index of reverse key and quarrels in the CARS

Hi guys,.

I have read that reverse key indexes distribute values in an index and are particularly useful in the CARS, because if the index is on a streak, and many insertions occur, the RAC instances will access the block sheet of index on the side right, and so with the help of a key index reverse, we can stop this argument if we use a reverse key index. Fair enough, makes sense.

But, not all of these RAC instances also would be access to the same block of data in the base table when they insert? Wouldn't we have serious claim here?

Thank you

I think ask Justin to create a forum of OracleGuy777. :-)

OracleGuy777 wrote:

Not sure why you want to involve PK or PK increment as a condition, or restrict the other thing that happens in the block.

No, I was not limiting nothing happens. I said just that if nothing else happens in the block because I wanted to understand if my understanding of the data block and locking are correct if the only thing thaty now goes it is that someone is inserting a line, and the PK is a sequence that increases of 1 every time an insert that is happening.

Good. As much as I know there no functional change in a block-table perspective if the inserts imply the PK. And the fact that the PK increments of 1 is totally out of reach and out of place.

>

then the number of inserts that can happen at a given time is determined by MAXTRANS (and assume that the block has enough space for the ITL to develop). This is true for the index data block and the block of data in table, and the transactions that the insert will get an exclusive table lock on line. My understanding is correct?

Close enough. Suggest that you only consider http://dbaspot.com/forums/database-discussions/35673-initrans-maxtrans.html

I went and read that (with great difficulty, why is every post published about 10 times?!). Yes, good article, but still don't know why my understanding is close enough, and that little, I was wrong.

(Each is re-posted because the thread came from Usenet newsgroups, and entries are independent in time.) Is that although later than aggregators put them into one long page. Ideally you would just read the last entry and e able to catch up on the full thread. "These are the days.)

Perhaps a better discussion is at http://advait.wordpress.com/2008/06/16/interested-transaction-list-itl/

According to my interpretation, that the link contains a logic error (fairly common) in that it involves the ITL points to the line that is locked. This is not correct - the points of the line back to the location that contains the ITL. (In fact the line directory doesn't, the line itself.) If more than one line may be blocked by the same transaction as 'lines' in the directory headers point to the same LAUGHS.

I discovered many years ago that nothing is absolute in Oracle. When I say "this is true" or "it's like that", someone pointed out a Variant that proves me wrong. Things change version, by patch, by design, by function, by segment type, etc. So when I say "this is close", I guess that's a theory of decent work, but there may be exceptions. If you intend to learn all variants, you'll learn some time loooooong.

In older versions of Oracle, MAXTRANS was usually set quite low and the DBA would adjust that to manage the space-vs-locking problems that allude you to. In its latest versions, MAXTRANS is simply pegged to 255, especailly when you use SAMS and is officially deprecated.

The entire concept of ITL and line lock is subtly different in the index, however. Insertion of a row in a table can affect a large number of different lines through the index. How much should be locked when a split block that happens? Or when inserting in the middle of a beach? I think that Richard Foote has some info on that as well.

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