When tables should be analyzed

hi all,
i want to know on what basis or how a person woul be able to know when table should be analyzed..........
generally we have a tables that have been analyzed on 06/05/2008 15:50:15 query that i have used is
select      OWNER,
     TABLE_NAME,
     to_char(LAST_ANALYZED,'MM/DD/YYYY HH24:MI:SS') last_analyzed
from      dba_tab_columns
where      OWNER ='name';

burleson wrote:
Reanalyze ONLY when you want your SQL execution plans to change . . .
If you are satisfied with your plans, why change them?
Hi Don
Ummm, but if you don't update your statistics, your execution plans can change as well ...
It's incorrect to suggest that not changing statistics means your plans won't change. Two things of course continue to change even if you don't update the statistics, the data and the data being selected.
By following your advice, you might not have changed stats from 31 Dec 2005. Therefore Oracle thinks the max date value in your data is still 31 Dec 2005. But of course you now data as of say Jan 3 2009. When you query data of interest but the range of data you want is between say 1 Jan 2008 and 31 Dec 2008, how will the CBO determine the correct cardinality if it still thinks the max date is 31 Dec 2005 ?
Actual answer is version dependent but it will get the cardinality way wrong and likely generate a poor execution plan.
So perhaps your might want to update your statistics because you're satisfied with your plans and you don't won't them to change and suddenly go "wrong" by letting your statistics go stale.
Hope this helps.
Cheers
Richard Foote
http://richardfoote.wordpress.com/

Similar Messages

When table should be analyzed?

Hi,
At what frequently table should be analyzed.It has 1.5million data and 'Compute statistics' or 'estimate statistics' would be fine?
Thanks,
Regards,
Vinoth

Vinoth,
With "compute statistics" and "estimate statistics" words flying around, I am almost certain that you are talking about Analyze command. I am not sure that you are aware that its been not suggested to be used for gathering statistics from quite long.Oracle is recommending to use dbms_stats package for doing the same. Its more better as compared to analyze command.
That said, I am in agreement with what Nicolas mentioned i.e. that estimation "in general" is going to be working fine. With Anayze command, you don't have control to tell oracle how much of the table is suitable for the estimation. This can be more finely done with the dbms_stats's estimate_percent which can be set to a suitable value. With 10g , the value can be left to automatically collected by oracle (though not a good idea).
What should be the frequency of the stats gathering, I guess no one woul dbe able to tell you from here about your table as we don't know how its being used? In a generic explanation, if its not a very frequently used table than you can leave it with the same stats uptil the next ETL. If its a OLTP table than you have to see how much its being changed with enabling monitoring over it,an option which again with the version not required.
HTH
Aman....

To set HOTSPOT for a field in ALV-oops and when clecked should call transac

Hi,
I need to set HOTSPOT for a field in O/P list using ALV-oops and when clecked should take me to Transaction VA01. Please help....
Thanks,
Prabhu

