Tables with Memoptimize for Write (fast ingest)

Hi There, this is the second part of this post: http://mustafakalayci.me/2022/02/15/tables-with-memoptimize-for-read/ Oracle adda new feature called memoptimized tables for mostly devices like IoTs. Fast lookup and fast ingest tables. I have already mentioned about fast lookup (memoptimize for read) tables in my previous post and now I want to write about Fast Ingest tables. as […]

Tables with Memoptimize for Read (fast lookup)

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 table hash cluster. instead of […]

How to Restore Dropped PDB

Hi, it seems easy, right? Well, not that much but not that hard either. if you drop a pdb in a cdb, you cannot restore it using current database because when you drop the pdb, all information about the pdb is lost. So, what is the solution? you need a point in time recovered duplicated […]

CONTAINER_DATA for Common Users

Hello Everyone (if anyone reading this 🙂 ), it has been a long year and I am glad it is over. As always, we hope the for “a time of period” like new year, birthday etc etc but hope is the only thing that we can hold on. I hope whole world get rid of […]

How to Demonize Apex V Function!

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 am dealing with many sql […]

Hierarchical Blocking Session List

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 connect by (or with clause) […]

Subquery Caching

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 (or dml) statements. There is […]

Why should you use PLSQL_OPTIMIZE_LEVEL as 3

Hi, As you know PLSQL_OPTIMIZE_LEVEL parameter is used to optimize the codes while compiling them and it is really important. By default it’s value is 2 but you can increase it to 3 and you should, here is why. before begin, this is an extension for this post: http://mustafakalayci.me/2020/06/26/performance-gain-of-nocopy-parameters/ Very much thanks to Stephan Borsodi who […]