can insert bulk data two operations at the same time?

I think they should be in a position, as long as they do not use the parts that overlap.

OracleGuy777 wrote:
Sorry guys, I may be

am not being clear.
>

If T1 inserts in a data block and T2 inserts into a data block, then surely it must be some sort of lock/lock for something. I mean, otherwise they might both insert the line in the same position in the data block. If something should prevent that!

You are absolutely right. There is one kind of locking AND locking AND another (mutex) passed to prevent this exact question.

Unfortunately, Oracle acknowledges there is a problem and that the expectations of these things may cause performance problems. This is unfortunate because they tinker with it and the answer changes slightly with the version.

The choice of the lock and latch and (for newer versions, mutex) seems to be based a little on the length and complexity of the "exclusivity" serialization must be. A simple "I want it so I can return this little" will be a latch or mutex. More complex "I want it but others can watch it while I use it" will use the locks, which involve much more complex structures and the ability to queue.

There are a lot of documents, analysis, speculation, myths and so on around it. If you want to continue past 'there are mechanisms' I would recommend first to decide on the version in order to have a target to reflect and then watch whatever it is written by Tom Kyte, Jonathan Lewis, and Tanel Poder contains the word 'lock', 'lock' or 'mutex '. Studying it could take a few months of dozens.

But it's one worth studying as it heads toward some of the main areas related to performance. And it's interesting because it's really a "never-ending story" as new and innovative handling restraint means are found or news and more larger sizes require different tactics.

Tags: Database

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