waiting for buffer busy

Hello

I'm huge buffer expects busy events on my database and its increase

This is the result of query on my database (9.2.0.8.0)

SQL > select event, total_waits from v$ system_event where a test of ("free buffer waits", "buffer expects busy")
2;

TOTAL_WAITS EVENT
---------------------------------------------------------------- -----------
buffer without waiting for 118
buffer busy waits 12827

Also my "space segment management' is on 'auto' on tablespaces

Please someone let me know even if the 'segment of space management' is on 'auto', why expect busy buffer is so huge

And how to reduce this event

Concerning

Hello

Here's how to find the cause of a busy wait buffer:

http://www.DBA-Oracle.com/art_builder_bbw.htm

I hope this helps...

Donald K. Burleson
Oracle Press author
Author of "Oracle Tuning: the definitive reference".
http://www.rampant-books.com/t_oracle_tuning_book.htm
"Time flies like an arrow; Flies to fruit like a banana.

Tags: Database

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buffer busy elapse cnanging lob storage for oracle SECUREFICHIERS

Hello world

I need help to solve a problem with buffer busy waits in a lob using SECUREFICHIERS for storage segment.

While loading the application inserts a record into a table with the lob segment and update the record after the filling of the lob data. The size of the block on the table space holding the lob is 8 KB and the segment on the lob segment size is limited to 8 KB. The average size of the recording of the lob is 6 KB and the minimum size is 4.03 KB. The problem only occurs when the execution of a work with a large number of relatively small inserts (4.03 Kb) in the lob column. The definition of the table allow online storage and the ptcfree set to 10%. The same jobs runs smoothly when you use storage basicfiles for the lob column.

According to [oracle whitepaper | http://www.oracle.com/technetwork/database/options/compression/overview/securefiles-131281.pdf] SECUREFICHIERS have a number of performance improvements. I was particularly interested test gather Write Cache our app do a lot of relatively small inserts in a lob segment.

Here is a fragment of the AWR report. It looks like all busy expectations buffer belong to a class of free list. The lob segment is located in a tablespace SAMS and I can't raise to freelists.

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning option
Host Name        Platform                         CPUs Cores Sockets Memory(GB)
---------------- -------------------------------- ---- ----- ------- ----------
DB5              Microsoft Windows x86 64-bit        8     2              31.99

              Snap Id      Snap Time      Sessions Curs/Sess
            --------- ------------------- -------- ---------
Begin Snap:      1259 01-Apr-11 14:40:45       135       5.5
  End Snap:      1260 01-Apr-11 15:08:59       155      12.0
   Elapsed:               28.25 (mins)
   DB Time:              281.55 (mins)

Cache Sizes                       Begin        End
~~~~~~~~~~~                  ---------- ----------
               Buffer Cache:     2,496M     2,832M  Std Block Size:         8K
           Shared Pool Size:     1,488M     1,488M      Log Buffer:    11,888K

Load Profile              Per Second    Per Transaction   Per Exec   Per Call
~~~~~~~~~~~~         ---------------    --------------- ---------- ----------
      DB Time(s):               10.0                0.1       0.01       0.00
       DB CPU(s):                2.8                0.0       0.00       0.00
       Redo size:        1,429,862.3            9,390.5
   Logical reads:          472,459.0            3,102.8
   Block changes:            9,849.7               64.7
  Physical reads:               61.1                0.4
 Physical writes:               98.6                0.7
      User calls:            2,718.8               17.9
          Parses:              669.8                4.4
     Hard parses:                2.2                0.0
W/A MB processed:                1.1                0.0
          Logons:                0.1                0.0
        Executes:            1,461.0                9.6
       Rollbacks:                0.0                0.0
    Transactions:              152.3

