Timing a SQL query

Hi
Is there a way to time how long a SQL query takes to execute on the server itself? Currently I'm just whacking
declare @blah datetime
set @blah = getdate
select datediff(ms, @blah, getdate())
at the front and back of the passed SQL string and then taking the last result of the time. Now this works but I was wondering if there is some method in JDBC that would get you the same effedct without having to butcher the SQL code like I do

Was thinking about that and hoping to cut out network transmission time and whatever else Java might decide to do before actually executing the query (and if you have a slow pc that might also affect the Java time).
But yeah, sucks that JDBC doesn't have a feature like that. Oh well, I'll just leave it like it is (since the people I'm doing it for already said it's fine this way so if for some arb reason it breaks something, not my problem XD )

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    >
    I am using oracle version 11.2.0.1, I have set a cronjob which will run on every 15 minutes and give us a log file mentioning the execution time taken for that SQL query:-
    The above query will return the output as well as the time taken for execution of the query. I want to suppress the output of the query and only want the time taken to be printed. Is it possible by set commands. I have marked the output as bold and made it Italic.
    >
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  • OutOfMemory error while executing sql query

    Hello!
    My program gets multiple datas from database in every ten minutes, and stores them in memory for hundreds of users, requesting datas via web-interface simoultaneously.
    I dont have access to change database structures, write stored procedures, etc, just read from db.
    There is a table in database with lot of million rows, and sometimes when I try to execute a SELECT on this table it takes minutes to get back the result.
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                    System.out.println("ERROR: DataFactory.createPCVPPMforSiemens 1 :" + ex.getMessage());
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                    try {
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            }2. SiemensWorks.getPCVPPM()
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            sqlBean.setSqlValue(SiemensSQL.PCV_PPM);
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    2006-10-13 16:46:56 Active count: 4
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    2006-10-13 16:46:56 Priority: 5
    2006-10-13 16:46:57 Free memory: 192,228,944 bytes
    2006-10-13 16:46:57 Max memory: 332,988,416 bytes
    2006-10-13 16:46:57 Memory in use: 140,759,472 bytes
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    2006-10-13 16:46:57 0. Name: CachedLayerTimer
    2006-10-13 16:46:57 0. Id: 19
    2006-10-13 16:46:57 0. Priority: 5
    2006-10-13 16:46:57 0. Parent: SMT Refreshing Threads
    2006-10-13 16:46:57 0. State: RUNNABLE
    2006-10-13 16:46:57 0. Alive: true
    2006-10-13 16:46:57 java.io.FileOutputStream.close0(Native Method)
    2006-10-13 16:46:57 java.io.FileOutputStream.close(Unknown Source)
    2006-10-13 16:46:57 sun.nio.cs.StreamEncoder$CharsetSE.implClose(Unknown Source)
    2006-10-13 16:46:57 sun.nio.cs.StreamEncoder.close(Unknown Source)
    2006-10-13 16:46:57 java.io.OutputStreamWriter.close(Unknown Source)
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    2006-10-13 16:47:38 Active count: 4
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    2006-10-13 16:47:38 Priority: 5
    2006-10-13 16:47:42 Free memory: 35,316,120 bytes
    2006-10-13 16:47:42 Max memory: 332,988,416 bytes
    2006-10-13 16:47:42 Memory in use: 297,672,296 bytes
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    2006-10-13 16:47:42 0. Id: 19
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    Handing out connection 1 --> 10/13/2006 04:47:01 PM
    Handing out connection 0 --> 10/13/2006 04:47:02 PM
    Warning. Connection 0 in use for 3141 ms
    Warning. Connection 0 in use for 24891 ms
    ----> Error: Could not free connection!!!
    I would appreciate for any help.

