Infrastructure at your Service
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…
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…
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,…
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…
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…
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,…
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…
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…
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…
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…
