Following the long-term trend of using free open-source software, MySQL and PostgreSQL became the most popular database management systems. So, it is not surprising that many projects require to store and update the data in these two DBMS simultaneously. To achieve this goal database specialists run database synchronization, the sequence of step to keep the source and destination data up to date.
There are multiple approaches to database synchronization. One of the most effective synchronizing methods is known as incremental synchronization. This technique requires to collect updated data of the source database and replicate the changes into the destination database on real-time basis. Obviously, the products running incremental synchronization provide excellent performance because of the lowest volume of the data processed. Reducing volume of data to synchronize is especially important for large corporate scale MySQL and PostgreSQL warehouses operating with low-latency data over heterogeneous network.
There are two techniques of incremental synchronization between MySQL and PostgreSQL:
- Transaction Log-based
- Trigger-based
Database synchronization based on transaction log approach is using the fact that both MySQL and PostgreSQL have logging feature. In MySQL it is the binary log that contains entries specifying changes to table data. PostgreSQL provides Write-Ahead Logging (WAL) option that captures binary changes to the data files. In both DBMS those transaction logs can be accessed via native plugins. Following this way changelog data is exported in service table of required format and then replicated into the target database to keep its data synchronized with the source.
Trigger-based method of database synchronization requires building triggers on insert, update and delete for each table being synchronized from the source database. Each of these triggers serializes any modifications of the corresponding table into the changelog. The synchronization tool iterates all entries of that changelog and replicates all changes into the destination database.
Incremental synchronization between MySQL and PostgreSQL according to one the techniques specified above requires writing a lot of sophisticated DML code that is hard to implement manually. This is the reason why many database professionals use special synchronization tools. One of these products is MySQL-PostgreSQL Sync developed by Intelligent Converters, software company working in the field of database migration and synchronization.
Key features of MySQL-PostgreSQL Sync:
- High performance incremental trigger-based synchronization
- All versions of MySQL and PostgreSQL running on Linux/Unix and Windows are supported
- Cloud implementations of both DBMS (such as Amazon RDS, Heroku) are supported
- Bi-directional synchronization MySQL->PostgreSQL and PostgreSQL->MySQL
- Command line support
- Synchronization settings are stored into profile
According to corporate policy of Intelligent Converters, MySQL-PostgreSQL Sync is supplied with 24/7 support service and 1-year subscription for updates. More details about the product can be found on the official site: https://www.convert-in.com/s2psync.htm