DBA_FREE_SPACE - Misunderstanding how Oracle populates it
One of my colleagues asked why some tablespaces are missing from DBA_FREE_SPACE. You have to be sure that, below cases is not true for your tablespace, if it does not appear in DBA_FREE_SPACE: 1) The...
View ArticleRelation between Oracle Direct Path Insert, NOLOGGING, Unusable Indexes
Sometimes lots of us confused as mistakenly thinking DIRECT PATH INSERT (using APPEND hint) will not generate or generate LESS redo. In reality, it is true, but there are other conditions which must be...
View ArticleHow to become an Oracle Certified Master (OCM)
I became an Oracle 10g OCM, everybody else wanted to know how to become one. Let me show you the way to become an Oracle Certified Master (OCM). 1) You have to get OCP (Oracle Certified Professional)...
View ArticleHow to get list of hidden parameters in ORACLE?
Hidden parameters should be used only and only under Oracle Support control. Otherwise you can be left with your corrupted database. In the near future I will post real world example what it caused...
View ArticleReal world example what it can cause using hidden parameters without Oracle...
As we know, there are many undocumented initialization parameters in Oracle Database and sometimes it is called "hidden parameters". These parameters is critical tool for Oracle Support Engineers in...
View ArticleStandby database: ORA-00600: internal error code, arguments: [3020]
Today I received error in Standby database after adding new datafile into UNDO tablespace at primary site. This is Oracle SE 9.2.0.5 on Sun box which is used by Vendor Application: Media Recovery Log...
View ArticleORA-08106: cannot create journal table ... and ORA-00600
Environment: OS: Win2003 32 bit Oracle: 10.2.0.1 Problem description: My colleague told me that he can not rebuild index online. Index partition datafile was lost. Trying to rebuild index in online...
View ArticleORA-15063: ASM discovered an insufficient number of disks for diskgroup
After sudden restart of DB Server, interesting issue happened with ASM instance today. OS: Win2003 32 bit Oracle: 10.2.0.1 SQL> startup ASM instance started ... ORA-15032: not all alterations...
View ArticleA new thing I learned today: Truncating a table makes an unusable index valid
Today I was rereading 11gR2 new Features regarding unusable indexes. I met with following in that document: 11GR2 doc Unusable indexes An unusable index is ignored by the optimizer and is not...
View ArticleOracle 11g new feature in DataPump Export: Overwrite existing dump file
As you know, until 11g, normally, Data Pump Export will return an error if you specify a dump file name that already exists. Starting with 11g, the REUSE_DUMPFILES parameter allows you to override that...
View ArticleOracle 11g new feature: PRIMARY_DB_UNIQUE_NAME column in V$DATABASE
You can now find the DB_UNIQUE_NAME of the primary database from the standby database by querying the new PRIMARY_DB_UNIQUE_NAME column in the V$DATABASE view. Also, Oracle Data Guard release 11g...
View ArticleOracle 11g new feature: new data dictionary view for listing users with...
As you know, after creation of new database, there will be some DB users whose password should be changed because of security issues. Before 11g, we had to read documentation and check which users are...
View ArticleOracle 11g: Easy way getting current session's trace file name
As you know, sometimes we need to trace session, in order to troubleshoot application performance and etc. Tracing session generates server side file with name as:...
View ArticleORACLE Database Firewall
Oracle Database Firewall provides a Next Generation technology for securing and protecting data in databases. Database Firewall uses a very different approach, which offers greater levels of...
View ArticleOracle 11g: SecureFiles
Starting from Oracle 11g, there is a new feature which is called SecureFiles. Although it is very useful feature, less people is aware about it or implemented it. I don't know why ;) SecureFiles is...
View ArticleEXADATA Certified Implementation Specialist...
Today, I have passed 1Z0-536 Oracle Exadata 11g Essentials.It means, I I have one more Oracle Certification Program status – Oracle Exadata 11g Certified Implementation Specialist! My passing score...
View ArticleOracle 12 High Availability New Features Series: 1 - Partial Global/Local...
Since its first introduction in Oracle 8.0 in 1997, Oracle has enhanced the functionality of Oracle Partitioning with every release, by either adding new partitioning techniques, enhancing the...
View ArticleOracle Database 12c: What happens during CDB startup if one the PDB has a...
During Oracle Day 2014, which held in Baku/Azerbaijan, my friend Mahir Quluzade told me that, according his test if there is media problem in one of the PDB and if we want to startup CDB, CDB will not...
View ArticleNever hurry up for telling "It is a BUG in Oracle"!
Today I was upgrading(software of all of components, except DB and GI) Exadata X2 to new version. First I did standby site, so we had to simulate some tests to be sure everything is OK as expected. One...
View ArticlePatching Oracle Exadata (Quarterly Full Stack Jan 2014 - 11.2.0.3.0): 17816100
Patching Exadata is divided into 3 categories: Storage Server Patch Database Server Patch Infiniband Switches Patch I will write all the steps and explain why and how. Critical NOTE: Before starting...
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