/dev/shm is a temporary file storage filesystem (see tmpfs) that uses RAM for the storage. It can function as shared memory that facilitates IPC. It is a…
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Author: Bulent Soylu
How much memory is truly used by my Oracle instance?
There are many posts about the amount of memory that is taken by the Oracle database executables and the database SGA and PGA. The reason…
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How to trace SQL sessions to identify Oracle Database bottlenecks
Want your database to run faster? While common tuning techniques can prove quite helpful in resolving many performance issues, they don’t show the details of all the…
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How to get access to download older Oracle versions?
In the Software Delivery Cloud (formerly known as eDelivery) you will find the following base releases of the Oracle database: And the other source for downloads is oracle.com.…
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Oracle COMPATIBLE VS OPTIMIZER_FEATURES_ENABLE
COMPATIBLE PARAMETER Understanding the COMPATIBLE Initialization ParameterIn Oracle Database 19c, when the COMPATIBLE initialization parameter is not set in your parameter file, the COMPATIBLE parameter…
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Why you shouldn’t set OPTIMIZER_FEATURES_ENABLE
Roy today answered an interesting question on one of our internal mailing lists. And this reminds me to pick up that piece of information as…
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MEMORY_TARGET, SGA_TARGET and PGA_AGGREGATE_TARGET
The memory structures that must be managed are the system global area (SGA) and the instance program global area (instance PGA). Oracle Database supports various…
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Oracle SQL profile and baselines
This post highlights the differences between SQL profile and baselines in Oracle® and explains how it works when tuning a query. Optimizer, profile, and baseline…
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How to upgrade ORACLE 11G to 19C
My Environment for this practice Prerequisites: Before starting the upgrade make sure you have done the below checklist: Stop the Listener Take full database backup…
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Upgrade Database From 11g To 12c Manually
A database can be upgraded either using DBUA or manual method. But for major production databases, it is better to do it manually, so that…
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