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blog talks pgloader mastering postgresql dimitri fontaine postgresql major contributor blog about yesql mastering postgresql github twitter categories rss batch updates and concurrency monday 23 jul 2018 postgresql , yesql this article fits in the postgresql concurrency series, where we installed a tweeter like application schema and had all the characters from shakespeare’s a midsummer night’s dream tweet their own lines in our database in postgresql concurrency: data modification language . a previous article in the series covered how to manage concurrent retweets in an efficient way: computing and caching , where we learn how to maintain a cache right in your postgresql database, thanks for materialized views. we even went as far as maintaining an external cache in another application layer using postgresql listen and notify features and a golang application. today’s article is going to address concurrency in the context of updating data in a batch. this activity is quite common, as soon as your system is connected to other systems either internally or with external providers. while it’s pretty easy to ingest new data, and easy enough to update data from an external source when nothing happens in your database, doing the operation safely with concurrent activity is more complex. once more though, postgresql comes with all the tooling you need to handle that situation. postgresql listen/notify thursday 19 jul 2018 postgresql , yesql this article fits in the postgresql concurrency series, where we installed a tweeter like application schema and had all the characters from shakespeare’s a midsummer night’s dream tweet their own lines in our database in postgresql concurrency: data modification language . a previous article in the series covered how to manage concurrent retweets in an efficient way: computing and caching , where we learn how to maintain a cache right in your postgresql database, thanks for materialized views. today’s article shows how to maintain an external cache in another application layer. in this article we are going to maintain an in-memory cache in a golang service, using postgresql listen and notify features. postgresql event based processing monday 16 jul 2018 postgresql , yesql in the previous article of the series modeling for concurrency , we saw how to model your application for highly concurrent activity. it was a follow-up to the article entitled postgresql concurrency: isolation and locking , which was a primer on postgresql isolation and locking properties and behaviors. today’s article takes us a step further and builds on what we did in the previous articles in our series. after having had all the characters from shakespeare’s a midsummer night’s dream tweet their own lines in our database in postgresql concurrency: data modification language , and having had them like and retweet a lot in postgresql concurrency: isolation and locking , we saw how to manage concurrent retweets in an efficient way in computing and caching . what we did implement in the previous article is a cache system, all with its necessary cache invalidation policy . sometimes though, the processing of an event needs to happen within the same transaction where the event is registered in your system. postgresql makes it possible to maintain a summary table transactionally thanks to its trigger support. today, we’re going to dive in how to maintain a summary table with triggers, and its impact on concurrency. computing and caching friday 13 jul 2018 postgresql , yesql let’s continue to dive in postgresql concurrency. in the previous article of the series, modeling for concurrency , we saw how to model your application for highly concurrent activity. it was a follow-up to the article entitled postgresql concurrency: isolation and locking , which was a primer on postgresql isolation and locking properties and behaviors. today’s article takes us a step further and builds on what we did in the previous articles in our series. after having had all the characters from shakespeare’s a midsummer night’s dream tweet their own lines in our database in postgresql concurrency: data modification language , and having had them like a retweet a lot in postgresql concurrency: isolation and locking , it’s time to think about how to display our counters in an efficient way. in this article, we’re going to think about when we should compute results and when we should cache them for instant retrieval, all within the sql tooling. the sql tooling for handling cache is a materialized view , and it comes with cache invalidation routines, of course. modeling for concurrency tuesday 10 jul 2018 postgresql , yesql let’s continue to dive in postgresql concurrency. last week’s article postgresql concurrency: isolation and locking was a primer on postgresql isolation and locking properties and behaviors. today’s article takes us a step further and builds on what we did last week, in particular the database modeling for a tweet like application. after having had all the characters from shakespeare’s a midsummer night’s dream tweet their own lines in our database in postgresql concurrency: data modification language , it’s time for them to do some actions on the tweets: likes and retweet. of course, we’re going to put concurrency to the test, so we’re going to have to handle very very popular tweets from the play! postgresql concurrency: isolation and locking tuesday 03 jul 2018 postgresql , yesql postgresql is a relational database management system. it’s even the world’s most advanced open source one of them. as such, as its core, postgres solves concurrent access to a set of data and maintains consistency while allowing concurrent operations. this article is a primer on postgresql isolation and locking properties and behaviors. you might be interested into the previous article in the series: postgresql concurrency: data modification language . postgresql concurrency: data modification language monday 25 jun 2018 postgresql , yesql postgresql is a relational database management system. it’s even the world’s most advanced open source one of them. as such, as its core, postgres solves concurrent access to a set of data and maintains consistency while allowing concurrent operations. postgres exposes its concurrency apis in the sql language, in particular in the dml parts of it: you can read the data manipulation language chapter of the postgresql docs for all the details. postgresql data types thursday 24 2018 postgresql , yesql today it’s time to conclude our series of postgresql data types articles with a recap. the series cover lots of core postgresql data types and shows how to benefit from the postgresql concept of a data type: more than input validation, a postgresql data type also implements expected behaviors and processing functions. this allows an application developer to rely on postgresql for more complex queries, having the processing happen where the data is, for instance when implementing advanced join operations, then retrieving only the data set that is interesting for the application. postgresql data types: point monday 07 2018 postgresql , yesql continuing our series of postgresql data types today we’re going to introduce the postgresql point type. in order to put the point datatype in a context where it makes sense, we’re going to download a complete geolocation data set and normalize it, thus making good use of both the normalization good practice and those other postgresql data types we’ve been learning about in the previous articles of this series. buckle-up, this is a long article with a lot of sql inside. postgresql data types: enum wednesday 02 2018 postgresql , yesql continuing our series of postgresql data types today we’re going to introduce the postgresql enum type. this data type has been added to postgresql in order to make it easier to support migrations from mysql. proper relational design would use a reference table and a foreign key 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