Our SaaS PostgreSQL instance is hosted on RDS. Version 13 was using adb.m6g.4xlargeinstance with 16 vCPU and 64 GB of RAM. We were experiencing cache effects on multiple queries: the first run would take several seconds, while subsequent runs took only a few hundred milliseconds. We develo...
Why pgcat? PostgreSQL 内置的逻辑复制有如下缺陷: 只支持普通表作为复制目标 不能过滤复制数据,使得两个机房之间互相复制时发生死循环 不支持表名映射 没有冲突解 暂无标签 https://www.oschina.net/p/pgcat Shell等 3 种语言 Apache-2.0 保存更改
Although we tested Andrey's PostgreSQL patches, we did not feel comfortable deviating from the official PostgreSQL releases. Plus, maintaining a custom patched release over upgrades would add a significant maintenance burden for our infrastructure team. Our self-managed customers would also not benefit ...
Instead of manually including within the string to be concatenated, PostgreSQL also includes aconcat_ws()function that accepts a string separator as the first parameter. We will visit it with these queries: postgres=> SELECT concat_ws('-',333,454,1919) AS cell_num; cell_num --- 333-454-...
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opening the network socket, and PostgreSQL needs to do its own under-the-hood computations to establish that connection. Scale that up to thousands of user sessions, and a lot of time can be wasted just getting the database ready for the user to use. Other costs involved in set...
> > Well, PostgreSQL itself is storing UTC anyways but we need > > the timezone bit since our frontend delivers timestamps from > > various timezones and they are note normalized to UTC before > > they get to the database. >
A simpleSELECTquery in PostgreSQL operates under theMVCC (Multi-Version Concurrency Control)model, which allows it to read data without locking the rows. This means it can see asnapshotof the data at the start of the transaction, regardless of whether other transactions are modifying that data ...
Now that you have a Postgres database with Citus installed (Citus 10.0 or later), you can use your favorite tool—such aspsql—to connect to the database, and start creating distributed tables on your single Citus node. -- Create a table with the usual PostgreSQL syntaxCREATETABLEusers_tabl...
Well … a lot actually. The core problem starts when transactions enter the picture. On might argue “We don't use transactions”. Well, that is wrong. There is no such thing as “no transaction” if you are running SQL statements. In PostgreSQL every query is part of a transaction - ...