Tag - Replication

Continuous Replication From a Legacy PostgreSQL Version to a Newer Version Using Slony

Native streaming replication in PostgreSQL works only between servers running the same major version. We discussed about logical replication in our previous blog post. In that post, we saw how logical replication could help us set up migration between two different PostgreSQL versions. However, logical replication works only for the currently supported versions of […]

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Replication Between PostgreSQL Versions Using Logical Replication

postgres read replica from primary

When you need to upgrade PostgreSQL, there are a variety of approaches that you can use. To avoid application downtime, then not all of the options to upgrade postgres are suitable. When avoiding downtime is essential, then you might consider using replication as a means of upgrade, and depending on your scenario, you can […]

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Live MySQL Slave Rebuild with Percona Toolkit

MySQL slave data out of sync

Recently, we had an edge case where a MySQL slave went out-of-sync but it couldn’t be rebuilt from scratch. The slave was acting as a master server to some applications and it had data was being written to it. It was a design error, and this is not recommended, but it happened. So how do […]

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Fixing ER_MASTER_HAS_PURGED_REQUIRED_GTIDS when pointing a slave to a different master

gtid auto position

GTID replication has made it convenient to setup and maintain MySQL replication. You need not worry about binary log file and position thanks to GTID and auto-positioning. However, things can go wrong when pointing a slave to a different master. Consider a situation where the new master has executed transactions that haven’t been executed […]

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