Mutexes And Changes in Library Cache - HrOUG

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DbProf. com Shared Pool Heaps www.dbprof.com - © 2012 Jože Senegačnik Oracle ACE Director 8
DbProf. com Multiple Child Cursors • Can be created for a number of reasons including differences in: – System / Session parameters – Object translation – Bind variables – NLS parameters – CBO environment – Tracing – ... • Check V$SQL_SHARED_CURSOR – Heap 0 must still exist – Reports only for child numbers > 0 SELECT TO_CHAR (bitvector,'XXXXXXXXXXXXXXXX'), COUNT(*) FROM x$kkscs GROUP BY TO_CHAR (bitvector,'XXXXXXXXXXXXXXXX') ORDER BY 1; www.dbprof.com - © 2012 Jože Senegačnik Oracle ACE Director 9
Page 1 and 2: DbProf. com Mutexes And Changes in
Page 3 and 4: Latches, Hash Buckets & Data Blocks
Page 5 and 6: DbProf. com Structure of the Child
Page 7: DbProf. com Memory Allocations •
Page 11 and 12: Efficiency of setting SESSION_CACHE
Page 13 and 14: DbProf. com Parsing Latches (Prior
Page 15 and 16: DbProf. com Mutexes www.dbprof.com
Page 17 and 18: DbProf. com Mutex Holding Modes •
Page 19 and 20: DbProf. com Mutex Benefits (2) •
Page 21 and 22: DbProf. com Mutex Creation and Usag
Page 23 and 24: DbProf. com Library Cache Mutexes M
Page 25 and 26: DbProf. com Mutex Locations select
Page 27 and 28: DbProf. com The Mystery of Numbers
Page 29 and 30: DbProf. com Mutex Usage - “Cursor
Page 31 and 32: DbProf. com V$MUTEX_SLEEP SQL> sele
Page 33 and 34: DbProf. com Blocker Session Id •
Page 35 and 36: DbProf. com High Version Count and
Page 37 and 38: DbProf. com Cardinality Feedback Tu
Page 39: DbProf. com Thank you for your inte

Mutexes And Changes in Library Cache - HrOUG

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