Neues vom PostgreSQL Planet
The folks at TimescaleDB have published their "State of Postgres" survey results in a new micro-site where you can find a summary of responses, some more detailed analysis, and the source data from the survey. This survey was conducted for about 2 months during the late summer/early fall of 2019 and while I haven't gone through all the raw data as of yet, after reading the results... well, I have some opinions.
How do you know if the next update to your software is ready for hundreds of millions of customers? It starts with data. And when it comes to Windows, we’re talking lots of data. The Windows team measures the quality of new software builds by scrutinizing 20,000 diagnostic metrics based on data flowing in from 800 million Windows devices.
PostgreSQL 12 has a very interesting feature to turn on when doing an execution plan analysis.PostgreSQL 12 EXPLAIN SETTINGS
PostgreSQL 12 has a new feature that can be turned on in the EXPLAIN output: SETTINGS. This option provides some information about all and only those parameters that can affect an execution plan if and only if they are not at the default setting.
What does it mean in practice? Let’s see an old plain EXPLAIN:
SQL is query a language that is usually pretty easy to read. However, if people don’t format their queries properly even SQL turn out to be a nightmare. That’s why developers often turn to an SQL beautifier to turn an ugly query into a nicely formatted string. Various tools are available on the web to achieve exactly that.
Can the same thing be achieved using only PostgreSQL onboard tools? The answer is yes. This post will show you how to achieve that.
There is a less-talked-about improvement in PostgreSQL 12 which can greatly reduce the benign log entries. This patch is probably one of the smallest in PostgreSQL 12.
The commit message says:
Version 12 of PostgreSQL is not exactly fresh out of the oven, as the first minor release was already announced. However, I think it’s fair to say that this version can be still considered fresh for most users, and surely only a small percentage of users has upgraded. So I think it makes sense to go over some new features. This will be my last article beating on the v12 drum though, I promise
Image © Laurenz Albe 2019
If you thought that the B-tree index is a technology that was perfected in the 1980s, you are mostly right. But there is still room for improvement, so PostgreSQL v12 (in the tradition of v11) has added some new features in this field. Thanks, Peter Geoghegan!
In this article, I want to explain some of these improvements with examples.
PostgreSQL does not use IN-PLACE update mechanism, so as per the way DELETE and UPDATE command is designed,
with_llvm=no make -e