    What does your query bring back from this table?This is the query:
    SELECT case sum(c.picked) when 0 then 0 else
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    FROM sip_comp c
    LEFT JOIN sip_pcb pc ON pc.id=c.pcbid
    LEFT JOIN sip_period p on p.id=pc.periodid
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    | 0 | SELECT STATEMENT | | 1243 | 104K| 182 (4)| 00:00:03 |
    | 1 | NESTED LOOPS OUTER | | 1243 | 104K| 182 (4)| 00:00:03 |
    |* 2 | TABLE ACCESS FULL | OBJ$ | 1243 | 98197 | 142 (5)| 00:00:02 |
    | 3 | TABLE ACCESS CLUSTER| TAB$ | 1 | 7 | 1 (0)| 00:00:01 |
    |* 4 | INDEX UNIQUE SCAN | I_OBJ# | 1 | | 0 (0)| 00:00:01 |
    PLAN_TABLE_OUTPUT
    Predicate Information (identified by operation id):
    2 - filter("O"."TYPE#"<=5 AND "O"."OWNER#"=USERENV('SCHEMAID') AND
    "O"."TYPE#">=2 AND "O"."LINKNAME" IS NULL)
    4 - access("O"."OBJ#"="T"."OBJ#"(+))
    18 rows selected.
    SQL>
    Edited by: 862640 on Nov 27, 2011 1:43 AM
    Edited by: 862640 on Nov 27, 2011 1:49 AM
    Edited by: 862640 on Nov 27, 2011 1:53 AM

  • Speed of an SQL query?

    How can we see how long our SQL query took to execute?

    or
    set timing on
    in sql*plus if you just want a basic idea.

  • How to compare same SQL query performance in different DB servers.

    We have Production and Validation Environment of Oracle11g DB on two Solaris OSs.
    H/W and DB,etc configurations of two Oracle DBs are almost same in PROD and VAL.
    But we detected large SQL query performace difference in PROD DB and VAL DB in same SQL query.
    I would like to find and solve the cause of this situation.
    How could I do that ?
    I plan to compare SQL execution plan in PROD and VAL DB and index fragmentations.
    Before that I thought I need to keep same condition of DB statistics information in PROD and VAL DB.
    So, I plan to execute alter system FLUSH BUFFER_CACHE;
    But I am worring about bad effects of alter system FLUSH BUFFER_CACHE; to end users
    If we did alter system FLUSH BUFFER_CACHE; and got execution plan of that SQL query in the time end users do not use that system ,
    there is not large bad effect to end users after those operations?
    Could you please let me know the recomendation to compare SQL query performace ?

