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Continue reading →: Oracle ACE Award
I have just learned that I have been nominated and accepted as an Oracle ACE. I would like to thank Jonathan Lewis for the nomination and Oracle Corp. for the recognition. It’s a tremendous honour for me to receive this award. I just hope I can live up to it…
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Continue reading →: Goldengate Data Manipulation – When Inserts & Updates differ
One very useful aspect of Golden Gate is to allow the manipulation of data between the source and the destinations. One recent problem that I encountered was to alter the data differently for inserts than for updates. This was caused by the receiving system needing to have some default data…
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Continue reading →: UKOUG Tech15 Call for Papers
The #ukoug_tech15 call for papers has gone out, and will be open until midnight on 10th May 2015 Last year was a fabulous event in Liverpool and we hope and expect it to be even better in Birmingham this year.
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Continue reading →: Developers
Just a small Sunday night anecdote with a wider point. I, or maybe a colleague, recently received an update statement from a developer. Now, this developer is long of tooth and is well versed in the ways of Oracle data manipulation. The aforementioned update statement contained an interesting hint. BYPASS_UJVC.…
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Continue reading →: Auditing Read-Only Standbys
For a more up-to-date post about auditing and security, read about Unified Auditing. On a read-only standby, when in Pure mode, the audit trail is written to disk (as it cannot write to a read-only database!) in a binary format which can be shipped across to the Primary occasionally and…
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Continue reading →: Sequences – where did the view go?
I was pottering around with the sequence cache recently, investigating a few things like exactly when it refreshes (such as if it is flushed or aged from the shared pool – pin it!) and I was monitoring the next value using V$_SEQUENCE, like I have been since, erm, Oracle 8i…
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Continue reading →: Sequences – a quick guide and an unexpected quirk
Sequences on Oracle databases are simple, but there are some basic truths about sequences which need to be understood if you are going to use them, especially on RAC: Sequences will have “holes” in them, even if you specify NOCACHE (e.g. if you rollback your transaction). Don’t specify NOCACHE. It…
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Continue reading →: Goldengate: Problems with character sets
One complication that you may face with replicating data using Goldengate (or other tools) is when your source character set is different to your destination character set. This is particularly true when the source character set is UTF-8 and the destination is not. If the application does not sanitise (or…
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Continue reading →: Checking the alert log – the easy way
Do you check the alert log of your databases every day? In the morning when you get in? But what about the alerts which happen during the day? How do you spot them – especially if you don’t have Grid Control or Cloud Control configured. Even if you do have a…
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Continue reading →: UKOUG Tech 14
On Sunday I will be heading North from London to Liverpool for 4 days, to attend another UK Oracle User Group conference – #UKOUG_Tech14 I’m sure it will be as wonderful and informative a 4 days as you can get in the Oracle technical area. The hard part of attending…
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Continue reading →: Adding a DEFAULT column in 12C
I was at a talk recently, and there was an update by Jason Arneil about adding columns to tables with DEFAULT values in Oracle 12C. The NOT NULL restriction has been lifted and now Oracle cleverly intercepts the null value and replaces it with the DEFAULT meta-data without storing it in…
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Continue reading →: Club Oracle in London – 12th November 2014
#cluboracle free event in November 2014
Neil Chandler's DB Blog 