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?
PostgreSQL-MySQL Sync works with all versions of MS SQL including Azure SQL.
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What versions of MySQL are supported?
PostgreSQL-MySQL Sync works with all versions of MySQL including such forks (variations) as MariaDB and Percona.
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Does PostgreSQL-MySQL Sync require MS SQL server installation?
PostgreSQL-MySQL Sync requires MS SQL environment (server or client components of MS SQL must be installed on the same machine where you run PostgreSQL-MySQL Sync from).
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What is "full" and "incremental" synchronization?
PostgreSQL-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 PostgreSQL-MySQL Sync, after the program prepared all necessary objects to store history of changes.
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I can see strange table "__history__" and some triggers created in the database being synchronized. Why?
PostgreSQL-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 PostgreSQL-to-MySQL and PostgreSQL-MySQL Sync?
PostgreSQL-to-MySQL implements only full one-direction synchronization from MS SQL to MySQL and it cannot do incremental synchronization in next runs. PostgreSQL-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 PostgreSQL-MySQL Sync, source and destination tables are not identical. Why?
Demo version of PostgreSQL-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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It is possible to connect to MySQL over SSH with PostgreSQL-MySQL Sync?
Yes, PostgreSQL-MySQL Sync supports SSH connection to MySQL server. Please refer to this article for the further information.
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Does PostgreSQL-MySQL Sync support automation?
The product does not support automation directly. However, there is console version of the program s_pagent.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 s_pagent.exe.
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How to uninstall PostgreSQL-MySQL Sync?
If you need to remove PostgreSQL-MySQL Sync products from your computer, you can use "Add or Remove Programs" option in the Windows Control Panel.
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