Hi,
Please go through this code it may help u.
REPORT zcls_alv_oops MESSAGE-ID z1.
TABLES : mara.
Types Declaration..\
TYPES :
BEGIN OF t_mara,
matnr TYPE matnr,
mtart TYPE mtart,
maktx TYPE maktx,
END OF t_mara,
BEGIN OF t_marc,
matnr TYPE matnr,
werks TYPE werks_d,
mtart TYPE mtart,
maktx TYPE maktx,
END OF t_marc.
Internal Tables Declaration..\
DATA :
i_mara TYPE TABLE OF t_mara,
i_marc TYPE TABLE OF t_marc,
i_fcat1 TYPE lvc_t_fcat,
i_fcat2 TYPE lvc_t_fcat.
Constants Declaration..\
CONSTANTS :
c_cont1 TYPE scrfname VALUE 'CONT1',
c_cont2 TYPE scrfname VALUE 'CONT2'.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
SELECT-OPTIONS:
s_matnr FOR mara-matnr NO INTERVALS.
SELECTION-SCREEN SKIP 1.
PARAMETERS :
p_hotspt RADIOBUTTON GROUP r1 DEFAULT 'X',
p_bttn RADIOBUTTON GROUP r1.
SELECTION-SCREEN END OF BLOCK b1.
\* Class forward referncing.
CLASS lcl_rcvr_class DEFINITION DEFERRED.
\* Pointers Declaration..
DATA :
lp_rcvr TYPE REF TO lcl_rcvr_class,
lp_cont1 TYPE REF TO cl_gui_custom_container,
lp_cont2 TYPE REF TO cl_gui_custom_container,
lp_grid1 TYPE REF TO cl_gui_alv_grid,
lp_grid2 TYPE REF TO cl_gui_alv_grid.
\* Local Class Definiton.
CLASS lcl_rcvr_class DEFINITION.
PUBLIC SECTION.
METHODS :
hotspot_click FOR EVENT hotspot_click OF cl_gui_alv_grid
IMPORTING e_row_id e_column_id es_row_no,
handle_double_click FOR EVENT double_click OF cl_gui_alv_grid
IMPORTING e_row e_column.
ENDCLASS.
\* Local Class Implementation.
CLASS lcl_rcvr_class IMPLEMENTATION.
METHOD hotspot_click.
DATA :
wa_mara TYPE t_mara,
wa_marc TYPE t_marc.
DATA :
l_index TYPE sy-tabix.
READ TABLE i_mara INTO wa_mara INDEX e_row_id-index.
IF sy-subrc EQ 0.
REFRESH i_marc.
SELECT matnr
werks
INTO TABLE i_marc
FROM marc
WHERE matnr EQ wa_mara-matnr.
IF sy-subrc EQ 0.
LOOP AT i_marc INTO wa_marc.
l_index = sy-tabix.
wa_marc-mtart = wa_mara-mtart.
wa_marc-maktx = wa_mara-maktx.
MODIFY i_marc FROM wa_marc INDEX l_index
TRANSPORTING mtart maktx.
ENDLOOP.
CALL SCREEN 200.
ELSE.
MESSAGE e121 WITH text-005 wa_mara-matnr.
ENDIF.
ENDIF.
ENDMETHOD.
METHOD handle_double_click.
DATA :
wa_mara TYPE t_mara,
wa_marc TYPE t_marc.
DATA :
l_index TYPE sy-tabix.
READ TABLE i_mara INTO wa_mara INDEX e_row-index.
IF sy-subrc EQ 0.
REFRESH i_marc.
SELECT matnr
werks
INTO TABLE i_marc
FROM marc
WHERE matnr EQ wa_mara-matnr.
IF sy-subrc EQ 0.
LOOP AT i_marc INTO wa_marc.
l_index = sy-tabix.
wa_marc-mtart = wa_mara-mtart.
wa_marc-maktx = wa_mara-maktx.
MODIFY i_marc FROM wa_marc INDEX l_index
TRANSPORTING mtart maktx.
ENDLOOP.
CALL SCREEN 200.
ELSE.
MESSAGE e121 WITH text-005 wa_mara-matnr.
ENDIF.
ENDIF.
ENDMETHOD.
ENDCLASS.
\* Start of Selection
START-OF-SELECTION.
\* Extract the Material Master data for the Input Material.
SELECT a~matnr
a~mtart
b~maktx
INTO TABLE i_mara
FROM mara AS a
INNER JOIN makt AS b
ON a~matnr EQ b~matnr
WHERE a~matnr IN s_matnr
AND b~spras EQ sy-langu.
END-OF-SELECTION.
IF NOT i_mara\[\] IS INITIAL.
\* Call Screen to display the Material Master data.
CALL SCREEN 100.
ELSE.
MESSAGE s121 WITH text-006.
ENDIF.
\*& Module DISP_GRID OUTPUT
\* text
MODULE disp_grid OUTPUT.
\* Build the Field catelog for Material Master data.
PERFORM build_fcat.
\* Display the Material Master data using ALV.
PERFORM disp_alv.
ENDMODULE. " DISP_GRID OUTPUT
\*& Module USER_COMMAND_0100 INPUT
\* text
MODULE user_command_0100 INPUT.
\*when exit or cancel is clicked program has to come out
CASE sy-ucomm.
WHEN 'EXIT' OR 'CANC'.
LEAVE PROGRAM.
WHEN 'BACK'.
LEAVE TO SCREEN 0.
ENDCASE.
ENDMODULE. " USER_COMMAND_0100 INPUT
\*& Form build_fcat
\* text
\* \--> p1 text
\* <-\- p2 text
FORM build_fcat.
DATA : ws_fcat TYPE lvc_s_fcat.
ws_fcat-fieldname = 'MATNR'.
ws_fcat-scrtext_m = text-001.
ws_fcat-tabname = 'I_MARA'.
IF p_hotspt EQ 'X'.
ws_fcat-hotspot = 'X'.
ENDIF.
APPEND ws_fcat TO i_fcat1.
CLEAR ws_fcat.
ws_fcat-fieldname = 'MTART'.
ws_fcat-scrtext_m = text-002.
ws_fcat-tabname = 'I_MARA'.
APPEND ws_fcat TO i_fcat1.
CLEAR ws_fcat.
ws_fcat-fieldname = 'MAKTX'.
ws_fcat-scrtext_m = text-003.
ws_fcat-tabname = 'I_MARA'.
