RDBMS Server

Oracle RDBMS Server Articles

Database 20c docs

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Now available!
https://docs.oracle.com/en/database/oracle/oracle-database/20/books.html

Going through the New Features guide, there is a shed load of wonderful enhancements. Then you look at the Licensing guide, and most of them require Exadata or Oracle Cloud or both.

Recover a database using RMAN but failing to open redo

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When using RMAN to restore and recover the database, it seems to work OK - no obvious errors during the restore / recovery, as far as I can see. The issue seems to be when I try to 'alter database open resetlogs'... after this the database shuts down. At this point, I don't really care about losing some of our data, this is just a test system, my main concern is how to get the database working again.

Oracle version 12.1.0.

1. I startup with nomount.

RMAN> startup nomount;

DISKSPACE MONITORING

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DISKSPACE MONITORING
Written JP Vijaykumar
Date Jan 4th 2020
Modified Jan 5th 2020
**************************************************************
This article/script is provided for educational purpose ONLY.
The readers are advised to make necessary changes to the script as may be required for their use in their respective environments.
Pls test these scripts thoroughly in a lower environment, ONLY if you are satisfied with the tests' results, then ONLY use in any

How to move a table from one schema to another

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Many times I've seen the question on forums "How can I move a table from one schema to another?" and the answer is always that you can't. You have to copy it. Or export/import it. Well, here's a way. It assumes that you are on release 12.x and have the partitioning option.

19c Standard Edition permits 3 PDBs per CDB

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A very nice licensing change in 19c: you can now have up to three PDBs in a Standard Edition Multitenant database.

Compression test, 12cR2

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Just how effective is Hybrid Columnar Compression? This test shows that HCC is impressive, but that thought needs to be put into choice of compression algorithm.

12cR2 lots of new instance parameters

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Comparing database 12cR1 release 12.1.0.2 to 12cR2 release 12.2.0.0.3, I see these new parameters:

12cR2 new feature: online table move

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Move a table without locks and without breaking indexes. That's pretty cool.

How indexes can degrade performance

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Indexes may improve the performance of SELECT statements, but what about DML? This simple demo shows how bad they can be.

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