    Thank you.
    I got AWR report for only VAL DB server but it looks strange.
    Is there any thing wrong in DB or how to get AWR report ?
    Host Name
    Platform
    CPUs
    Cores
    Sockets
    Memory (GB)
    xxxx
    Solaris[tm] OE (64-bit)
    .00
    Snap Id
    Snap Time
    Sessions
    Cursors/Session
    Begin Snap:
    xxxx
    13-Apr-15 04:00:04
    End Snap:
    xxxx
    14-Apr-15 04:00:22
    Elapsed:
    1,440.30 (mins)
    DB Time:
    0.00 (mins)
    Report Summary
    Cache Sizes
    Begin
    End
    Buffer Cache:
    M
    M
    Std Block Size:
    K
    Shared Pool Size:
    0M
    0M
    Log Buffer:
    K
    Load Profile
    Per Second
    Per Transaction
    Per Exec
    Per Call
    DB Time(s):
    0.0
    0.0
    0.00
    0.00
    DB CPU(s):
    0.0
    0.0
    0.00
    0.00
    Redo size:
    Logical reads:
    0.0
    1.0
    Block changes:
    0.0
    1.0
    Physical reads:
    0.0
    1.0
    Physical writes:
    0.0
    1.0
    User calls:
    0.0
    1.0
    Parses:
    0.0
    1.0
    Hard parses:
    W/A MB processed:
    16.7
    1,442,472.0
    Logons:
    Executes:
    0.0
    1.0
    Rollbacks:
    Transactions:
    0.0
    Instance Efficiency Percentages (Target 100%)
    Buffer Nowait %:
    Redo NoWait %:
    Buffer Hit %:
    In-memory Sort %:
    Library Hit %:
    96.69
    Soft Parse %:
    Execute to Parse %:
    0.00
    Latch Hit %:
    Parse CPU to Parse Elapsd %:
    % Non-Parse CPU:
    Shared Pool Statistics
    Begin
    End
    Memory Usage %:
    % SQL with executions>1:
    34.82
    48.31
    % Memory for SQL w/exec>1:
    63.66
    73.05
    Top 5 Timed Foreground Events
    Event
    Waits
    Time(s)
    Avg wait (ms)
    % DB time
    Wait Class
    DB CPU
    0
    100.00
    Host CPU (CPUs: Cores: Sockets: )
    Load Average Begin
    Load Average End
    %User
    %System
    %WIO
    %Idle
    Instance CPU
    %Total CPU
    %Busy CPU
    %DB time waiting for CPU (Resource Manager)
    Memory Statistics
    Begin
    End
    Host Mem (MB):
    SGA use (MB):
    46,336.0
    46,336.0
    PGA use (MB):
    713.6
    662.6
    % Host Mem used for SGA+PGA:
    Time Model Statistics
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Operating System Statistics
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Operating System Statistics - Detail
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Foreground Wait Class
    s - second, ms - millisecond - 1000th of a second
    ordered by wait time desc, waits desc
    %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
    Captured Time accounts for % of Total DB time .00 (s)
    Total FG Wait Time: (s) DB CPU time: .00 (s)
    Wait Class
    Waits
    %Time -outs
    Total Wait Time (s)
    Avg wait (ms)
    %DB time
    DB CPU
    0
    100.00
    Back to Wait Events Statistics
    Back to Top
    Foreground Wait Events
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Background Wait Events
    ordered by wait time desc, waits desc (idle events last)
    Only events with Total Wait Time (s) >= .001 are shown
    %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
    Event
    Waits
    %Time -outs
    Total Wait Time (s)
    Avg wait (ms)
    Waits /txn
    % bg time
    log file parallel write
    527,034
    0
    2,209
    4
    527,034.00
    db file parallel write
    381,966
    0
    249
    1
    381,966.00
    os thread startup
    2,650
    0
    151
    57
    2,650.00
    latch: messages
    125,526
    0
    89
    1
    125,526.00
    control file sequential read
    148,662
    0
    54
    0
    148,662.00
    control file parallel write
    41,935
    0
    28
    1
    41,935.00
    Log archive I/O
    5,070
    0
    14
    3
    5,070.00
    Disk file operations I/O
    8,091
    0
    10
    1
    8,091.00
    log file sequential read
    3,024
    0
    6
    2
    3,024.00
    db file sequential read
    1,299
    0
    2
    2
    1,299.00
    latch: shared pool
    722
    0
    1
    1
    722.00
    enq: CF - contention
    4
    0
    1
    208
    4.00
    reliable message
    1,316
    0
    1
    1
    1,316.00
    log file sync
    71
    0
    1
    9
    71.00
    enq: CR - block range reuse ckpt
    36
    0
    0
    13
    36.00
    enq: JS - queue lock
    459
    0
    0
    1
    459.00
    log file single write
    414
    0
    0
    1
    414.00
    enq: PR - contention
    5
    0
    0
    57
    5.00
    asynch descriptor resize
    67,076
    100
    0
    0
    67,076.00
    LGWR wait for redo copy
    5,184
    0
    0
    0
    5,184.00
    rdbms ipc reply
    1,234
    0
    0
    0
    1,234.00
    ADR block file read
    384
    0
    0
    0
    384.00
    SQL*Net message to client
    189,490
    0
    0
    0
    189,490.00
    latch free
    559
    0
    0
    0
    559.00
    db file scattered read
    17
    0
    0
    6
    17.00
    resmgr:internal state change
    1
    100
    0
    100
    1.00
    direct path read
    301
    0
    0
    0
    301.00
    enq: RO - fast object reuse
    35
    0
    0
    2
    35.00
    direct path write
    122
    0
    0
    1
    122.00
    latch: cache buffers chains
    260
    0
    0
    0
    260.00
    db file parallel read
    1
    0
    0
    41
    1.00
    ADR file lock
    144
    0
    0
    0
    144.00
    latch: redo writing
    55
    0
    0
    1
    55.00
    ADR block file write
    120
    0
    0
    0
    120.00
    wait list latch free
    2
    0
    0
    10
    2.00
    latch: cache buffers lru chain
    44
    0
    0
    0
    44.00
    buffer busy waits
    3
    0
    0
    2
    3.00
    latch: call allocation
    57
