I mean that quite literally, it is a pleasure to read, especially since they went into such. 3, Written in, The initial development of. ago Can't believe nobody mentioned why Uber moved from MySQL to postgres and then back from postgres to MySQL Mvcc creates a new row on every update. information in how PostgreSQL vs MySQL performed in their environment. The Uber Engineering group have posted a really great blog post about their move from Postgres to MySQL. PostgreSQL vs MySQL: Differences 2, Type of Database, PostgreSQL is based on ORDBMS. In addition to sending all of the WAL updates from West Coast to East Coast, we archived all WALs to a file storage web service, both for extra assurance that we could restore data in the event of a disaster and so that archived WALs could bring up new replicas from database snapshots. A PostgreSQL Response to Uber Christophe Pettus PostgreSQL Experts, Inc. In many cases, we found MySQL more favorable for our uses. This bandwidth problem also caused issues for us with WAL archival. In addition to explaining some of Postgres’s limitations, we also explain why MySQL is an important tool for newer Uber Engineering storage projects, such as Schemaless. Some of the worlds largest Web-Scale applications (e.g., Facebook, Uber) uses MySQL. Purchasing very high bandwidth cross-country links is expensive, and even in cases where money is not an issue it’s simply not possible to get a cross-country networking link with the same bandwidth as a local interconnect. MySQL, Oracle, PostgreSQL, Microsoft SQL Server, MongoDB, Redis.
However, the verbosity of the Postgres replication protocol can still cause an overwhelming amount of data for a database that uses a lot of indexes. Cascading replication limits the inter–data center bandwidth requirements to the amount of replication required between just the master and a single replica, even if there are many replicas in the second data center.
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