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Category: Performance

Guid vs Sequences

Mustafa, 2023-12-29

Hi Everyone, I haven’t written any posts lately because there is so much going on in my life and biggest change is I am moving to the Netherlands. it is a big change for me and my family but I hope everything will be fine (if we can find a…

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How to Compare Two Tables

Mustafa, 2023-10-262023-10-27

Hi, Few days ago, I joined Chris Saxon’s webinar about “how to compare two tables”. Chris is one of the amazing guy in Oracle community and he shared different methods about how to compare two tables and also, strengths and weakness of the methods. before reading my post, I strongly…

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Tables with Memoptimize for Read (fast lookup)

Mustafa, 2022-02-152022-02-15

Hi, I would like to share my initial thoughts about memoptimized for read (fast lookup) tables in this post. fast lookup tables came with 18c and they are here to provide faster access to a table if you are using primary key with a equality condition. this is basically single…

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How to Demonize Apex V Function!

Mustafa, 2021-10-312021-11-04

Hi, Answer of the question in the subject is “Using too much V in SQL statements”. Let’s see why and what should you do. First things first, I am NOT a APEX developer. I am a DBA and Database Developer but some of my clients are using APEX and I…

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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…

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Blockchain vs Immutable tables

Mustafa, 2021-08-202021-10-26

Hi, as you know 21c is here for linux and some new features are (as always) pretty exciting. two of them are Blockchain and Immutable tables. Let’s explain and test. first of all, those are new features for 21c but they are backported to 19c. at 19.10 you are able…

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Pragma UDF & Deterministic

Mustafa, 2021-04-09

Hello everyone, I wanted to write about something simple and can improve the performance of your sql statements. Unfortunately, many database developers use too much plsql function in their SQL statements. I say too much because if you learn more about the SQL, you will use less plsql. SQL is…

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SQL Macro Part2 column_value = nvl(:param, column_value)

Mustafa, 2020-10-302021-09-23

Hi, Since I am working on “SQL Macro”, I am keep testing things. so please see my previous post: https://mustafakalayci.me/2020/10/28/sql-macro-is-finally-here/ as mentioned in previous post, is it possible to get rid of column_value = nvl(:param, column_value) conditions? since they become a huge pain in big and complex queries. I provided…

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SQL Macro is finally here!

Mustafa, 2020-10-282020-10-29

Hi, I was waiting for this for a long time. Finally we can use sql macro in Oracle database. Actually I was excited when I first read about this but after my tests, I stuck at some points. I was hoping to use this as “parameterized views” as in, send…

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