 | | | High mbrc in aux_stats$ | High mbrc in aux_stats$ 2006-03-10 - By Allen, Brandon
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Anybody seen this before?
Oracle 9.2.0.5 on AIX 5.2:
SQL> show parameter db_file_multiblock_read_count
NAME TYPE VALUE
-- ---- ---- ---- ---- ---- ---- --- -- ---- --- -- --
db_file_multiblock_read_count integer 16
execute dbms_stats.gather_system_stats('START');
. . . run batch jobs for 8 minutes . . .
execute dbms_stats.gather_system_stats('STOP');
SQL> select * from sys.aux_stats$;
SNAME PNAME PVAL1 PVAL2
-- ---- ---- ---- ---- ---- -- -- ---- ---- ---- ---- ---- -- -- ---- -- -- ---
-- ---- --
SYSSTATS_INFO STATUS
COMPLETED
SYSSTATS_INFO DSTART 03-10
-2006 14:22
SYSSTATS_INFO DSTOP 03-10
-2006 14:30
SYSSTATS_INFO FLAGS 1
SYSSTATS_MAIN SREADTIM 3.864
SYSSTATS_MAIN MREADTIM 10.811
SYSSTATS_MAIN CPUSPEED 546
SYSSTATS_MAIN MBRC 97 <---
-???
SYSSTATS_MAIN MAXTHR 2957312
SYSSTATS_MAIN SLAVETHR -1
Notice the MBRC figure of 97 even though I have db_file_multiblock_read_count
=16. I searched Metalink for bugs and known issues but no luck. I guess the
next step is to peform a 10046 trace and check the p3 value for all the 'db
file scattered reads', but I figured I'd check to see if any of you have
already seen this before I go to that trouble.
Thanks,
Brandon
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