![]() ![]() continuously replicating data from the primary to one or more standbysĪlthough these ideas will be explained in further detail throughout this post, let’s briefly explore how they all work together to make PostgreSQL an efficient, reliable database.querying data from the shared buffer cache and on disk.using multi-version concurrency control to manage data updates.PostgreSQL’s work extends across four main areas: The diagram below takes a closer look at how PostgreSQL stores data across rows within each page/block of a table. We’ll also cover write-ahead logs in more detail in a later section of this post. You may see the terms “block” and “page” used interchangeably-the only difference is that a page includes a header that stores metadata about the block, such as information about the most recent write-ahead log entry that affects tuples in its block. If your data contains field values that exceed this limit, PostgreSQL TOAST (The Oversized-Attribute Storage Technique) is designed to help accommodate this need (consult the documentation to see which data types are eligible for TOAST storage). Prior to that release, PostgreSQL has left it largely up to users to implement their own approaches to replication and load balancing across databases, typically involving some form of logical and/or physical data partitioning.Įach database table stores rows of data as an array of 8-KB pages, or blocks. PostgreSQL 10 was the first release to include built-in support for logical replication. Most notably, a PostgreSQL database cluster is not a collection of servers, but a collection of databases managed by a single server. ![]() PostgreSQL terminology + overviewīefore diving into the key metrics for PostgreSQL monitoring, let’s briefly walk through some terminology. Today, many organizations and companies, including Cisco, Fujitsu, and Datadog, utilize PostgreSQL as a reliable, robust data storage solution. PostgreSQL ensures data integrity and reliability with built-in features like Multi-Version Concurrency Control (MVCC) and write-ahead logging. PostgreSQL, or simply “Postgres,” is an open source, object-relational database system that was developed out of the POSTGRES project at the University of California, Berkeley. ![]()
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