session pga memory value is much higher than Sort_Area_Size

2001-05-29 Thread Srikannan Gopalsamy 

We've set sort_area_size to 8M, but the session pga memory usage shows much
higher than 8M, in fact its about 176M. 

The heap value for the shadow process also confirms the size of the PGA
area. 
01A4 180496K read/write/exec [ heap ]

I thought that the PGA size should not go beyond sort_area_size. 

Are we missing anything here? 

Thank for your help.

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Author: Srikannan Gopalsamy
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Sessions are waiting on buffer busy wait with P3 value 130 in v$s

2001-05-24 Thread Srikannan Gopalsamy 

We've lot buffer busy waits in data block with P3 value 130 in V$session. 

I've read about this in few notes, but still I do not understand few things.


P3=130 means: 
- 
Block is being read by another session and no other 
suitable block image was found, so we wait until the read 
is completed. This may also occur after a buffer cache 
assumed deadlock. The kernel can't get a buffer in a 
certain amount of time and assumes a deadlock. 
Therefore it will read the CR version of the block. 

Does it mean that the block is being held in an incompatible mode by the
first session or set of sessions reading it in shared mode, and current
session is trying to lock it exclusively for a DML and waiting for the same.


What are steps we can take to avoid this types of buffer busy waits? 

Thanks for your help. 
Sri
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Author: Srikannan Gopalsamy
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