Infrastructure at your Service
Below, I will try to explain, a particular case for the general error : ORA-01555 snapshot too old error.. Normally, when we have this error, we are trying to adapt the retention parameters or to tune our queries. SQL> show parameter undo; NAME TYPE VALUE ———————————— ———– —————————— temp_undo_enabled boolean FALSE undo_management string AUTO undo_retention integer 3600 –extended from 900, undo_tablespace string UNDOTBS1 But, are some scenarios where the above rule is not working . We…
Oracle Clusterware 18c builds on this innovative technology by further enhancing support for larger multi-cluster environments and improving the overall ease of use. Oracle Clusterware is leveraged in the cloud in order to provide enterprise-class resiliency where required and dynamic as well as online allocation of compute resources where needed, when needed. Oracle Grid Infrastructure provides the necessary components to manage high availability (HA) for any business critical application. HA in consolidated environments is no…
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…
Let’s do some tests with the Oracle 18c new feature in creating PDB clone with DBCA. Unfortunately, this feature does not work when you have TDE enabled. Just to remember, with Oracle 12.2 we had the possibility to create PDBs with dbca just from PDBseed to from unplugged PDBs: Now in version 18c we can create PDBs from existing PDBs as follows (for this test TDE is disabled): You can choose the Pluggable Database you want…
To do some application and performances tests, I had to copy a database from a third party Linux server to an ODA X7-2M. Looks pretty simple on the paper, but 2 small challenges came into the game. The first was that of course the source database was in Non-OMF while ODA works fully in OMF. The second was that the source database is running 11.2.0.3 which is not supported and cannot be installed on the…
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. [email protected]:/home/oracle/ [RCAT11G] sqh SQL*Plus: Release 11.2.0.4.0 [email protected]:/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 —————- RCAT11G SQL> select * from rcat.rc_database; DB_KEY DBINC_KEY DBID NAME RESETLOGS_CHANGE# RESETLOGS ———-…
Last day I was configuring grid infrastructure 11.2.0.3 for a standlone server. After the installation, I decided to apply the Patch Set Update 11.2.0.3.7 (Includes Database PSU 11.2.0.3.7) – 16742216 In the documentation it is marked You must use the OPatch utility version 11.2.0.3.4 or later to apply this patch. Verifying my opatch version, I see that I have to update it [[email protected] ]# ./OPatch/opatch version Invoking OPatch 11.2.0.1.7 OPatch Version: 11.2.0.1.7 So I download…
Available methods to enable 10046 trace are described in My Oracle Support Note 376442.1. You can enable 10046-tracing – on session level (alter session) – for other sessions (e.g. with oradebug, the package DBMS_MONITOR or DBMS_SYSTEM) What is not covered with the methods above is the possibility to trace a specific SQL-statement, which runs “somewhen” in the future on the database. E.g. a SQL, which runs during a next batch job. With the introduction of…
We have Upgrade our Environment Oracle DBA Essentials Workshop of release 11.2.0.3 to 11.2.0.4. From now on, you can operates the various subjects on the new release. In this article, I present you the procedure to be followed for the upgrade of your database: Update DMK to the version 14-10 Upgrade database Install Oracle Patchset 11.2.0.4 and PSU Update DMK 14-10 The first step it’s update Data Management Kit, included dmk_sql. We need to Download,…
We discovered a strange behavior in the Alert Log when the Fast Recovery Area (FRA) is full and the database wants to write something inside it (for example an archivelog). This case concern Oracle 11.2.0.3 databases and higher. Here is a demo with a 12c database (12.1.0.2) : First, to reproduce the behavior, I set a very small size to the FRA : SQL> alter system set db_recovery_file_dest_size = 1M; System altered. SQL> As you can see, the…
