In this post I would like to describe a behavior of Oracle Database that, at least for me, isn’t obvious at all. Actually, it’s something that I can’t explain why it works in that way. Let’s start by setting the scene by describing the schema I’m using for the following tests. As you can see […]
Analysing Row Lock Contention with LogMiner
Recently I had to analyse a row lock contention problem that can be illustrated by the following test case: A session (let’s call it #1) creates a table and inserts a row into it (note that “n” is the primary key of the table): SQL> CREATE TABLE t (n NUMBER PRIMARY KEY); SQL> VARIABLE n […]