Top 5 Timed Foreground Events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                           Avg
                                                          wait   % DB
Event                                 Waits     Time(s)   (ms)   time Wait Class
------------------------------ ------------ ----------- ------ ------ ----------
buffer busy waits                 1,002,549       8,951      9   53.0 Concurrenc
DB CPU                                            4,724          28.0
latch: cache buffers chains      11,927,297       1,396      0    8.3 Concurrenc
direct path read                    121,767         863      7    5.1 User I/O
enq: DW - contention                209,278         627      3    3.7 Other
?Host CPU (CPUs:    8 Cores:    2 Sockets: )
~~~~~~~~         Load Average
               Begin       End     %User   %System      %WIO     %Idle
           --------- --------- --------- --------- --------- ---------
       38.7       3.5       57.9

Instance CPU
~~~~~~~~~~~~
              % of total CPU for Instance:      40.1
              % of busy  CPU for Instance:      95.2
  %DB time waiting for CPU - Resource Mgr:       0.0

Memory Statistics
~~~~~~~~~~~~~~~~~                       Begin          End
                  Host Mem (MB):     32,762.6     32,762.6
                   SGA use (MB):      4,656.0      4,992.0
                   PGA use (MB):        318.4        413.5
    % Host Mem used for SGA+PGA:        15.18        16.50

.....................
                                                             Avg
                                        %Time Total Wait    wait    Waits   % DB
Event                             Waits -outs   Time (s)    (ms)     /txn   time
-------------------------- ------------ ----- ---------- ------- -------- ------
buffer busy waits             1,002,549     0      8,951       9      3.9   53.0
latch: cache buffers chain   11,927,297     0      1,396       0     46.2    8.3
direct path read                121,767     0        863       7      0.5    5.1
enq: DW - contention            209,278     0        627       3      0.8    3.7
log file sync                   288,785     0        118       0      1.1     .7
SQL*Net more data from cli    1,176,770     0        103       0      4.6     .6


Buffer Wait Statistics                DB/Inst: ORA11G/ora11g  Snaps: 1259-1260
-> ordered by wait time desc, waits desc

Class                    Waits Total Wait Time (s)  Avg Time (ms)
------------------ ----------- ------------------- --------------
free list              818,606               8,780             11
undo header            512,358                 141              0
2nd level bmb          105,816                  29              0
.....

-> Total Logical Reads:     800,688,490
-> Captured Segments account for   19.8% of Total

           Tablespace                      Subobject  Obj.       Logical
Owner         Name    Object Name            Name     Type         Reads  %Total
---------- ---------- -------------------- ---------- ----- ------------ -------
EAG50NSJ   EAG50NSJ   SYS_LOB0000082335C00            LOB    127,182,208   15.88
SYS        SYSTEM     TS$                             TABLE    7,641,808     .95
..
       -------------------------------------------------------------

Segments by Physical Reads            DB/Inst: ORA11G/ora11g  Snaps: 1259-1260
-> Total Physical Reads:         103,481
-> Captured Segments account for  224.4% of Total

           Tablespace                      Subobject  Obj.      Physical
Owner         Name    Object Name            Name     Type         Reads  %Total
---------- ---------- -------------------- ---------- ----- ------------ -------
EAG50NSJ   EAG50NSJ   SYS_LOB0000082335C00            LOB        218,858  211.50
....

Best regards
Yuri Kogun

A couple of quick notes to anyone who is interested.
I was sent a few AWR reports and doing some tests on 11.2.0.2.
Interesting things are:

(a) SECUREFICHIERS have a free type of block called 'Clerks space', which is essentially space available of LOBs deleted; they are stored in v$ waitstat in the category 'free lists.

(b) code OP inserts a null value / empty_lob(), it inserts the BLOB and then updates the BLOB - this is why the code generates a lot of BLOBs empty and eventually fill constantly, sweeping and empty blocks of the "free list".

Possible solutions-
(1) use the core files because they use very different mechanisms
(2) do not insert and update the BLOB

In a way the problem exists because type LOB data aren't really OLTP objects, but the application manages LOB in a kind of type OLTP.

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600

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