Performance Tuning :: ORA-02017 / Integer Value Required
Nov 28, 2012
Recent events at work are forcing me to take a much closer look at hash joins in an attempt to understand them much deeper than just on the surface. But my question today is maybe simple. I have done lots of reading and can't for the life of me figure out how to get more memory to my HASH JOINS.
is there are way to get around this limit of 2GB on a box that has 64GB with some 20gb not in use?
1) my databases are all using workarea_size_policy=AUTO
2) I am not afraid to go back to =MANUAL and set my own work area sizes.
3) It seems I cannot set HASH_AREA_SIZE to more that about 2GB.
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE 11.2.0.2.0 Production
TNS for Solaris: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
18:40:31 SQL> alter session set hash_area_size = 6000000000 ;
alter session set hash_area_size = 6000000000
*
ERROR at line 1:
ORA-02017: integer value required
I know there is a limit of about 2GB on my box for HASH_AREA_SIZE and setting it to 2GB works fine. But it is still not enough.
18:50:22 SQL> alter session set hash_area_size = 2147483647;
Session altered.
Elapsed: 00:00:00.23
is there are way to get around this limit of 2GB on a box that has 64GB with some 20gb not in use? Using hash_area_size and 2GB, I get better performance than with my current PGA_AGGREGATE_TARGET doing the allocation for me.
I think I'd like to get as much as 20GB to specific sessions for hash joins but maybe I am pipe dreaming?
NAME TYPE VALUE
------------------------------------ ----------- -------------------
_pga_max_size big integer 1258280K
pga_aggregate_target big integer 6G
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Snap Id Snap Time Sessions Curs/Sess
--------- ------------------- -------- ---------
Begin Snap: 22631 22-May-13 10:00:11 976 7.9
End Snap: 22632 22-May-13 11:00:28 978 8.1
Elapsed: 60.29 (mins)
DB Time: 795.66 (mins)
[code].....
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