    0
    0
    0
    57.00
    SQL*Net more data to client
    55
    0
    0
    0
    55.00
    ARCH wait for archivelog lock
    78
    0
    0
    0
    78.00
    rdbms ipc message
    3,157,653
    40
    4,058,370
    1285
    3,157,653.00
    Streams AQ: qmn slave idle wait
    11,826
    0
    172,828
    14614
    11,826.00
    DIAG idle wait
    170,978
    100
    172,681
    1010
    170,978.00
    dispatcher timer
    1,440
    100
    86,417
    60012
    1,440.00
    Streams AQ: qmn coordinator idle wait
    6,479
    48
    86,413
    13337
    6,479.00
    shared server idle wait
    2,879
    100
    86,401
    30011
    2,879.00
    Space Manager: slave idle wait
    17,258
    100
    86,324
    5002
    17,258.00
    pmon timer
    46,489
    62
    86,252
    1855
    46,489.00
    smon timer
    361
    66
    86,145
    238628
    361.00
    VKRM Idle
    1
    0
    14,401
    14400820
    1.00
    SQL*Net message from client
    253,909
    0
    419
    2
    253,909.00
    class slave wait
    379
    0
    0
    0
    379.00
    Back to Wait Events Statistics
    Back to Top
    Wait Event Histogram
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Wait Event Histogram Detail (64 msec to 2 sec)
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Wait Event Histogram Detail (4 sec to 2 min)
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Wait Event Histogram Detail (4 min to 1 hr)
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Service Statistics
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    Service Wait Class Stats
    No data exists for this section of the report.
    Back to Wait Events Statistics
    Back to Top
    SQL Statistics
    SQL ordered by Elapsed Time
    SQL ordered by CPU Time
    SQL ordered by User I/O Wait Time
    SQL ordered by Gets
    SQL ordered by Reads
    SQL ordered by Physical Reads (UnOptimized)
    SQL ordered by Executions
    SQL ordered by Parse Calls
    SQL ordered by Sharable Memory
    SQL ordered by Version Count
    Complete List of SQL Text
    Back to Top
    SQL ordered by Elapsed Time
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by CPU Time
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by User I/O Wait Time
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by Gets
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by Reads
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by Physical Reads (UnOptimized)
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by Executions
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by Parse Calls
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by Sharable Memory
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    SQL ordered by Version Count
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    Complete List of SQL Text
    No data exists for this section of the report.
    Back to SQL Statistics
    Back to Top
    Instance Activity Statistics
    Instance Activity Stats
    Instance Activity Stats - Absolute Values
    Instance Activity Stats - Thread Activity
    Back to Top
    Instance Activity Stats
    No data exists for this section of the report.
    Back to Instance Activity Statistics
    Back to Top
    Instance Activity Stats - Absolute Values
    No data exists for this section of the report.
    Back to Instance Activity Statistics
    Back to Top
    Instance Activity Stats - Thread Activity
    Statistics identified by '(derived)' come from sources other than SYSSTAT
    Statistic
    Total
    per Hour
    log switches (derived)
    69
    2.87
    Back to Instance Activity Statistics
    Back to Top
    IO Stats
    IOStat by Function summary
    IOStat by Filetype summary
    IOStat by Function/Filetype summary
    Tablespace IO Stats
    File IO Stats
    Back to Top
    IOStat by Function summary
    'Data' columns suffixed with M,G,T,P are in multiples of 1024 other columns suffixed with K,M,G,T,P are in multiples of 1000
    ordered by (Data Read + Write) desc
    Function Name
    Reads: Data
    Reqs per sec
    Data per sec
    Writes: Data
    Reqs per sec
    Data per sec
    Waits: Count
    Avg Tm(ms)
    Others
    28.8G
    20.55
    .340727
    16.7G
    2.65
    .198442
    1803K
    0.01
    Direct Reads
    43.6G
    57.09
    .517021
    411M
    0.59
    .004755
    0
    LGWR
    19M
    0.02
    .000219
    41.9G
    21.87
    .496493
    2760
    0.08
    Direct Writes
    16M
    0.00
    .000185
    8.9G
    1.77
    .105927
    0
    DBWR
    0M
    0.00
    0M
    6.7G
    4.42
    .079670
    0
    Buffer Cache Reads
    3.1G
    3.67
    .037318
    0M
    0.00
    0M
    260.1K
    3.96
    TOTAL:
    75.6G
    81.33
    .895473
    74.7G
    31.31
    .885290
    2065.8K
    0.51
    Back to IO Stats
    Back to Top
    IOStat by Filetype summary
    'Data' columns suffixed with M,G,T,P are in multiples of 1024 other columns suffixed with K,M,G,T,P are in multiples of 1000
    Small Read and Large Read are average service times, in milliseconds
    Ordered by (Data Read + Write) desc
    Filetype Name
    Reads: Data
    Reqs per sec
    Data per sec
    Writes: Data
    Reqs per sec
    Data per sec
    Small Read
    Large Read
    Data File
    53.2G
    78.33
    .630701
    8.9G
    7.04
    .105197
    0.37
    21.51
    Log File
    13.9G
    0.18
    .164213
    41.9G
    21.85
    .496123
    0.02
    2.93
    Archive Log
    0M
    0.00
    0M
    13.9G
    0.16
    .164213
    Temp File
    5.6G
    0.67
    .066213
    8.1G
    0.80
    .096496
    5.33
    3713.27
    Control File
    2.9G
    2.16
    .034333
    2G
    1.46
    .023247
    0.05
    19.98

