STATSPACK % blocks modified by read

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• Interpretation of STATSPACK

  Hi DBAs,
  
  
  I need help to understand/interpret the statpacks load profile. As a sample below, what is this number indicates to redo size per second. What is a size of Redo generated in bytes and how a relationship between per second / transactions. According to the following example, this means that (20 981 / 8614 = 2.4) p.6
  This recovery has generated. If this section is any kind of average this average is based on that. I'm a bit confused to interpret the entire section. Please help on this.
  
  Load profile-/ s - per Transaction
  Restore size :---20 981, 54-8, 614.56
  Logical reads:--14, 411.11 - 5, 916.88
  Block changes :--87.19---35,80
  Physical reads: - 96.41 - 39.58
  Physical writings: - 5.15 - 2.12
  Calls for user :---239.66---98.40
  Analysis: - 54.53 - 22.39
  Strong analysis :---0.92---0, 38
  Kinds: - 16.94 - 6.96
  Opening of session :---0.04---0, 02
  Running :---70.14---28.80
  Transactions:---2.44
  
  Blocks modified by read %: 0.61 - percent recursive call: 54,57
  Rollback transaction %: 42, 21 - stored by genre: 60,24
  
  
  Thank you and best regards,
  -Samar-
  
  Edited by: Nome02 may 3, 2009 21:45

  Series of analysis of Statspack, Jonathan is probably the best reference you can find anywhere on the web

  http://jonathanlewis.WordPress.com/2006/11/29/analysing-STATSPACK-pt1/

  I suggest you go throughout the entire series.

• Run parse %

  Hi all
  
  while I'm checking AWR report I'm Execute % Analysis:-0.79
  
  When I check the cursor_sharing parameter set to EXACT
  
  
  In my opinion will I turn it on to force it or not

  Vikas Kohli wrote:
  Load profile

  Per second per Transaction
  Size: 175,185.67 252,714.86
  Logical reads: 17,255.59 11 961,83
  Block changes: 183,62 264.89
  Physical reads: 333,09 480.50
  Physical writings: 18,18 26.22
  The user calls: 4.53 6.54
  Analysis: 21,03 30,34
  Hard analysis: 0.01 0.01
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  Logons: 0.11 0.07
  Runs: 20,87 30.10
  Operations: 0.69

  Blocks modified by read %: 1.54% recursive call: 92,84
  Rollback transaction %: 2,30 rows by genre: #.

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• Cancel pending

  Hello
  
  
  Executed developer a query that creates a table of joining three tables, it took a long time to create a table then we (DBA) killed the sesison developer forms from there is huge I/O consumption. create table has been run in niologing mode, I've posted a few values of AWR report and the wait event was 'wait for a check Cancel.
  
  Report from the WORKING REPOSITORY for
  
  DB name DB Id Instance Inst Num release RAC host
  ------------ ----------- ------------ -------- ----------- --- ------------
  ODSPROD 1894138111 ODSPROD 1 10.2.0.1.0 NO XXXXXX
  
  Snap Id Snap time Sessions Curs/Sess
  --------- ------------------- -------- ---------
  BEGIN Snap: 20970 25 March 09 11:30:51 173 4.2
  End Snap: 20974 25 March 09 15:30:10 151 3.9
  Elapsed time: 239.31 (min.)
  DB time: 13,431.47 (min.)
  
  Cache sizes
  ~ ~ ~ Begin End
  ---------- ----------
  Buffer cache: size 35 776 M 35 776 M Std block: 8K
  Shared pool size: 2 048 M 2 048 M Log Buffer: 8 448 K
  
  Load profile
  ~ ~ ~ Per second per Transaction
  --------------- ---------------
  Size: 1,826,558.25 1,644,434.96
  Logical reads: 48,734.09 54 131,46
  Block changes: 14,404.01 15 999,27
  Physical reads: 9 496,99 8,550.06
  Physical writings: 988.19 1 097,63
  The user calls: 163,90 147.56
  Analysis: 45.26 50,27
  Hard analysis: 0.23 0.21
  Kinds: 5.36 4.83
  Logons: 0.39 0.35
  Runs: 95,54 8602
  Operations: 1.11
  
  Blocks modified by read %: 29.56% recursive call: 76,67
  Rollback transaction %: 5.57 rows by genre: #.
  
