DBMS_PIPE Connecting the Sessions Mustafa, 2023-08-182023-08-18 Hi, It has been a long time since I wrote something. It is summer and I was in a long vacation. Well I worked mostly of course but at least get away a little bit. In this post I would like to talk about PIPEs in Oracle Database. It is… Continue Reading
DBCA Templates and Dangerous “General Purpose” Template Mustafa, 2023-05-11 Hi, I still see that many dba is creating their databases using “General Purpose or Transaction Processing” template. Why you shouldn’t use it? Because it is way too general! if you click the “view details” on the right: Almost all the “Components” are true. So it installs everything even… Continue Reading
lsnrctl or new db connection is too slow Mustafa, 2022-07-202022-07-21 Hello everyone, I know this is not new but I haven’t seen this problem for a long time and it takes a while to find out it. A team leader (who is an elder brother to me) from the company I started to my first job called me and asked… Continue Reading
SESSION_CACHED_CURSORS Parameter and How can It Affect the Database Mustafa, 2022-07-02 Hello, Let’s talk about the SESSION_CACHED_CURSORS parameter. It might have significant affect on your system so understanding how it works and what it cause is important. This parameter limits the number of cached cursors on the session. As you know there is 2 kind of parse SOFT and HARD. Hard… Continue Reading
Hierarchical Blocking Session List Mustafa, 2021-10-19 Hi, Today, I needed to list all blocking sessions hierarchically. As you know, all information about sessions (and blocking sessions) are in gv$session (or just v$session if you are using single instance) view. I wanted to see who is blocking who and blocker at the top. you can write simple… Continue Reading
Subquery Caching Mustafa, 2021-10-172021-11-19 Hi, I want to talk about very sweet performance “trick”. I love when I do something small and gain a lot 🙂 Today, I will demonstrate subquery caching in Oracle and try to explain how it works and it’s limitations. Probably, you are using some plsql functions in your select… Continue Reading
Direct Path Insert &/vs Conventional Insert Mustafa, 2020-10-27 Hi there, I couldn’t write anything for a while. Those days were busy. So I would talk to about direct path insert and conventional insert. Many people think that they are using “direct path insert” when used sqlldr utility but they are not. it is easy to confused batch insert… Continue Reading
Oracle Table Compression Part1 Mustafa, 2020-09-10 Hi, I have been dealing with table compression a lot during my development period and I still do. I wanted to share some information about table information but I believe this will be a long explanation so I will write them in parts and this is part1. Table compression is… Continue Reading
Redo Log Switch Order Mustafa, 2020-09-032020-09-04 Hi, I always have the impression that redo log switch occurs in group number order but a small test showed me, I was wrong. As you know redo log is one of the most important part of a Oracle database. it almost protect everything! your data in memory, data file,… Continue Reading