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ANSI flashback

I am seeing “traditional” Oracle SQL syntax being replaced by “ANSI”-style far more frequently than I used to – so I thought I’d just flag up another reminder that you shouldn’t be too surprised if you see odd little glitches showing up in ANSI style that don’t show up when you translate to traditional; so if your SQL throws an unexpected error (and if it’s only a minor effort to modify the code for testing purposes) it might be a good idea to see if the problem goes away when you switch styles. Today’s little glitch is one that showed up on the Oracle-l listserver 7 years ago running 11.2.0.3 but the anomaly still exists in 19c.

Video : Decoupling to Improve Performance

In today’s video we demonstrate how to cheat your way to looking like you’ve improved performance using decoupling.

This was based on the following article.

This came up in conversation a few days ago, so I thought it was worth resurrecting this demo. It doesn’t really matter what tech stack you use, the idea is still the same.

Oracle and postgres disk IO performance

This post is about one of the fundamentally important properties of a database: how IO is done. The test case I studied is doing a simple full table scan of a single large table. In both Oracle and postgres the table doesn’t have any indexes or constraints, which is not a realistic example, but this doesn’t change the principal topic of the study: doing a table scan.

I used a publicly available dataset from the US bureau of transportation statistics called FAF4.5.1_database.zip
The zipped file is 347MB, unzipped size 1.7GB.

WITH Subquery

Here’s another anomaly that appears when you mix and match Oracle features. In this case it’s “With” subqueries (common table expressions / CTEs) and Active Dataguard (ADG) Standby databases. The problem appeared on the Oracle-l listserver and luckily for the OP another member of the list had seen it before and could point to a relevant MOS document id which explained the issue and supplied a workaround.

The OP had their standby database opened read-only for reporting and found the following oddity in the extended SQL trace file for one of their reports:

Migrating Oracle Exadata Workloads to Azure

I know, I know-  there’s a number of you out there thinking-

I’m being brought in on more and more of these projects due to a recent change for some Exadata backup components many companies kept onsite, (parts that wear out more often, like PDUs and cell disks) which are no longer an option and that moving to Azure is a viable option for these workloads if you know what to identify and address before the move to the cloud.

Philosophy 23

It’s a long time since I wrote a note with the “philosophy” theme, but a recent complaint about Oracle prompted me to suggest the following thought:

“If you write SQL that is technically incorrect it’s not Oracle’s fault if sometimes the SQL completes without an error.”

Consider the following fragment of code:

Announcing SLOB 2.5.2.3

SLOB 2.5.2.3 is a bug-fix release available via the SLOB Resources Page. The bug fixes in this release have to do with refinements to the undocumented Obfuscated Column feature which first appeared in SLOB 2.5.2.

I’d like to give special thanks for some very skilled SLOB experts at Netapp for their feedback on the Obfuscated Column feature. Your testing helped find bugs and resulted in improved functionality.

Thank you Rodrigo Nascimento, Joe Carter and Scott Lane!

 

 

What’s new with Oracle database 12.2.0.1.191015 versus 12.2.0.1.200114

For the difference between Oracle database versions 12.2.0.1.191015 and 12.2.0.1.200114 this too follows the line of a low amount of differences.

There have been two spare parameters that have been changed to named undocumented parameters, and no data dictionary changes.

parameters unique in version 12.2.0.1.191015 versus 12.2.0.1.200114

NAME
--------------------------------------------------
_fifth_spare_parameter
_one-hundred-and-forty-eighth_spare_parameter

parameters unique in version 12.2.0.1.200114 versus 12.2.0.1.191015

NAME
--------------------------------------------------
_bug29825525_bct_public_dba_buffer_dynresize_delay
_enable_ptime_update_for_sys

On the C function side, there have been a group of AWR functions that have been removed and a group of SGA management functions, among other functions. There functions that have been added are random and diverse.

Index Engineering

This is a case study based on a question that appeared on the Oracle Developer Community forum a few days ago.

What I’m aiming to present in this note is the pattern of thinking that you should adopt in cases like this. The final suggestion in this note isn’t necessarily the best answer to the question posed (at the time of writing the OP hadn’t supplied enough information to allow anyone to come up with a best solution), but the point of the exercise is to talk about the journey and (perhaps) remind you of some of the extreme engineering you can do with indexes.

The (massaged) problem statement is as follows:

I have a table of more than 200 million rows that is used for inserts, updates and queries. I have a query on this table and want to know what index I could create to speed up the query.

Video : Schema Only Accounts in Oracle Database 18c Onward

Today’s video is a demonstration of schema only accounts, introduced in Oracle Database 18c.

This is based on the following articles.