Hi all,
We had gotten some extra memory for our production server and I was trying
to increase our buffer cache again (I was leery of doing it all at once so I
just doubled it the first time). I got a
ORA-27123: unable to attach to shared memory segment
with my first try (it worked after I reduced the buffer cache a bit) and I'm
trying to figure out why.
Total memory on the machine is 4Gig.
shmmax=2048000000 (2000M)
4K Block size
I was able to start the database with a db_block_buffers of 350000 but not
of 400000.
Current SGA:
NAME VALUE
-------------------- ----------
Fixed Size 47296
Variable Size 248659968
Database Buffers 1433600000
Redo Buffers 1040384
This gives a total of 1605M which should leave 295M still available. An
extra 50000 blocks is only 195M. Is there something other than the total in
v$sga that counts towards the shmmax? I can't find anything in my Oracle8 &
Unix Performance Tuning book.
Thanks for any guidance!
Jay Miller
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Author: Miller, Jay
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