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Category Archives: Oracle

Oracle Team

MERGE JOIN CARTESIAN: a join method or a join type?

By | Oracle | No Comments

By Franck Pachot . I’ll present about join methods at POUG and DOAG. I’ll show how the different join methods work in order to better understand them. The idea is to show Nested Loops, Hash Join, Sort Merge Join, Merge Join Cartesian on the same query. I’ll run a simple join between DEPT and EMP with the USE_NL, USE_HASH, USE_MERGE and USE_MERGE_CARTESIAN hints. I’ll show the execution plan, with SQL Monitoring in text mode. And…

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Pascal Brand

New installed Fusion Middleware Reports or Forms WebLogic Servers fails to start after configuring SSL

By | Application integration & Middleware, Oracle | No Comments

We installed a Fusion Middleware reports and Forms 12.2.1.2.0 on a Linux Server. Those are single node Reports and Forms WebLogic Servers. After disabling the Non SSL Listen Port, we got the below error in the WebLogic Servers log files while starting the Managed Server with only SSL ports enabled. ####<Aug 19, 2017 9:22:44 PM GMT+00:00> <Notice> <Security> <host01.example.com> <WLS_Reports> <[ACTIVE] ExecuteThread: ‘0’ for queue: ‘weblogic.kernel.Default (self-tuning)’> <<WLS Kernel>> <> <> <1320441764877> <BEA-090082> <Security initializing…

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Oracle Team

How much free space can be reclaimed from a segment?

By | Oracle | No Comments

By Franck Pachot . You have the feeling that your table takes more blocks than it should? Here are the queries I use to quickly check the free space. The idea is to call DBMS_SPACE.SPACE_USAGE and infer the minimum space from the percentages. For example, a block in FS3 (defined as having at least 50 to 75% free space) is supposed to have at least 50% of free space. Of course it can have more,…

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Oracle Team

Oracle 18c preinstall RPM on RedHat RHEL

By | Oracle | No Comments

By Franck Pachot . The Linux prerequisites for Oracle Database are all documented but using the pre-install rpm makes all things easier. Before 18c, this was easy on Oracle Enterprise Linux (OEL) but not so easy on RedHat (RHEL) where the .rpm had many dependencies on OEL and UEK. Now that 18c is there to download, there’s also the 18c preinstall rpm and the good news is that it can be run also on RHEL…

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Petre Radut

Upgrade Oracle Grid Infrastructure from 12.1.0.2.0 to 12.2.0.1.0

By | Database Administration & Monitoring, Database management, Oracle | No Comments

The following blog will provide the necessary steps to upgrade the Grid Infrastructure from 12.1 to 12.2, for a Standalone Server. One of the new features of GI 12.2 is the usage of the AFD (Oracle ASMFD Filter Driver). Assumptions : You have installed Oracle GI 12.1 as grid user You have installed Oracle Database 12.1 as oracle user You have configured the groups asmadmin,asmoper,asmdba You installed oracle-rdbms-server-12cr2-preinstall rpm You patched your Oracle GI to…

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Jérôme Dubar

Patching ODA lite to 12.2.1.4.0

By | Database Administration & Monitoring, Database management, Oracle | No Comments

Here is how to apply the latest patch for your ODA. As usual the Oracle documentation is not 100% accurate. I applied this patch on 2 ODAs X7-2M previously deployed in 12.2.1.2.0, no intermediate patch was needed. 1) Download the patch The patch number is 28216794. This patch will update the following components:  dcs (odacli), operating system, bios/firmwares, ilom, GI, dbhomes and databases. Download and copy the patch to a temporary folder on the server,…

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Michael Hein

Logical standby: No view for data guard status on session level

By | Database management, Oracle | No Comments

On logical standby you have to switch off data guard at least on session level to make modifications on objects which are maintained by data guard. This is done by command alter session disable guard; Dataguard can be reenabled for this session by issuing alter session enable guard; For executing these commands “alter database” privilege is at least needed, which is often not liked by IT security staff. Command “alter session disable guard” is also…

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Oracle Team

Release 18.0.0.0.0 Version 18.3.0.0.0 On-Premises binaries

By | Oracle | No Comments

By Franck Pachot . Good news, the latest Patchset for Oracle 12cR2 (which is not named patchset anymore, is actually called release 18c and numbered 18.0.0.0.0) is available for download on OTN. It is great because OTN download does not require access to Support and Software Updates. It is available to anybody under the Free Developer License Terms (basically development, testing, prototyping, and demonstrating for an application that is not in production and for non-commercial…

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Petre Radut

New features and known issues with RMAN tool on Oracle database 12.1.0.2

By | Database Administration & Monitoring, Oracle | 3 Comments

Oracle Database 12c has new enhancements and additions in Recovery Manager (RMAN). The RMAN tool continues to enhance and extend the reliability, efficiency, and availability of Oracle Database Backup and Recovery. Below, I will mention couple of new features for the RMAN duplicate command, but also how to avoid issues that can happen on the creation of the temporary files. FEATURES: <INFO>Using BACKUPSET clause : In previous releases, active duplicates were performed using implicit image…

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Petre Radut

Control File issues on duplicating with non patched Oracle version.

By | Database Administration & Monitoring, Oracle | No Comments

Introduction : RMAN has the ability to duplicate, or clone, a database from a backup or from an active database. It is possible to create a duplicate database on a remote server with the same file structure, or on a remote server with a different file structure or on the local server with a different file structure. For some old and  non patched Oracle versions such as that earlier than 11.2.0.4 , the duplicate (from…

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