APPEND ws_fcat TO i_fcat1.
CLEAR ws_fcat.
ENDFORM. " build_fcat
\*& Form disp_alv
\* text
\* \--> p1 text
\* <-\- p2 text
FORM disp_alv.
IF lp_cont1 IS INITIAL.
\* Create the Container Object of Material Master.
CREATE OBJECT lp_cont1
EXPORTING
container_name = c_cont1
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
create_error = 3
lifetime_error = 4
lifetime_dynpro_dynpro_link = 5
others = 6 .
IF sy-subrc NE 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ELSE.
\* Create the Object for Grid of Material Master.
CREATE OBJECT lp_grid1
EXPORTING
i_parent = lp_cont1
EXCEPTIONS
error_cntl_create = 1
error_cntl_init = 2
error_cntl_link = 3
error_dp_create = 4
others = 5.
IF sy-subrc NE 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ELSE.
\* Dipslay Material Master data by calling method.
CALL METHOD lp_grid1->set_table_for_first_display
CHANGING
it_outtab = i_mara
it_fieldcatalog = i_fcat1
EXCEPTIONS
invalid_parameter_combination = 1
program_error = 2
too_many_lines = 3
OTHERS = 4.
IF sy-subrc NE 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ELSE.
\* Set Handler for the Hot Spot Event.
CREATE OBJECT lp_rcvr.
IF p_hotspt EQ 'X'.
SET HANDLER lp_rcvr->hotspot_click FOR lp_grid1.
ELSE.
SET HANDLER lp_rcvr->handle_double_click FOR lp_grid1.
ENDIF.
ENDIF.
ENDIF.
ENDIF.
ENDIF.
ENDFORM. " disp_alv
\*& Module STATUS_0100 OUTPUT
\* text
MODULE status_0100 OUTPUT.
SET PF-STATUS 'MAIN_STAT'.
SET TITLEBAR 'T_100'.
ENDMODULE. " STATUS_0100 OUTPUT
\*& Module STATUS_0200 OUTPUT
\* text
MODULE status_0200 OUTPUT.
SET PF-STATUS 'PLANT_STAT'.
SET TITLEBAR 'T_200'.
ENDMODULE. " STATUS_0200 OUTPUT
\*& Module DISP_GRID_plant OUTPUT
\* text
MODULE disp_grid_plant OUTPUT.
\* Build the Field catelog for Material Plant data.
PERFORM build_fcat_plant.
\* Display the Material Master Plant data using ALV.
PERFORM disp_alv_plant.
ENDMODULE. " DISP_GRID_plant OUTPUT
\*& Module USER_COMMAND_0200 INPUT
\* text
MODULE user_command_0200 INPUT.
\*when exit or cancel is clicked program has to come out
CASE sy-ucomm.
WHEN 'EXIT' OR 'CANC'.
LEAVE PROGRAM.
WHEN 'BACK'.
LEAVE TO SCREEN 0.
ENDCASE.
ENDMODULE. " USER_COMMAND_0200 INPUT
\*& Form build_fcat_plant
\* text
\* \--> p1 text
\* <-\- p2 text
FORM build_fcat_plant.
DATA : ws_fcat TYPE lvc_s_fcat.
ws_fcat-fieldname = 'MATNR'.
ws_fcat-scrtext_m = text-001.
ws_fcat-tabname = 'I_MARC'.
APPEND ws_fcat TO i_fcat2.
CLEAR ws_fcat.
ws_fcat-fieldname = 'WERKS'.
ws_fcat-scrtext_m = text-004.
ws_fcat-tabname = 'I_MARC'.
APPEND ws_fcat TO i_fcat2.
CLEAR ws_fcat.
ws_fcat-fieldname = 'MTART'.
ws_fcat-scrtext_m = text-002.
ws_fcat-tabname = 'I_MARC'.
APPEND ws_fcat TO i_fcat2.
CLEAR ws_fcat.
ws_fcat-fieldname = 'MAKTX'.
ws_fcat-scrtext_m = text-003.
ws_fcat-tabname = 'I_MARC'.
APPEND ws_fcat TO i_fcat2.
CLEAR ws_fcat.
ENDFORM. " build_fcat_plant
\*& Form disp_alv_plant
\* text
\* \--> p1 text
\* <-\- p2 text
FORM disp_alv_plant.
IF lp_cont2 IS INITIAL.
\* Create the Container Object of Material Plant data.
CREATE OBJECT lp_cont2
EXPORTING
container_name = c_cont2
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
create_error = 3
lifetime_error = 4
lifetime_dynpro_dynpro_link = 5
others = 6.
IF sy-subrc NE 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ELSE.
\* Create the Object for Grid of Material Plant data.
CREATE OBJECT lp_grid2
EXPORTING
i_parent = lp_cont2
EXCEPTIONS
error_cntl_create = 1
error_cntl_init = 2
error_cntl_link = 3
error_dp_create = 4
others = 5.
IF sy-subrc NE 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ELSE.
\* Dipslay Material Plant data by calling method.
CALL METHOD lp_grid2->set_table_for_first_display
CHANGING
it_outtab = i_marc
it_fieldcatalog = i_fcat2
EXCEPTIONS
invalid_parameter_combination = 1
program_error = 2
too_many_lines = 3
OTHERS = 4.
IF sy-subrc NE 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
ENDIF.
ENDIF.
ELSE.
\* Call method 'REFRESH_TABLE_DISPLAY' to refresh the grid data.
CALL METHOD lp_grid2->refresh_table_display.
ENDIF.
ENDFORM. " disp_alv_plant