  Instance efficiency percentage (target 100%)
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  % Buffer Nowait: 98.77 redo NoWait %: 99.89
  Buffer % success: 93,44% sort in memory: 100.00
  Library success %: 99,76% soft Parse: 99.54
  Run parse %: 47.38 latch hit %: 99.50
  Analyze the CPU to analyze Elapsd %: 27.63% Non-Parse CPU: 99.91
  
  Shared pool statistics Begin End
  ------ ------
  % Use of memory: 94,69 94.46
  Executions > 1% SQL: 94.00 95.82
  % Memory for SQL w/exec > 1: 93,19 96,30
  
  Top 5 timed events Avg % Total
  ~ ~ ~ waiting for call
  Event waits time (s) (ms) time wait class
  ------------------------------ ------------ ----------- ------ ------ ----------
  wait for recording to cancel 6 886 655 475 370 69 59.0 others
  switch log file (checkpoint in 123 588 118 643 960 14.7 sh
  DB file sequential read 8 980 853 67 170 7 8.3 user IO
  Time CPU 6.3 50 426
  direct path read 1 440 127 28 079 19 3.5 user IO
  -------------------------------------------------------------
  
  Both the statistical model DB/Inst: ODSPROD/ODSPROD Snaps: 20970-20974
  -> Total time in the user-calls database (DB time): s 805888.3
  -> Statistics, including the background measure word process 'melts '.
  time and therefore do not contribute to the statistics of time DB
  -> Ordered as a percentage or DB time desc, name of statistic
  
  Statistics time (s) % of time of the DB name
  ------------------------------------------ ------------------ ------------
  Execute SQL time elapsed 19.7 158 860,3
  DB CPU 50,425.9 6.3
  elapsed time sequence load 8,400.3 1.0
  elapsed time of connection management call 6,043.1.7
  analysis time elapsed 3,261.5.4
  the elapsed time analysis hard 3,198.2.4
  hard analysis (sharing criteria) of time 1,649.6.2
  PL/SQL execution elapsed 408.7.1
  could not parse time elapsed 292.2.0
  PL/SQL compilation elapsed 203,5.0
  hard analysis (bind incompatibility) of time 0,6.0
  repeated link 0,3.0 out of time
  DB time 805,888.3 N/A
  context of time 68,713.0 N/A
  background cpu time 6,727.7 N/A
  -------------------------------------------------------------
  
  
  I just want to know how we can capture this wait event Cancel any how the session is killed still waiting for cancellation is active what may be the cause.
  
  Sorry for the presentation of the awr report.
  
  Thank you
  
  Jafar

  Jerome wrote:

  
  Executed developer a query that creates a table of joining three tables, it took a long time to create a table then we (DBA) killed the sesison developer forms from there is huge I/O consumption. create table has been run in niologing mode, I've posted a few values of AWR report and the wait event was 'wait for a check Cancel.

  I just want to know how we can capture this wait event Cancel any how the session is killed still waiting for cancellation is active what may be the cause.

  Jafar,

  the event of waiting 'wait for a record Cancel' means possibly parallel rollback performed by SMON and slaves in parallel. For example see MetaLink Note 464246.1 (DUE TO PARALLEL TRANSACTION RECOVERY HANG DATABASE)

  What intrigues me is that a CREATE TABLE does not cancel, and what assistance the NOLOGGING option (if not replaced by some FORCE LOGGING tablespace or database level) minimizes the REDO generation.

  If a CREATE TABLE does not CANCEL since it does not apply changes to existing blocks but simply allocate new blocks which cannot be read by any other session as long as the process is not complete and if who gets killed shouldn't cause any excessive load caused by the restoration activities, but your system activity suggests otherwise. There seems to be a large transaction rollback occurring which could also explain the strong generation of REDO (back generates REDO).

  It would be more logical if the killed was a such a great INSERT without mode APPEND or a vast operation to UPDATE or REMOVE.

  Kind regards
  Randolf

  Oracle related blog stuff:
  http://Oracle-Randolf.blogspot.com/

  SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
  http://www.sqltools-plusplus.org:7676 /.
  http://sourceforge.NET/projects/SQLT-pp/

• reading non-blocking

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