Frequently Asked Questions

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On this page you can find the most frequently asked questions regarding MSSQL-MySQL Sync. If your question is not answered here, please contact us via Feedback Form

What versions of MS SQL are supported?
MSSQL-MySQL Sync works with all versions of MS SQL including Azure SQL.
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What versions of MySQL are supported?
MSSQL-MySQL Sync works with all versions of MySQL including such forks (variations) as MariaDB and Percona.
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Does MSSQL-MySQL Sync require MS SQL server installation?
MSSQL-MySQL Sync requires MS SQL environment (server or client components of MS SQL must be installed on the same machine where you run MSSQL-MySQL Sync from).
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What is "full" and "incremental" synchronization?
MSSQL-MySQL Sync uses full synchronization to make source and destination tables identical at first run, when the program does not have information about difference between those two tables. Full synchronization includes two phases:

If "drop synchronization" is OFF, the second step is omitted. Full synchronization can take a long time on large tables since it requires reading entire source and destination tables record by record.

Incremental synchronization updates only rows that were inserted, updated or deleted in the source table. This option is available starting from the second run of MSSQL-MySQL Sync, after the program prepared all necessary objects to store history of changes.
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How to specify custom MS SQL port (other than 1433)?
You can specify custom port on 'Step 1 of 6' wizard page in 'MS SQL Server' field as follows:
 
Sql_server_name,1234
 
where 1234 is the custom port.
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All table names include schema name as a prefix. How can I avoid it?
By default the program lists all tables found in the database. Because different schemas could contain tables with the same name, MSSQL-MySQL Sync compose full table name as [schema name].[table name] to guaranty that it is unique. If you need to work with tables owned by the user specified, select "View tables owned by the user" checkbox on "Select Databases" wizard page. This will force the program to not include schema name as prefix.
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I can see strange table "__history__" and some triggers created in the database being synchronized. Why?
MSSQL-MySQL Sync creates this table and triggers in order to implement incremental synchronization i.e. synchronize only the data that has been updated since previous run.
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What is the difference between synchronization in MSSQL-to-MySQL and MSSQL-MySQL Sync?
MSSQL-to-MySQL implements only full one-direction synchronization from MS SQL to MySQL and it cannot do incremental synchronization in next runs. MSSQL-MySQL Sync implements full bi-directional synchronization between MS SQL and MySQL. Also, it can do incremental synchronization i.e. update only data being changed.
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After running full synchronization in demo version of MSSQL-MySQL Sync, source and destination tables are not identical. Why?
Demo version of MSSQL-MySQL Sync scans only first 50 rows in each table for synchronization purpose. This limitation does not appear in full version of the product.
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How can MSSQL-MySQL Sync connect to Azure SQL?
See How to connect to Azure SQL article for related information.
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It is possible to connect to MySQL over SSH with MSSQL-MySQL Sync?
Yes, MSSQL-MySQL Sync supports SSH connection to MySQL server. Please refer to this article for the further information.
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Does MSSQL-MySQL Sync support automation?
The product does not support automation directly. However, there is console version of the program m_sagent.exe in the installation directory. It supports command line arguments and can be called from any script. So, it is possible to write a simple batch script and execute it recurrently using Windows Task Scheduler. Please refer to "Command line" article of the product documentation to learn more about m_sagent.exe.
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How to uninstall MSSQL-MySQL Sync?
If you need to remove MSSQL-MySQL Sync products from your computer, you can use "Add or Remove Programs" option in the Windows Control Panel.
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