Category: Oracle
September 5

XMLDB Performance: Binary XML Storage Models

This post will show you some of the first numbers I collected regarding “Loading XML data”, while making use of different XMLType “physical storage containers”.

I also have done some initial testing with Object Relational XMLType storage, but because this method of storage has many options and extra features, I won’t describe them yet here. This topic is interesting enough to earn its on post.

If you need some background on Oracle XMLType Storage option than have a read through the “Binary-, CLOB, Object Relational Storage” Category option in the menu, the Oracle XMLDB Developers Manual or a short intro via Oracle 11g – XMLType Storage Options.

After having created an environment as described in “XMLDB Performance: Environment, Set-up, Procedure“, the following results were gathered by me while keeping values constant, for example the values for “connection.xml“, as described in the “XMLDB Performance: Environment, Set-up, Procedure” . Only the WIKI_STAGE create statements are different.

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September 5

XMLDB Performance: Environment, Set-up, Procedure

There has some time past since my last update on my XMLDB Performance, tuning, adventure. As you maybe have read, I had my problems to set-up a decent test environment and loading XML data. I am testing with an Mediawiki XML dumpfile. If there is a problem or a side effect to notice than I have a big chance that it will show up if not only by the size of this Mediawiki XML dumpfile. The Mediawiki XML dumpfile contains, when I downloaded it, almost 8 million records and has a file size on Windows NT NFS of 17,4 Gigabyte.

Loading this data via the procedures described in my posts, “HOWTO: Load Really Big XML Files” and “Setting Up an XMLDB Performance “Baseline” Environment (Part 02)” dealt with some of the issues I encountered to realize controllable testing set-up. Loading this amount of XML data will take some time.

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August 29

Oracle XMLDB Related “Events”

Undocumented stuff is always very interesting, although there is of course a reason why it is undocumented… Event settings are more or less in this category. They are often used by Oracle Support in their quest to do a good job solving our problems.

Sometimes events disable or enable features. Sometimes they trace internal processes. The later can be very helpful like setting the infamous “10046” event. I noticed some event settings that can be helpful while using XMLDB or the Protocol Server.

Here a small overview of some events that are in the manuals or mentioned during discussions on the OTN XMLDB Forum… Be careful while “playing” with these events. Some are mentioned in the XMLDB Developers Guide and not an big issue, others can cause very strange results or abnormal behavior.

So be advised…

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