  • Reg : Exection time of SQL query

    Hi All,
    How to identify the oracle sql query exection time.
    Thanks in Advance.

    Hi,
    try This
    SQL> set timing on;
    SQL> select * from dual;
    D
    X
    Elapsed: 00:00:00.00
    SQL> set timing off;
    SQL> select * from dual;
    D
    XReagrds
    umi

  • SQL Query time

    hello,
    I want to calculate the sql query execution time.Like my query is
    select column,,,,, from tab;
    I want to know how much time it consumed to return results.
    How can I do so?

    SET TIMING
    http://download.oracle.com/docs/cd/B19306_01/server.102/b14357/ch12040.htm#SQPUG063
    Adith

  • SQL Query statists?

    I'd like to know if there is any easy, and convenient way, for someone to execute an SQL query an calculate, these measurments relative to the query:
    1) The I/O performed
    2)Number Read I/O
    3) Number of Write out I/O
    (such that 2+3 = 1
    4) Number of buffered reads
    5)Query Execution time
    6) Query CPU usage
    I've heard mention of such statisctis in views such as V$OSSTAT, etc.
    But these views give the current values, and not the specific cumulative values. Such as: cummulative CPU usage time since start of the query; cumulative I/O since query begin, etc...
    What is the right approach to this. Is it through the V$SESSION view? Would you about it by storing the V$SESSIOn values before the query, you run the query, and get the new V$SESSION values?

