This example will just be focusing on returning data from user defined functions, specifically returning a value as opposed to using OUT parameters. The full code is on Github. To quickly review, PL/Julia calls jl_eval_string() to execute Julia code and captures the returning jl_value_t data structure, which contains the result of the Julia code executed. […]
One method to handle input parameters with PL/Julia is to rewrite the body of the user defined function or stored procedure on the fly with the values declared as global variables. In order to do that, we need to create a new buffer big enough to hold the new global variable declarations in addition to […]
A PostgreSQL procedural language handler needs to look up the body of the user defined function or stored procedure for the code to execute. Remember that the C function executed to handle PL/Julia user defined functions and stored procedures is defined in the SQL file. Thus the pljulia_call_handler() function needs to be updated to retrieve […]
Julia provides an API so that Julia functions can be called from C. PL/Julia will use this C API to execute Julia code from its user defined functions and stored procedures. Julia’s documentation provides an example C program that starts up the Julia environment, evaluates the expression sqrt(2.0), displays the resulting value to the standard […]
PostgreSQL supports many procedural languages, which can be used to write user defined functions or stored procedures. There are four that are readily available as part of the standard PostgreSQL distribution: PL/pgSQL, PL/Tcl, PL/Perl, PL/Python. Yet procedural languages don’t have to be created as part of the core project. There are a number more that […]
This is a story about how I found myself trying programming languages. I’ve been running an OLTP type database test (DBT-2, if you’ve heard of it), and noticed the post-processing reporting scripts for analyzing the database test results were running longer than I thought they would. I was running tests on 16 systems at the […]
PostgreSQL was presented with the 2019 O’Reilly Open Source Award for Lifetime Achievement in Portland, Oregon, Thursday July 18th during OSCON. I had the honor of accepting that award alongside Bruce Momjian and Christophe Pettus. Starting last year in 2018, these awards were presented to projects and the first Lifetime Achievement award was given to […]
Hopefully you are now regularly collecting system statistics after reading Tomas Vondra’s defense of using sar. If you don’t have anything in place that readily visualizes the data, I have some examples that you can hopefully build off on to see everything you need to see. In addition to sar, the sysstat package also has […]
I had the pleasure of speaking about PostgreSQL performance at The 14th Annual Southern California Linux Expo and meeting many enthusiastic database users in the expo hall. There was a great turnout of people attending the conference, and many PostgreSQL presentations to see. Simon Riggs also talked about SERIALIZABLE, Eventual Consistency and Really Scary Stuff. […]
As people have been working on merging Postgres-XL with the PostgreSQL 9.5 branch, I’ve been trying out Postgres-XL’s ability to run a decision support-like workload. The DBT-3 test kit, originally developed at the OSDL as a TPC-H derivative, has some new changes so that it can run against Postgres-XL. I’ll describe how to use DBT-3 […]
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