Stephane,
Wouldn't it be considerably safer to delete statistics and
recompute with out histograms?
Jared
"Stephane
Faroult" To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
<sfaroult@oriol cc:
ecorp.com> Subject: Has anybody encountered
problems with HISTGRM$ ?
Sent by:
[EMAIL PROTECTED]
m
12/17/01 03:05
AM
Please respond
to ORACLE-L
The DBA of one of my customers tried to run one week ago dbms_stats() to
analyse all indexed columns. The result was that all queries ended with
ORA-00600. As trace files were indicating queries on HISTGRM$ I immediately
directed him to the CBO (he had not instantly linked the cause to the
effect). His workaround was to switch to RBO, with of course side-effects.
When I came to the site, I reached for my axe and cleaned up everything
using questionable means, especially against a production database (junior
DBAs, please skip the next paragraph. Socrates was sentenced to death for
corrupting the youth and I'd rather avoid the same fate).
I first looped on hist_head$ to remove all related rows in histgrm$.
Before that any query on DBA_COL_HISTOGRAMS ended in ORA-600. After the
loop, to my surprise there still were rows in histgrm$. I deleted them, and
still had ORA-600 when querying DBA_COL_HISTOGRAMS. They did not
disappeared before I truncated cluster C_OBJ#_INTCOL# (or something like
this - the cluster which holds HISTGRM$).
There is no obvious sign of data block corruption; it looks more like a
logical corruption. I run the same dbms_stats() command on a copy of the
database without any problem, and I don't know where the blame should go.
Has anybody encountered anything even remotely similar? In that case, it
is Oracle 8.1.7.2 on Tru64.
TIA,
Stephane Faroult
Oriole Corporation
Performance Tools & Free Scripts
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