    Well, actually i stayed here a little longer to try you part 2 of the manual.
    It worked fine, following comes the output, originating from a spool file, of my first experiment:
    Connected.
    SQL> set timing on trimspool on linesize 250 pagesize 999
    SQL>
    SQL> -- system environment can be checked with:
    SQL> -- show parameter statis
    SQL> -- this show a series of parameters related to statistics
    SQL>
    SQL> -- this setting can influence your sorting
    SQL> -- in particular if an index can satisfy your sort order
    SQL> -- alter session set nls_language = 'AMERICAN';
    SQL>
    SQL>
    SQL> rem Set the ARRAYSIZE according to your application
    SQL> set arraysize 15 termout off
    SQL>
    SQL> spool diag2.log
    SQL>
    SQL> select * from table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST'))
    PLAN_TABLE_OUTPUT
    SQL_ID  b4j5rmwug3u8p, child number 0
    SELECT USRID, FAVF FROM  (SELECT ID as USRID, FAVF1, FAVF2, FAVF3,
    FAVF4, FAVF5   FROM PROFILE) P UNPIVOT  (FAVF FOR CNAME IN   ( FAVF1,
    FAVF2, FAVF3, FAVF4, FAVF5)) FAVFRIEND
    Plan hash value: 888567555
    | Id  | Operation           | Name    | Starts | E-Rows | A-Rows |   A-Time   |
    Buffers |
    |   0 | SELECT STATEMENT    |         |      1 |        |      5 |00:00:00.01 |
          8 |
    |*  1 |  VIEW               |         |      1 |      5 |      5 |00:00:00.01 |
          8 |
    |   2 |   UNPIVOT           |         |      1 |        |      5 |00:00:00.01 |
          8 |
    |   3 |    TABLE ACCESS FULL| PROFILE |      1 |      1 |      1 |00:00:00.01 |
          8 |
    Predicate Information (identified by operation id):
       1 - filter("unpivot_view_013"."FAVF" IS NOT NULL)
    Note
       - dynamic sampling used for this statement
    26 rows selected.
    Elapsed: 00:00:00.14
    SQL>
    SQL> spool off
    SQL>
    SQL> exit
    Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Pr
    oduction
    With the OLAP, Data Mining and Real Application Testing options
    C:\Documents and Settings\Administrator\My Documents\scripts\oracle\99templates_
    autotrace>my_part2_template.bat
    C:\Documents and Settings\Administrator\My Documents\scripts\oracle\99templates_
    autotrace>sqlplus /NOLOG @my_part2_template.sql
    SQL*Plus: Release 11.1.0.7.0 - Production on Qui Jul 9 22:00:39 2009
    Copyright (c) 1982, 2008, Oracle.  All rights reserved.
    Connected.
    SQL> set timing on trimspool on linesize 250 pagesize 999
    SQL>
    SQL> -- system environment can be checked with:
    SQL> -- show parameter statis
    SQL> -- this show a series of parameters related to statistics
    SQL>
    SQL> -- this setting can influence your sorting
    SQL> -- in particular if an index can satisfy your sort order
    SQL> -- alter session set nls_language = 'AMERICAN';
    SQL>
    SQL>
    SQL> rem Set the ARRAYSIZE according to your application
    SQL> set arraysize 15 termout off
    SQL>
    SQL> spool diag2.log
    SQL>
    SQL> select * from table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST'))
    PLAN_TABLE_OUTPUT
    SQL_ID  b4j5rmwug3u8p, child number 0
    SELECT USRID, FAVF FROM  (SELECT ID as USRID, FAVF1, FAVF2, FAVF3,
    FAVF4, FAVF5   FROM PROFILE) P UNPIVOT  (FAVF FOR CNAME IN   ( FAVF1,
    FAVF2, FAVF3, FAVF4, FAVF5)) FAVFRIEND
    Plan hash value: 888567555
    | Id  | Operation           | Name    | Starts | E-Rows | A-Rows |   A-Time   |
    Buffers |
    |   0 | SELECT STATEMENT    |         |      1 |        |      5 |00:00:00.01 |
          8 |
    |*  1 |  VIEW               |         |      1 |      5 |      5 |00:00:00.01 |
          8 |
    |   2 |   UNPIVOT           |         |      1 |        |      5 |00:00:00.01 |
          8 |
    |   3 |    TABLE ACCESS FULL| PROFILE |      1 |      1 |      1 |00:00:00.01 |
          8 |
    Predicate Information (identified by operation id):
       1 - filter("unpivot_view_013"."FAVF" IS NOT NULL)
    Note
       - dynamic sampling used for this statement
    26 rows selected.
    Elapsed: 00:00:00.01
    SQL>
    SQL> spool off
    SQL>
    SQL>
    SQL> -- rem End of Part 2
    SQL> show parameter statis
    NAME                                 TYPE        VALUE
    optimizer_use_pending_statistics     boolean     FALSE
    statistics_level                     string      ALL
    timed_os_statistics                  integer     5
    timed_statistics                     boolean     TRUE
    SQL> quitIf you notice, at the end of the execution I print my statistics session environment. The statistics_level was set to ALL, as you advisied. But the output I obtained seems a lot more incomplete than the one I got from using the autotrace feature.
    Am I missing something. Could it have something to do with the fact that I am running as system and not as sysdba? System shoul have enough permissions to access its session environment statistic values.
    May be it's just a language issue (I'm not a native speaker either) but your understanding of Oracle's read consistency model seems to be questionable.No, you could be right; my understanding is questionable indeed. I am familiar with general concepts of concurrency.
    Things like: Read uncommited data:
    T1 Writes A; T2 Reads A -> Here is a conflict
    This enough for you to not be able to guarantee that the execution is serializable.
    T1 Reads A, T2 Writes A and commits, T1 Reads A - You get another confli, the Unrepeatable read.
    And so on.
    I am also familiar with the different levels of atomicity that databse systems in general give you.
    Conflict Serializable, normally implemented by using the strict phase locking mechanism.
    Repeatable Reads, you lock the rows you access during a transaction. You are guaranteed that those data values you access do not change value; but other entires in the table could be put.
    Unrepeatable reads. Only the data you modify is guaranteed to stay the same. Only you write locks are kept throughout the transaction. And so on.
    But anyway...
    What you explained in your post is more or less what I was saying. In you case much more clear than in mine.
    For instance, if a thread T1 reads A; a thread T2 Writes on A
    In oracle, you could have the thread T1 read A again without geting an Unrepeatable Read error. This is strange: in a normal system you directly get an exception telling you that your vision of the system is inconsistent. But in oracel you can do so, because oracle tries to fetch from the Undo Table Space that same data objects consistent with the view of the system you had when you first accessed it. It looks for a block with an an SCN older than the current version SCN. Or something like that. The only problem is that those modified blocks do not stay indefinitely there. Once a transaction commits you have a time bomb in your hands. That is, if you are working with that is not at its most current version.
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    My best regards, and deepest thanks for your time and attention.
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    Wind Zhang
    TechNet Community Support

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    Vladimir

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