What is the use of Multiple source in Logical Table under BMM Layer?

what is the use of Multiple source in Logical Table under BMM Layer?
thanks in advance

Or more generally speaking:
To create a "logical table" consisting of multiple "physical tables"...hence the names. It's the backbone of the whole BI server concept and the way the rpd handles the requests.
I.e.: how would you otherwise proceed for making an analyzable table from SAP, Teradata, Oracle and a flat file with no full change-access to all the data sources?

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    The order of the sources in the logical table(in case of multiple sources) will it affect the query results??

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    OBIEE pick the LTS using this algorithm:
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    2) OBIEE multiply for every LTS all the numbers of elements defined for a specific LTS
    3) OBIEE pick the LTS that has the lower valure (like a cost of access, it picje the most aggregated table)
    4) if there are multiple LTS with the same cost, OBIEE choses the first in order of defiition
    Regards,
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  • Building Views vs Multiple sources as Logical tables

    I am building logical tables that could have many physical sources. Is there any benefit to making a single view and using it as a single source?

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    Always is better to do things in database,for many reasons....
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    2.maintenace....
    My opinion is better to do a final fact table which contains data from all the sources..and use this table as your fact table in the bussiness solution.not view,not many sources.You can make aggregates tables,put indexes and in generall is more simple and it contains all the benefits of a STAR SCHEMA..
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    http://greekoraclebi.blogspot.com/

  • What is the use of  keyword SCAN ABAP-SOURCE

    Hello experts,
    what is the use of scan abap-source. please explain. what is tokens, statements, levels in that.

