Suboptimal Query when Gather Partition Stats on Reference Partitioned Table
Last updated on MAY 12, 2017
Applies to:
Oracle Database - Enterprise Edition - Version 11.1.0.6 to 11.1.0.7 [Release 11.1]Information in this document applies to any platform.
Symptoms
Collecting stats on a partitioned table takes a long time.
Analyzing 10046 trace output, we can see for each partition there is a select similar to:
select /*+ full(t) no_parallel(t) no_parallel_index(t) dbms_stats
cursor_sharing_exact use_weak_name_resl dynamic_sampling(0) no_monitoring
*/to_char(count("C1")),to_char(substrb(dump(min("C1"),16,0,32),1,120)),
to_char(substrb(dump(max("C1"),16,0,32),1,120))
from
"SCOTT"."S" t where TBL$OR$IDX$PART$NUM("SCOTT"."S",0,4,0,"ROWID") = :objn
/* NDV,NIL,NIL*/
cursor_sharing_exact use_weak_name_resl dynamic_sampling(0) no_monitoring
*/to_char(count("C1")),to_char(substrb(dump(min("C1"),16,0,32),1,120)),
to_char(substrb(dump(max("C1"),16,0,32),1,120))
from
"SCOTT"."S" t where TBL$OR$IDX$PART$NUM("SCOTT"."S",0,4,0,"ROWID") = :objn
/* NDV,NIL,NIL*/
TBL$OR$IDX$PART$NUM is the key part to look at.
Cause
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