Potential problems with copy_table_stats.

Guys,

I have a table with the DDL below containing a huge number of records.

CREATE TABLE APPEAL. CALL_DTL

(

DATE TIME STAMP,

MSN VARCHAR2 (32 BYTE) NOT NULL,

EVENT DATE NOT NULL,

)

PARTITION BY RANGE (EVENT)

(

CALL_P_01122015 PARTITION VALUES LESS THAN (TO_DATE (' 2015-12-01 00:00:00 ',' SYYYY-MM-DD HH24:MI:SS ',' NLS_CALENDAR = GREGORIAN ')),

CALL_P_02122015 PARTITION VALUES LESS THAN (TO_DATE (' 2015-12-02 00:00:00 ',' SYYYY-MM-DD HH24:MI:SS ',' NLS_CALENDAR = GREGORIAN '))

CALL_P_03122015 PARTITION VALUES LESS THAN (TO_DATE (' 2015-12-03 00:00:00 ',' SYYYY-MM-DD HH24:MI:SS ',' NLS_CALENDAR = GREGORIAN '))

);

We collect statistics for the 1st of the score of the month.

BEGIN

DBMS_STATS.gather_table_stats)

ownname = > 'CALL. "

tabname = > 'CALL_DTL ',.

partName = > "CALL_P_01122015"

estimate_percent = > 1,

GRANULARITY = > 'APPROX_GLOBAL AND PARTITION,

Cascade = > TRUE,

degree = > 15);

END;

/

And the stats will be copied in the rest of the partitions of the month.

Start

DBMS_STATS.copy_table_stats (ownname = > 'CALL')

tabname = > 'PMS_CALL_DETAIL ',.

srcpartname = > 'CALL_P_01122015 ',.

dstpartname = > 'CALL_P_02122015');

end;

/

Start

DBMS_STATS.copy_table_stats (ownname = > 'CALL')

tabname = > 'PMS_CALL_DETAIL ',.

srcpartname = > 'CALL_P_01122015 ',.

dstpartname = > 'CALL_P_03122015');

end;

/

Start

DBMS_STATS.copy_table_stats (ownname = > 'CALL')

tabname = > 'PMS_CALL_DETAIL ',.

srcpartname = > 'CALL_P_01122015 ',.

dstpartname = > 'CALL_P_04122015');

end;

/

...

...

Could someone advise if there could be potential problems with the copy of his stats?

What I see, HIGH_VALUE and LOW_VALUE are the same for every single partition for the SQL below:

Select nom_partition, HIGH_VALUE, LOW_VALUE from dba_part_col_statistics where table_name = column_name 'CALL' IN ("MSN");


Will this result in CBO plan fetching suboptimal on SQL running on the table with predicate such as MSN and EVENT?

Please suggest me resolution approaches.


Thank you!!


-Bibi





It will depend on (among other things), how use you it as a predicate and unique how the column is.

If you try to filter using predicates of beach in function with a range outside the stats then the CBO will be predicate weak cardinalities and therefore will promote the access of the index and nested loops which leads to this.

If you are filtering on equality predicates and the key is unique there should be no problem really.

It will depend also on whether the request knows which partition will be scanned, otherwise it will use global statistics, which will be probably the same as a partition, but they could easily change if you were to collect stats on any other partition.

You have an environment you can use a test and see approach?

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    http://answers.Microsoft.com/en-us/Windows/Forum/windows_vista-system/blue-screen-plug-and-play-detected-an-error-most/3deab2fa-4000-4136-8c78-a3d22b1db009

    We can analyze the minidumps if make you it available to the SkyDrive or another file
    sharing sites.

    ZIP or download the content of the C:\Windows\minidump

    Use SkyDrive to upload collected files
    http://social.technet.Microsoft.com/forums/en-us/w7itproui/thread/4fc10639-02dB-4665-993a-08d865088d65

    -------------------------------------------------------------------------

    Also this, so you can see the probable bluescreens.

    Windows Vista restarts automatically if your computer encounters an error that requires him to plant.
    (also Windows 7)
    http://www.winvistatips.com/disable-automatic-restart-T84.html

    ===========================================================

    Check out these utilities to see if information may be collected:

    It is an excellent tool for displaying the blue screen error information

    -Free - BlueScreenView scans all your minidump files created during "blue screen of death," collisions
    and displays information about all accidents of a table.
    http://www.NirSoft.NET/utils/blue_screen_view.html

    -------------

    MyEventViewer can be verified at the time of the blue screen (BSOD) within a second or so of the
    time of the BSOD to provide more information about the possible cause - see TIP.

    MyEventViewer - free - a simple alternative in the standard Windows Event Viewer.
    TIP - Options - Advanced filter allows you to see a period of time instead of the whole of the record-
    Set it for a bit before and after the time of the BSOD.
    http://www.NirSoft.NET/utils/my_event_viewer.html

    ------------

    AppCrashView - free - a small utility for Windows Vista and Windows 7 that displays the details of all the
    application goes down has occurred in your system. The information breaks down is extracted from the .wer
    the files created by the Windows Error Reporting (WER) of the operating system component of each
    time that an accident has occurred. AppCrashView also allows you to easily record the list of accidents to
    text/html/csv/xml file.
    http://www.NirSoft.NET/utils/app_crash_view.html

    I hope this helps.

    Rob Brown - Microsoft MVP<- profile="" -="" windows="" expert="" -="" consumer="" :="" bicycle=""><- mark="" twain="" said="" it="">

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