    Hi
    <b>SCAN</b>
    This statement is for internal use only.
    It cannot be used in application programs.
    <b>SCAN ABAP-SOURCE itab1 ...TOKENS INTO itab2
                           ...STATEMENTS INTO itab3.</b>
    Parts marked with " ..." are interchangeable
    <b>Addition 1</b>
    ... FROM n1
    <b>Addition 2</b>
    ... TO   n2
    Breaks down the source code table itab1 into tokens not from start to finish, but only from line n1 to line n2.
    The additions FROM n1 and TO n2 must, in this order, follow the specification of the source code table itab1.
    When using the start specification n1, use the addition WITHOUT TRMAC to ensure that there are no unnecessary database accesses to the table TRMAC.
    The end specification n2 is treated as "soft", i.e. a statement that begins on a line <= n2, but ends only on a line > n2, is returned completely.
    If the end specification n2 is split in a chain statement, only the split part up to the next comma is returned completely, not the entire chain statement up to the next period.
    Negative line specifications are not allowed and result in a runtime error.
    A line specification of 0 amounts essentially to no specification.
    If n1 number of lines in source code table, the scanner is not called (SY-SUBRC = 2).
    If n1 > n2 and n2 > 0, the scanner is not called (SY-SUBRC = 2).
    <b>
    Addition 3</b>
    ... KEYWORDS FROM itab4
    Does not return all statements, only those specified in the key word table itab4.
    If the key word table is empty (i.e. it contains 0 lines), all the statements are selected.
    The lines of the key word table are treated as a character field.
    To select a Native-SQL-statement or a macro definition, you can specify the pseudo key words EXEC_SQL or DEFINE_MACRO. It makes no difference whether the statements EXEC or DEFINE occur as well. Native SQL statements and macro definitions are returned as one statement (of type E or M even if the expansion of a macro definition results in more than one statement.
    If the key word table contains a blank line, blank statements are also selected.
    <b>Addition 4</b>
    ... LEVELS INTO itab5
    Stores details about each edited source code unit (source code table itab1 itself, expanded include-programs, expanded macro definitions) in the level table itab5.
    Specification of a level table makes sense only with the addition WITH INCLUDES.
    The level table itab5 must have the structure SLEVEL.
    The fields of the structure SLEVEL - and consequently the columns of the level table itab5 have the following meaning:
    TYPE
    Type of source code unit with the following possible values:
    P (Program)
    D (Internal DEFINE macro)
    R (Macro from table TRMAC)
    NAME
    Name of source code unit (name of include program, macro name)
    DEPTH
    Current nesting depth of source code unit (>= 1)
    LEVEL
    Index of superior (i.e. including or calling) source code unit in the level table (>= 1, if DEPTH >= 2, otherwise 0)
    STMNT
    Index of superior (i.e. including or calling) statement in the statement table (>= 1, if DEPTH >= 2, otherwise 0)
    FROM
    Index of first statement of source code unit in the statement table (>= 1)
    TO
    Index of last statement of source code unit in the statement table (>= 1)
    If the source code unit contains include programs or macro calls, the line range [ FROM, TO] in the statement table also covers the statements in subordinate source code units.
    <b>Addition 5</b>
    ...  STRUCTURES INTO itab6
    Details of the construction of the source text table are given in the structure table itab6.
    The structure table itab6 must have the structure SSTRUC.
    The fields in SSTRUC (which are also the columns of structure table itab6) have the following meanings:
    TYPE
    Type of the structure with possible values:
    P (Beginning of the source code)
    R (Subroutine)
    M (Macro, EXEC SQL)
    I (Loop)
    A (Case distinction)
    C (Condition in a case distinction)
    J (Goto command)
    D (Structured declaration)
    E (Event)
    S (Follow-on from simple structured statement)
    STMNT_TYPE
    The statement type of the beginning of the structure. The values are listed in the type pool SCAN in structure SCAN_STRUC_STMNT_TYPE.