How to make screen field enable when table control gives an error

Hi,
I had a scneario like when table control data wrong then one parameter of the screen should be enabled for the input, i knew that screen-name will not work since it will have always table control fields only when table control gives an error.
How to make the other parameter enable when table control throws an error.
Regards,
Jaya

Hi Gobi,
Thanks for your response, but issue is - how to make other screen fields enable when there was an error in the table control data.
For table control - lets say we will use the code as i mentioned above.i am sure that we cant write the code for field enable in between loop & endloop.
as you said if we right outside the loop-endloop, the module wont be triggered when table control throws an error, because that statement was not there in the loop-endloop.
please let me know if you need any more information on the issue. I hope there is alternative for this in SAP.
Thanks
Jaya

Please tell me the use of ranges , when it should be used

please tell me the use of ranges , when it should be used.

Anytime you have to equate to multiple values in your programs. Say for example, you need to get data for two company codes from a table.
data: it001 type table of t001.
ranges: r_bukrs for t001-bukrs.
r_bukrs-sign = 'I'.
r_bukrs-option = 'EQ'.
r_bukrs-low = '0010'.
append r_bukrs.
r_bukrs-sign = 'I'.
r_bukrs-option = 'EQ'.
r_bukrs-low = '0020'.
append r_bukrs.
select * into table it001 from t001 where bukrs in r_bukrs.
Regards,
Rich Heilman

Why reports are fast when tables are available in local user

Dear All,
I have one report refering ws1,ws2,t1,t2 which are in user "test".
so in my qery of report i will write the query as
select a.code,b.edu,c.dept_name,d.desg_desc
from test.ws1 a,test.ws2 b,test.t1 c,test.t2 d
where a.code = b.code
and a.dept = c.dept
and a.desg = d.desg
The report is logged in by "user123" who is having select grant on all the above 4 tables.
Report runs but takes time.
But if i make the above 4 tables available in "user123" and write the query(removed user name in from clause) as
select a.code,b.edu,c.dept_name,d.desg_desc
from .ws1 a,ws2 b,.t1 c,t2 d
where a.code = b.code
and a.dept = c.dept
and a.desg = d.desg
and then report is logged in by "user123"
Report runs and takes considerably less time.
My understanding is when tables are available in current user it takes less time because it does'nt have to go to other user and search for the tables.
Is it correct or there are some other reasons for it.
Kindly advice
Best Regards,
Devendra

If the tables are owned by a user in the same database then there should be no difference in performance.

How can I get right data in a cell of JTable when table enter editing

how can I get right data in a cell of JTable when table enter editing

how can I get right data in a cell of JTable when table enter editing

How to set setRowKey value when table is populated dynamically

Hi All
I have created a view object using only select statement and displaying all the records in it in the table at page load. Table is SelectMany. Now after selecting some records I press submit button. At the backend logic is executed which prints how many rows selected and the values of the selected rows. Everything works fine till here.
Now when the view object is modified by putting where clause. And the parameter to this where clause is coming from url. When the page is loaded table displays only records based on filter criteria. But the problem begins when I press the submit button. It shows the error: row is null for rowKey:oracle.jbo.Key[AAAQkHAAJAAAACkAAA ]
I have done some research and found that row key is not set for the displayed records. because at the backend when I am printing the values of keys in selectionState.KeySet it prints only null.
This thing happens only when table is populated dynamically through url value.
Can anyone help me how to get the selectionState.Keyset values when table is populated dynamically?

