Tag Archives: PostgreSQL

Open Liberty is an interesting new OSS Java EE application server that originated from WebSphere Liberty. You can configure Open Liberty to use PostgreSQL as its default data source as follows: Add directives for <datasource>, <jdbcDriver>, and <library> to the server.xml configuration: <?xml version="1.0" encoding="UTF-8"?> <server description="OpenLiberty Java EE 8 Server"> <featureManager> <feature>javaee-7.0</feature> </featureManager> <httpEndpoint id="defaultHttpEndpoint" host="*" httpPort="9080" httpsPort="9443"/> <keyStore ...

When it comes to performance tuning an environment, often the first place to start is with the database. The reason for this is that most applications rely very heavily on a database of some sort. Unfortunately, databases can be one of the most complex areas to tune. The reason I say that is because tuning a database service properly often ...

In the recent blog post SPOOLing Queries with Results in psql, I looked briefly at some PostgreSQL database psql meta-commands and options that can be used to emulate Oracle database‘s SQL*Plus spooling behavior. In that post, I wrote, “I have not been able to figure out a way to … have both the query and its results written to the ...

One potential surprise for someone familiar with Oracle database‘s SQL*Plus when being introduced to PostgreSQL database‘s psql may be psql‘s default enabling of autocommit. This post provides an overview of psql’s handling of autocommit and some related nuances. By default, Oracle’s SQL*Plus command-line tool does not automatically commit DML statements and the operator must explicitly commit these statements as part ...

The Oracle database requires that no more than 1000 entries be used in a SQL IN portion of a WHERE clause and will throw an ORA-01795 error if that number is exceeded. If a value needs to be compared to more than 1000 values, approaches other than use of IN must be applied. I wondered if this limitation applies to ...

Table Of Contents 1. Introduction 2. Distributed systems: the CAP theorem 3. Relational data stores 3.1. MySQL / MariaDB 3.2. PostgreSQL 3.3. Others 4. Why NoSQL? 5. Key/Value data stores 5.1. DynamoDB 5.2. Memcached 5.3. Redis 5.4. Riak 5.5. Aerospike 5.6. FoundationDB 6. Columnar data stores 6.1. Accumulo 6.2. Cassandra 6.3. HBase 7. Graph data stores 7.1. Neo4J 7.2. Titan ...

In the past I’ve written a couple of articles (Building a REST service in Scala with Akka HTTP, Akka Streams and reactive mongo and ReactiveMongo with Akka, Scala and websockets) which used MongoDB to push updates directly from the database to a Scala application. This is a very nice feature if you just want to subscribe your application to a ...

Both the Oracle database and the PostgreSQL database use the presence or absence of double quotes to indicate case sensitive or case insensitive identifiers. Each of these databases allows identifiers to be named without quotes (generally case insensitive) or with double quotes (case sensitive). This blog post discusses some of the potential negative consequences of mixing quoted (or delimited) identifiers ...

It can be handy to pass a collection of strings to a PL/pgSQL stored function via a PostgreSQL array. This is generally a very easy thing to accomplish, but this post demonstrates a couple of nuances to be aware of when passing an array to a PL/pgSQL function from JDBC or psql. The next code listing is for a contrived ...