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Author: wangts

Postgresql identity column “no owned sequence”

Postgresql 10 introduced identity column which offers better manageability than the old fashioned serial. Refer to this post for more detail I followed the post above and converted most of serial columns into identity, worked all good until one day

wangts July 4, 2020July 4, 2020 Database No Comments Read more

PostgreSQL logical replication

Logical replication was introduced in PostgreSQL 10. It offers better flexibility than stream replication in a number of ways: Publisher and subscriber can be on different major versions Replication can be done at table level, sharing a subset of the

wangts May 8, 2020May 8, 2020 Database No Comments Read more

Use Cloud function to start and stop Cloud sql

We have setup a Cloud sql database for development but would like to save cost by shutting it down during night. This article shows how to achieve this. The overall architecture is Cloud function is used to hold Python code

wangts March 10, 2020March 10, 2020 others 3 Comments Read more

Bigquery parallel loading

There are many ways to load data into BQ but using Python gives us the most control. Below I’m going to demonstrate loading files into BQ in parallel. My test scenario is: 191 csv files, sizing from 10Mb – 1Gb

wangts February 20, 2020February 20, 2020 Programming No Comments Read more

Dates in SAP

My first post on SAP based on my working knowledge. I’m not a SAP support or developer so there are still lots of unknown to me There are so many dates in SAP: Baseline date, net due date, invoice date,

wangts December 31, 2019December 31, 2019 SAP No Comments Read more

Postgresql upgrade from 11.x to 12.1

This is a new post based on my previous “Postgresql upgrade from 9.6 to 10.0“, with necessary updates and corrections. The latest Postgresql 12 (12.1) further improved performance on parallel queries, partitions, automatic (but overridable) inlining of common table expressions (CTEs) .

wangts November 26, 2019November 27, 2019 Uncategorized No Comments Read more

Domain and email hosting

I recently moved my email service to Zoho as the free email service offered by my hosting company (Inmotionhosting) had never been great: delays, failures of sending and sometimes even email loss. OK, it’s a free service so nothing to

wangts June 8, 2019June 8, 2019 Uncategorized 5 Comments Read more

Data recovery tool

I was really amazed by a data recovery tool I recently used – it recovered files used to be on Windows from a Linux formatted disk! A really great tool I highly recommend! The tool R-Studio has Windows, Linux and

wangts February 24, 2019February 24, 2019 Reviews No Comments Read more

Building a PostgreSQL docker container with debugger (pldebugger)

Further to my previous post, I wanted to enable debugging in PostgreSQL Docker container so that it can be used together with PGAdmin4. The challenge is it is not enabled by default in any of available Docker images; I also

wangts December 4, 2018December 4, 2018 Database, virtualisation 2 Comments Read more

Building a development box on Docker

This article is going to show steps and configurations on how to build a development box (PHP CodeIgniter + Apache + PostgreSQL) using Docker on Windows. Why Docker Comparing to VirtualBox, it’s a lot easier and probably faster Portable. Files

wangts June 7, 2018June 7, 2018 Uncategorized No Comments Read more
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