RE: Number of Transaction Slots

Thanks Robert, and thanks once again, Gopal.

Now, metalink also has a formula for finding the number of transaction slots (DOC ID: 177926.999), and Steve Adams too explains precisely how he arrived at that number of 21 slots for a 2K block size at http://www.ixora.com.au/q+a/0008/29204045.htm without dumping the header block, from v$TYPE_SIZE.

But then the metalink has one formula, if the rollback segment has a fixed number of extents, and another if it has unlimited number of extents. Steve Adams also does refer to the extent control headers, but I think he's done either of the one assumptions.

Can someone take a look at both the articles, and confirm if its' really so.

Thanks a Ton
Raj

                                                                                                    
                                                                                                    
                                                                                                    






                                                                                                                     
                    "Freeman,                                                                                        
                    Robert "              To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>        
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                    March 07, 2002                                                                                   
                    03:23 PM                                                                                         
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To give credit where credit is due, this came from my friend K Gopalakrishnan...

The transaction slots are visible as KTUXESLT in X$KTUXE. We can get the number of transaction slots in the rollback segments by

select count(*) ktuxeslt from X$ktuxe group by ktuxeusn;

The # of transaction slots are determined by the database block size.

RF

Robert G. Freeman - Oracle8i OCP
Oracle DBA Technical Lead
CSX Midtier Database Administration

The Cigarette Smoking Man: Anyone who can appease a man's conscience can take his freedom away from him.

-----Original Message-----
Sent: Thursday, March 07, 2002 3:04 PM
To: Multiple recipients of list ORACLE-L

I believe someone else had asked this question before, but I did not see a reply. Does anyone know the number of transaction slots in the rollback segment header for block sizes of 4k, 8k, et all?

>From what I have read, for a block size of 2K, its 21 transaction slots.
(Steve Adams at www.ixora.com.au)
For a block size of 8K, its 98 (Jonathan Lewis on Metalink - For 8.1.6)

As per Metalink:

2K - 31
4K - 67
8K - 140

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