SOLVED:
Actually there is no problem with the rowKeys as I mentioned in the post. What happened was that I was executing the query everytime on page load. Second time when the page is loaded the param value was set to null. So row becomes null but on the other hand I am referring the rows by some selected row keys. so the error that row is null for key...
So now i am storing the param value in managed bean and then referring it in the code.

FBL3N: Document shows open when it should show cleared.

Hello everyone,
I have a GR document in FBL3N showing as an open item, when it should show as cleared.
I went into ME2N and checked the GR/IR history on the scheduling agreement. ME2N shows an IR has been assigned to the GR. I went in to MIRO and I see the same thing under the invoice display.
However, when I go into FBL3N the GR is showing open, not cleared.
Does anyone know why this would happen? Also, any suggestions on how to fix it?
Thanks in advance for all your help.
Rhonda

Hello Ravi,
It appears that my issue has to do with point #3 in your above reply.
Here are the components I am working with:
Item #1: Is goods receipt (WE document type) made on 07/15/2010.
Item #2: Is an incoming invoice (RE document type) received on 07/20/2010.
Item #3: Is a goods receipt (WE document type) made on 04/22/2010.
When Item #2 came in, we entered it in MIRO and attached Item #1 to the invoice.
F.13 was ran and no errors were found.
If I go into MIRO history and in ME2N, everything looks fine.
Now, when I go into FBL3N and pull up open items, Item #1 shows open. When I select to see cleared items, Item #2 and Item #3 are showing cleared.
So, it looks like that even though we assigned item #1 to Item #2 in MIRO, FBL3N is showing as though we assigned Item #3 to Item #2. This is why I think your point #3 is the issue I am having. Item #3 is an earlier receipt that has not been invoiced.
Here is another twist: If I go into MIRO and enter another invoice, Item #3 still shows as an open item that can be assigned to an invoice. Item #1 does not show up in this as an open item.
Okay... hopefully I have not confused you too badly.
It seems as though FBL3N is not pulling the information correctly. Is there away to fix this issue? or is this just something we will have to live with?
Again, thank you so much for your help. I am new to SAP and FICO especially. Thanks for your patience!
Rhonda

Many of my recently uploaded photos are horizontal when they should be vertical, and vice versa. I've corrected all these on my laptop but in my iPad and i Phone photo streams they are still mixed. How can I fix this? Thanks.

Many of my recently uploaded photos are horizontal when they should be vertical, and vice versa. I've corrected all these on my laptop but in my iPad and i Phone photo streams they are still mixed. How can I fix this? Thanks.

Add the corrected ones to your PS - PS contains only what was added to it - changes made are not applied to the PS - you have to re add the updated photos
LN

Why are my deleted emails saving in my 'pictures' as a PDF adobe when they should have been in my deleted email file not saved in my pictures??????

Why are my deleted emails saving in 'my pictures' as a PDF adobe when they should have been in my deleted email file not saved
in my pictures??????

I deleted emails from my windows emails and when I went into my pictures there was all my recently deleted items as pdf adobe files and I cannot right click and delete. But why would my deleted emails be going to my pictures in the first place. So i think it must be in how the adobe program is set up and need to know how to change the settings so my deleted emails are not sent to my pictures.I do not know what other details you would require?

HT201407 why does my replacement iphone 4s say that is it verison when it should be sprint?

why does my replacement iphone 4s say that is it a verison when it should say sprint? also was i supposed to be given another SIM card for my iphone?

sounds like some one made a mistake

I currently have a mac osx, and my CC keeps coming saying its expired, when it should be running the CS6 design standard. So how do I get my platform to use the CS6 as my default instead of the CC one.

I currently have a mac osx, and my CC keeps coming saying its expired, when it should be running the CS6 design standard. So how do I get my platform to use the CS6 as my default instead of the CC one.

Sign in, activation, or connection errors | CS5.5 and later
And you can change the default program for a file type under File --> Info.
Mylenium

Shuffle light shows red when it should show green.

Shuffle light shows red when it should show green. For example, when it's fully charged, the light shows red instead of showing green. When you play a song, the light blink in red too.

Are you sure the 2nd gen shuffle you have is a REAL Apple shuffle and NOT a
FAKE?
LED colors and functions are an indication it a FAKE...

Why does it say rogers 3g on my ipad when it should say rogers 4g?

why does it say rogers 3g on my ipad when it should say rogers 4g

You may be in an area where Rogers doesn't yet have 4G. If so, the iPad will drop back to 3G and will display that to let you know you're running on the older network.

When tables should be analyzed

Similar Messages

Maybe you are looking for