    KEY_START
    Flags whether the start of the structure is described semantically ('X' if there is a special statement, otherwise ' ').
    KEY_END
    Flags whether the end of the structure is described semantically ('X' if there is a special statement, otherwise blank).
    STMNT_FROM
    Index of the first statement of the structure in the statement table itab3.
    STMNT_TO
    Index of the last statement of the structure in the statement table itab3.
    Index of the first substructure of the structure in structure table itab6.
    STRUC_TO
    Index of the last substructure of the structure in structure table itab6.
    BACK
    Index of the structure in the structure table itab6 that contains the structure as a substructure (0 if the structure is the root structure of a structure tree).
    <b>Addition 6</b>
    ... OVERFLOW INTO c1
    The addition is only allowed and required if the token table itab2 has the structure STOKEN or STOKEX.
    If a token is too large to be stored in the token table in the field STR, it is placed in the overflow area c1. The offset of the token in the overflow area then lies in the token table in the field OFF1.
    <b>Addition 7</b>
    ... WITH ANALYSIS
    Breaks down each token t = a+b(c) according to the logic of the RSYN key word >ANALY into its three components a, b and c.
    Offset and length of components a, b and c are stored in the fields LEN1, OFF2, LEN2, OFF3, and LEN3 in the token table. (The offset of OFF1 is always 0 and therefore not required.)
    If you specify the addition WITH ANALYSIS, the token table itab2 must have the structure STOKESX, so that the fields LEN1, OFF2, LEN2, OFF3 and LEN3 are available.
    If the token table has the structure STOKEX, you must consider the following:
    If the whole token exists in the token table, the offset specifications are relative to the token start. If the token is in the overflow area c1, the offset specifications are relative to the start of the overflow area.
    <b>Addition 8</b>
    ... WITH COMMENTS
    Returns comments also, with each individual comment representing a token. The system additionally stores entries for each full block of comments in the table itab3, differentiating between comments that occur within statements and those that occur at program level. In itab3, an entry for a comment within a statement always comes before the statement containing the comment.
    <b>Example</b>
    Look at the following program fragment. The preceding numbers are the indexes of the tokens.
    1    * An example  *
    2    * with scattered comments
    6    MOVE
    3    * Inserted comment 1
    7    X
    4    *  Inserted comment 2
    8    TO
    9    Y
    5    * Inserted comment 3
    SCAN then enters the following values for the components TYPE, FROM and TO (in this order from left to right) into itab3.
    'P' 1 2
      'S' 3 5
      'K' 6 9
    If the addition ... WITH COMMENTS is used, the table itab2 must have the line type STOKES or STOKESX.
    <b>Addition 9</b>
    ... WITH INCLUDES
    Also breaks down subordinate source code units (included programs, called macros) into tokens.
    You should normally combine the addition WITH INCLUDES with the addition LEVELS INTO itab5.
    If (at least) one included program does not exist, SY-SUBRC is set to 1 and the relevant INCLUDE statement is flagged in the statement table itab3 by the statement type J (instead of I), but the breakdown process continues. The level table itab5 contains no entry for include-programs that do not exist.
    If you combine WITH INCLUDES with WITHOUT TRMAC , TRMAC-Macros are not expanded because the system does not recognize them as subordinate source code units.
    When macro calls are expanded, no position specifications are available. The corresponding fields in the token table itab2 and the statement table itab3 are then set to 0.
    <b>Addition 10</b>
    ... WITH TYPE-POOLS
    This addition has the same effect as the WITH INCLUDES addition, except that with the former include programs belonging to type groups are broken down into tokens.
    <b>Addition 11</b>
    .. WITH LIST TOKENIZATION
