UPDATE Please read also about this change in Pg 9.1, and this change in Pg 9.2 posts, as they explain that since Pg 9.1 some of the limitations listed in this post are no longer there. END OF UPDATE Fight! But more seriously – people tend to use various data types, and there have been … Continue reading “CHAR(x) vs. VARCHAR(x) vs. VARCHAR vs. TEXT – UPDATED 2010-03-03”
First of all – I base information in this post on Linux, so if you are using another operating system – it’s quite likely that it will not help you. Second – if you’re using Linux, you have probably some package manager – dpkg, rpm, pacman, poldek, whatever. Right? So, it should be easy to … Continue reading “Installing PostgreSQL”
On 12th of February Tom Lane committed patch by Hitoshi Harada: Log Message: ———– Extend the set of frame options supported for window functions. This patch allows the frame to start from CURRENT ROW (in either RANGE or ROWS mode), and it also adds support for ROWS n PRECEDING and ROWS n FOLLOWING start … Continue reading “Waiting for 9.0 – extended frames for window functions”
On 1st of Februyary, Takahiro Itagaki committed a patch by Pavel Stehule which adds string_agg aggregate: Log Message: ———– Add string_agg aggregate functions. The one argument version concatenates the input values into a string. The two argument version also does the same thing, but inserts delimiters between elements. Original patch by Pavel Stehule, reviewed … Continue reading “Waiting for 9.0 – string_agg”
I tend to write about new features in new versions of PostgreSQL, but this patch actually fixes one of the things that annoy me a lot, so here it goes: On 26th of January, Simon Riggs committed: Log Message: ———– Fix longstanding gripe that we check for 0000000001.history at start of archive recovery, even when … Continue reading “Waiting for 9.0 – removal of 0000000001.history check”
On 19th of January Tom Lane committed really brilliant patch: Log Message: ———– Add pg_table_size() and pg_indexes_size() to provide more user-friendly wrappers around the pg_relation_size() function. Bernd Helmle, reviewed by Greg Smith
The BIG feature. The feature that made PostgreSQL leap from 8.4 to 9.0. Patch was written by Fujii Masao, and committed by Heikki Linnakangas on 15th of January 2010: Log Message: ———– Introduce Streaming Replication. This includes two new kinds of postmaster processes, walsenders and walreceiver. Walreceiver is responsible for connecting to the primary … Continue reading “Waiting for 9.0 – Streaming replication”
I’ve written 29 posts about new features in 8.5. And now core team decided to name it 9.0. Great. And now I have to make changes in all of these posts. Just kidding – change is simple – I just added tag “pg90″ and that’s all. Change from 8.5 to 9.0 emphasizes significance of new … Continue reading “Waiting for … 9.0”
Some time ago Josh Berkus wrote about possible changes in VACUUM FULL. Now these changes came to life. By now, I mean 6th of January, when Takahiro Itagaki committed his patch: Log Message: ———– Support rewritten-based full vacuum as VACUUM FULL. Traditional VACUUM FULL was renamed to VACUUM FULL INPLACE. Also added a new option … Continue reading “Waiting for 8.5 – VACUUM FULL change”
On 15th of December Tom Lane committed patch by Andrew Gierth (aka RhodiumToad), which adds interesting capability: Log Message: ———– Support ORDER BY within aggregate function calls, at long last providing a non-kluge method for controlling the order in which values are fed to an aggregate function. At the same time eliminate the old implementation … Continue reading “Waiting for 8.5 – ordered aggregates”