By Mouhamadou Diaw Last day I did some tests with Oratcptest. This a command line tool which can be used to measure network bandwidth and network latency between client and server. In this blog I am going to show how to use this tool in a DataGuard environment. I am using a DataGuard environment with following configuration. 1 2 3…
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…
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.…
By Mouhamadou Diaw In a previous blog I talked about protecting data using Realms. With Database Vault we can also protect our database against some SQL statements. These statements can include SELECT, ALTER SYSTEM, database definition language (DDL), and data manipulation language (DML) statements. We can do this with Command Rules. In this blog I am demonstrating how we can…
By Franck Pachot . Mike Dietrich has blogged recently about upuserxt.lst and upobjxt.lst and how to query them with external table. The first time I’ve seen those ‘.lst’ files, the default extension for sqlplus spool files, I wondered whether they were provided in ?/rdbms/admin on purpose, or if they were just some leftovers from some tests Oracle did before packaging…
The 12.2 finally arrived on ODA and is now available on all generations. Modern ODAs are now supporting 11.2.0.4, 12.1.0.2 and 12.2.0.1 database engines, and these 3 versions can work together without any problem. You probably plan to upgrade some old databases to the latest engine, at least those still running on 11.2. As you may know, 11.2 is no…
Last year, we started to upgrade some Documentum Administrator from 7.2 to 7.3 and directly after, we started to see some NullPointerException on the log files. We are using DA 7.3 on some recent WebLogic Servers versions (12.1.3, 12.2.1.2). We usually deploy DA as a WAR file (so not exploded) with just the dfc.properties, keystores and logs outside of it.…
By Franck Pachot . Creating – and using – your own services has always been the recommendation. You can connect to a database without a service name, though the instance SID, but this is not what you should do. Each database registers its db_unique_name as a service, and you can use it to connect, but it is always better to…
By Franck Pachot . In the Oracle Database Cloud DBaaS you provision a multitenant database where tablespaces are encrypted. This means that when you unplug/plug the pluggable databases, you also need to export /import the encryption keys. You cannot just copy the wallet because the wallet contains all CDB keys. Usually, you can be guided by the error messages, but…
This is a small migration demo of a 11g catalog (RCAT11G) to a new 12c catalog (RCAT12c). Demo databases environments have been easily managed thanks to DBI DMK tool. oracle@vmreforadg01:/home/oracle/ [RCAT11G] sqh SQL*Plus: Release 11.2.0.4.0 oracle@vmtestoradg1:/home/oracle/ [RCAT12C] sqh SQL*Plus: Release 12.2.0.1.0 Current configuration Displaying the list of databases registered in the RCAT11g catalog. SQL> select instance_name from v$instance; INSTANCE_NAME…
By Mouhamadou Diaw Nowadays data are increasing more and more. And some challenges we can face can be how to reduce storage costs and how to improve performance. With Oracle 12c, the feature Automatic Data Optimization (ADO) can help us. In this first blog we will see how we can use ADO to compress data under predefined conditions. ADO is…
By Franck Pachot . This is a small demo I did when I’ve found a database password file (orapw) lying around in /tmp with -rw-rw-rw- permissions, to show how this is a bad idea. People think that the orapw file only contains hashes to validate a password given, and forget that it can be used to connect to a remote…