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    <b>Addition 12</b>
    ... WITHOUT TRMAC
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    To avoid unnecessary database accesses to the table TRMAC, you should use the addition WITHOUT TRMAC whenever you assume that the source code to be scanned contains unknown statements. Unknown statements are particularly likely to occur if you use the addition FROM n1, because the scanner does not start at the beginning of the source code, but from a specified point.
    If you use WITHOUT TRMAC with WITH INCLUDES, TRMAC macros are not expanded because the system does not recognize them as subordinate source code units.
    <b>Addition 13</b>
    ... PROGRAM FROM c2
    <b>Addition 14</b>
    ... INCLUDE INTO c3
    <b>Addition 15</b>
    ... MESSAGE INTO c4
    <b>Addition 16</b>
    ... WORD    INTO c5
    <b>Addition 17</b>
    ... LINE    INTO n3
    <b>Addition 18</b>
    ... OFFSET  INTO n4
    The above additions have the same meaning as those for the
    SYNTAX-CHECK: statement: c2 is an input field for a program name to be assigned to the source code, while the fields c3, c4, c5, n3 and n4 are output fields in case an error occurs.
    To be able to analyze errors without modifying programs, use the additions INCLUDE, MESSAGE, WORD, LINE and OFFSET. These provide information about the errors which have occurred.
    <b>Variant 2</b>
    SCAN AND CHECK ABAP-SOURCE itab1 ...RESULT INTO itab2.
    Parts marked with " ..." are interchangeable
    <b>Extras:</b>
    1. ... PROGRAM FROM c1 2. ... INCLUDE INTO c2
    3. ... MESSAGE INTO c3
    4. ... WORD    INTO c4
    5. ... LINE    INTO n1
    6. ... OFFSET  INTO n2
    The syntax of the program in table itab1 is checked. During the check, all of the information from the program, such as statement structures, statements, tokens, data objects, types and do on are placed into the result field. This field must have the type SYSCH_RESULT, which is defined in type group SYSCH. You must therefore declare type group SYSCH in your ABAP-program using a TYPE-POOLS statement.
    &ABAP_ADDITION _1&
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    &ABAP_ADDITION _2&
    ... INCLUDE INTO c1
    &ABAP_ADDITION _3&
    ... MESSAGE INTO c3
    &ABAP_ADDITION _4&
    ... WORD    INTO c4
    &ABAP_ADDITION _5&
    ... LINE    INTO n1
    &ABAP_ADDITION _6&
    ... OFFSET  INTO n2
    The above additions have the same effect as the corresponding additions in the statement SYNTAX-CHECK: c1 is an input field for a program name to be assigned to the source code, the fields c2, c3, c4, n1 and n2 are output fields, used when errors occur.
    To enable you to analyze errors without having to modify the program, you should specify the INCLUDE, MESSAGE, WORD, LINE and OFFSET additions for the information about the error that occurred.
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    T.Code WE30 to create IDoc Type.
    Enter the Object Name, Select Basic Type and click Create Icon
    Select the create new option and enter a description for your basic IDOC type and press enter
    Select the IDoc name and click Create icon
    The system prompts us to enter a segment type and its attributes
    Choose the appropriate values and press enter
    The system transfers the name of the segment type to the IDoc editor.
    Follow these steps to add more number of segments to Parent or as Parent-child relation.
    Save it and go back.
    Go to Edit -> Set Release.
    Message Type:
    Steps in Creating Message Type:
    T.Code WE81.
    change the details from Display mode to Change mode
    After selection, the system will give this message "The table is cross client (See help for further info)". Press enter.
    Click New Entries to create new Message Type.
    Fill details
    Save it and go back.
    Assign Message Type to IDoc Type:
    T.Code WE82
    Change the details from Display mode to change mode.
    After selection, the system will give this message "The table is cross client (See help for further info)". Press enter.
    Click New Entries to create new Message Type.
    Fill details
    Save it and go back.
    <REMOVED BY MODERATOR>
    Edited by: Alvaro Tejada Galindo on Feb 6, 2008 5:10 PM

