MariaDB if it's not compiled for exactly the same MariaDB version. (This is because the server internal structure THD is different between MySQL and MariaDB. This is common also between different MySQL versions). This should not be a problem as most people don't load new storage engines and MariaDB comes with more storage engines than MySQL.
  • CHECKSUM TABLE may give different result as MariaDB doesn't ignore NULL's in the columns as MySQL 5.1 does (Future MySQL versions should calculate checksums the same way as MariaDB). You can get the 'old style' checksum in MariaDB by starting mysqld with the --old option. Note however that that the MyISAM and Aria storage engines in MariaDB are using the new checksum internally, so if you are using --old, the CHECKSUM command will be slower as it needs to calculate the checksum row by row.
  • The slow query log has more information about the query, which may be a problem if you have a script which parses the slow query log.
  • MariaDB by default takes a bit more memory than MySQL because we have by default enabled the Aria storage engine for handling internal temporary tables. If you need MariaDB to take very little memory (at the expense of performance), you can set the value of aria_pagecache_buffer_size to 1M (the default is 128M).
  • If you are using new command options, new features of MariaDB or new storage engines, you can't move easily back and forth between MySQL and MariaDB anymore.

Old, Unsupported Configuration Options

If you are using any of the following options in your /etc/my.cnf or other my.cnf file you should remove them. This is also true for MySQL 5.1 or newer:

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  • skip-bdb

Replacing a MySQL RPM

If you uninstalled a MySQL RPM to install MariaDB, note that the MySQL RPM on uninstall renames /etc/my.cnf to /etc/my.cnf.rpmsave.

After installing MariaDB you should do the following to restore your old configuration options:

mv -vi /etc/my.cnf.rpmsave /etc/my.cnf

Incompatibilities between MariaDB and MySQL-Proxy

A MySQL client API is able to connect to MariaDB using MySQL-Proxy but a MariaDB client API will receive progress reporting informations that MySQL-Proxy does not implement, to get full compatibility in all case just disable progress reporting on the client or server side.

Another option is to use the MariaDB MaxScale proxy, that works with both MySQL and MariaDB.


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