  • What is the use of variant in the alv report

    hello all,
    what is the use of variant in the alv report

    Hi,
    For Variants
    follow the link:
    http://help.sap.com/search/highlightContent.jsp
    Variants allow you to save sets of input values for programs that you often start with the same selections. You can use them for any programs except subroutine pools (type S).
    Contents
    Variants: Overview
    Initial Screen
    Displaying a Variant Overview
    Creating and Maintaining Variants
    Creating Variants
    Attributes of Variants
    Changing Variants
    Deleting Variants
    Printing Variants
    Variable Values in Variants
    Creating Variables for Date Calculations
    User-specific Selection Variables
    Creating User-specific Variables
    Changing Values Interactively
    Changing Values from the Program
    Fixed Values from Table TVARV
    Creating Table Variables from TVARV
    Changing TVARV entries
    Running a Program with a Variant
    Variants: Overview
    Use
    Whenever you start a program in which selection screens are defined, the system displays a set of input fields for database-specific and program-specific selections. To select a certain set of data, you enter an appropriate range of values.
    For further information about selection screens, see Working with selection screens in the ABAP User's Guide.
    If you often run the same program with the same set of selections (for example, to create a monthly statistical report), you can save the values in a selection set called a variant.
    You can create any number of variants for any program in which selection screens are defined. Variants are assigned exclusively to the program for which they were created.
    You can also use variants to change the appearance of the selection screen by hiding selection criteria. This is particularly useful when you are working with large selection screens on which not all of the fields are relevant.
    Reports, module pools, and function groups may have several selection screens. It is therefore possible to create a variant for more than one selection screen.
    Variants are an interface between the user and the selection screen. They can be used both in dialog and in background mode, although their uses are slightly different.
    Variants in Dialog Mode
    In dialog mode, variants make things easier for the user, since they save him or her from continually having to enter identical values. They can also make the selection screen easier to read, because you can use them to hide input fields. Running an executable program with a variant containing an optimal set of values also reduces the capacity for user error. The optimized database selections speed up the runtime of the program.
    Variants in Background Mode
    Variants are the only method for passing values to a report program in a background job. Therefore, when you run a program in the background, you must use a variant (or SUBMIT... VIA JOB). To avoid you having to create a new variant each time you run the report, ABAP contains a mechanism allowing you to pass variable values to variants. See variable values in variants.
    To ensure that an executable program is always started using a variant, you can specify in the program attributes that the program may only be started in this way.
    Features
    Creation of variants
    Display, change, copy, print, and delete variants
    Use and definition of variables in variants
    Variable date calculation
    User-specific fixed values
    Fixed values in table TVARV
    You access the variant maintenance tool from the initial screen of the ABAP Editor. Enter the name of the program, select Variants in the Sub-objects group box, and then choose Display or Change.
    Functions
    The above screen allows you to:
    Create variants
    Display the variant directory
    Display and change values and attributes
    Copy, delete, and rename variants
    Before creating a new variant for a program, you should check whether you can use or adapt an existing variant instead.
    There are two ways to display variants:
    Position the cursor on the Variant field on the initial screen and press F4. The following dialog box lists all of the available variants:
    Choose Variants ® Directory on the initial screen:
    Creating Variants
    Prerequisites
    You must have defined one or more selection screens for the relevant program. The program may have any type except type S.
    Procedure
    On the initial screen of the ABAP Editor, enter the name of the program for which you want to create a variant, select Variants in the Sub-objects group box, and choose Change.
    On the variant maintenance initial screen, enter the name of the variant you want to create.
    Note the naming convention for variants (see below).
    Choose Create.
    If the program has more than one selection screen, a dialog box appears in which you can assign the variant to one or more screens. The dialog box does not appear if the program only has one selection screen. In this case, the selection screen of the program appears straight away.
    If there is more than one selection screen, select the screens for which you want to create the variant.
    Example:
    If you choose Variant for all selection screens, the variant also applies to any selection screens that you create after creating the variant.
    Otherwise, the variant only supplies values to the selection screens that you select in the list.
    Choose Continue.
    The (first) selection screen of the program appears.
    If your program has more than one selection screen, use the scroll buttons in the left-hand corner of the application toolbar to navigate between them. If you keep scrolling forwards, the Continue button appears on the last selection screen.
    Enter the required selections, including multiple and dynamic selections.
    Choose Continue.
    Result
    When you have finished, an overview screen appears (ABAP: Save Attributes of Variant), on which you can enter the attributes of your variant and save it.
    Note that when you create a new variant, you must enter both values and attributes.
    Names of variants: Names can consist of up to 14 alphanumeric characters. The "% " character is not allowed. If you want the variant to be transported automatically with its program, you must create a system variant. The name of a system variant starts "CUS&" for customers, and "SAP&" for SAP system variants. You can only use the "&" character within this prefix in the name of a system variant. It may not occur in any other context. System variants are administered by the Workbench Organizer. Although you can create and access variants from any client, they are always stored in client "000".
    Creating Variants
    Prerequisites
    You must have defined one or more selection screens for the relevant program. The program may have any type except type S.
    Procedure
    On the initial screen of the ABAP Editor, enter the name of the program for which you want to create a variant, select Variants in the Sub-objects group box, and choose Change.
    On the variant maintenance initial screen, enter the name of the variant you want to create.
    Note the naming convention for variants (see below).
    Choose Create.
    If the program has more than one selection screen, a dialog box appears in which you can assign the variant to one or more screens. The dialog box does not appear if the program only has one selection screen. In this case, the selection screen of the program appears straight away.
    If there is more than one selection screen, select the screens for which you want to create the variant.
    Example:
    If you choose Variant for all selection screens, the variant also applies to any selection screens that you create after creating the variant.
    Otherwise, the variant only supplies values to the selection screens that you select in the list.
    Choose Continue.
    The (first) selection screen of the program appears.
    If your program has more than one selection screen, use the scroll buttons in the left-hand corner of the application toolbar to navigate between them. If you keep scrolling forwards, the Continue button appears on the last selection screen.
    Enter the required selections, including multiple and dynamic selections.
    Choose Continue.
    Result
    When you have finished, an overview screen appears (ABAP: Save Attributes of Variant), on which you can enter the attributes of your variant and save it.
    Note that when you create a new variant, you must enter both values and attributes.
    Names of variants: Names can consist of up to 14 alphanumeric characters. The "% " character is not allowed. If you want the variant to be transported automatically with its program, you must create a system variant. The name of a system variant starts "CUS&" for customers, and "SAP&" for SAP system variants. You can only use the "&" character within this prefix in the name of a system variant. It may not occur in any other context. System variants are administered by the Workbench Organizer. Although you can create and access variants from any client, they are always stored in client "000".
    reward all help full answers

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