Managing file and table size with FILEMGMT

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File sizing overview

FILEMGMT calculates Model 204 file size by adding up the sizes of the tables within the file. The sizes of the tables are calculated by evaluating field, record, and procedure definitions.

To calculate the size of... FILEMGMT uses...
Table A All the field definitions linked to the file entry.
Table B, Table C, Table D, and Table E Only field definitions linked to record definitions.

If there are no field and record definitions, Table A, B, C, D, and E sizes are based on the number of records defined for the file in the FILE entry. The value would have originated from a field entry documented in an earlier release of Dictionary/204.

If the value for the number of records is null, default table sizes for A, B, C, and E are used.

To calculate Table D size when the number of records is null, FILEMGMT:

  1. Examines the STORED IN links to the file to find the current number of procedures in the file.
  2. Requests information on the File Definition-Procedure screen about the number of procedures you expect to store in the file. FILEMGMT uses the higher of the two numbers to calculate Table D size.

Sizing a new file

Summary: Use the File Size Definition screen to size your files. You must size each file before you can execute a CREATE command to complete the file creation.

Prerequisite: Before specifying the file sizes, you should have read the File Table Size Management chapter.

  1. Display the following File Size Definition screen with one of the following methods:
  2. Select the FILE Maintenance Size function (number 6) from the primary screen.
  3. Press the PF9 (SIZe) key from any of the FILEMGMT screens that support the SIZe command.

    FILEMGMT File Size Definition Screen FILENAME: VEHICLES Inactive FICREATE: 7.1 FILEORG: Hashed Order PAGESZ: 6184 ASIZE: 3 BSIZE: 57 DSIZE: 4 XSIZE: 0 PROCS ------------ ------------ ------------ ------------ ---------- ASTRPPG: 511 BRECPPG: 233 DRESERVE: 15 % XRECPPG: 0 CUR: 0 ATRPG: 1 BRESERVE: 29 PDSIZE: 1 XRESERVE: 0 EXP: 0 FVFPG: 1 RECS: 11000 PDSTRPPG:128 RECRDOPT: 0 AVPG: 1 MVFPG: 1 DPGSRES: 2 CSIZE: 1 ESIZE: 0 FREESIZE: Total Space Pages: 73 DDname Dataset Name ( 1 of 3 ) Device Trks/Blks USER5XXX MMUUSER5.USER5XXX 3390 10 ________ ____________________________________ ________ __________ ________ ____________________________________ ________ __________ ===> 1=HELp 2=RECords 3=QUIt 4=FIElds 5= 6=COMmands 7= 8=FORward 9=SIZe 10=FILe 11= 12=END

    The File Size Definition Screen displays the following read-only values:.

Field Value
Filename The name of the file that you entered on the primary screen, and indicates whether the file is Active or Inactive.
FICREATE Model 204 version number for the file you are creating. FILEMGMT uses this value to calculate the file size and validate certain Model 204 features.
FILEORG The file organization that you entered on the File Definition - Organization screen.
ASIZE The sum of the ATRPG, FVFPG, and MVFPG parameters. You cannot change this parameter. The default is 3.
RECS The number of records in the file.
CUR The number of procedures defined in the procedure directory.
EHIGHPG The highest page in Table E currently in use.[!!??? does this appear?]
FREESIZE

The number of unassigned pages in the file. You cannot change this value.

For a file in the process of being created or recreated, FREESIZE is not determined; it is left null. When CREATE or RECREATE is executed, the value is filled in appropriately.
TOTAL SPACE Pages The total number of pages used by the file.
  1. For the PAGESZ parameter, specify the page size (physical record length) of the file. For an active file, PAGESZ must correspond to the Model 204 PAGESZ parameter. Valid values are:

    3368 3624 6184 7208

    The default is 6184.

  2. Enter values for the Table A parameters as shown in the following table.

    ASIZE is the sum of the ATRPG, FVFPG, and MVFPG parameters. You cannot change this parameter. The default is 3.

Field Entry
ASTRPPG

The number of Table A strings per page.

Valid values are 1-4000. ASTRPPG*ATRPG cannot exceed 4000. The default is 400.

ATRPG

The number of Table A pages for field names.

Valid values are 1-4000. The default is 1.

FVFPG The number of Table A pages for CODED values of FEW-VALUED fields. Valid values are 1-65535. The default is 1.
MVFPG The number of Table A pages for CODED values of MANY-VALUED fields. Valid values are 1-65535. The default is 1.
  1. Enter values for the Table B parameters as shown in the following table.
    Field Entry
    BSIZE

    The number of pages in Table B of the file.

    BSIZE*BRECPPG cannot exceed 16777216. Valid values are 1 - 16777216. The default is 5. BSIZE cannot exceed 16*(PAGESZ-40) for pre-9.0 RDFS files.

    BRECPPG

    The maximum number of records per Table B pages.

    Valid values are 1 - 1227. The default is 256.

    BRESERVE

    The number of bytes reserved for expanding records stored on Table B pages.

    BRESERVE cannot exceed PAGESZ-40. The default is 17. It should usually be the average weighted record length.

    RECORDS For an existing file, FILEMGMT displays the number of records in the file. You cannot change the value.
    BREUSE

    If your file is of type Unordered, enter a value for BREUSE. The value is specified as a percentage of space on a page; it determines which pages can hold another record.

    When used for storing another record, the page must have the following minimum bytes of free space:

    (usable page size - BRESERVE)*BREUSE + BRESERVE

    Usable page size is the size of the page minus overhead. The default is 20.
  2. In the Table C parameter, CSIZE, enter the number of pages in Table C of the file. Valid values are 1-16777216; for pre-8.1 files, 1-65536. The default is 1.
  3. Enter values for the Table D parameters as shown in the following table:.
    Field Entry
    DSIZE

    The number of pages in Table D of the file.

    Valid values are 1-16777216; for pre-8.1 files, 1-65536. The value should not be less than the value of DPGSUSED plus DPGSRES or you cannot store index records or found sets; it cannot be greater than the current value of FREESIZE. The default is 15.

    DRESERVE The percentage of space in a Table D page reserved for expansion. DRESERVE applies only to inversion pages. Valid values are 0-100. The default is 15.
    PDSIZE The number of contiguous pages in the procedure directory. Valid values are 1-255. PDSIZE/PDSTRPPG must be greater than 0 if the number of expected procedures is greater than 0. The default is 3.
    PDSTRPPG The maximum number of procedure entries per directory page. Valid values are 1-256. The default is 128.
    DPGSRES

    The number of pages in Table D held in reserve. The file is marked full when the first of the DPGSRES pages is used, but transaction backout processing is allowed to continue.

    Valid values are 1-32767. DPGSRES must be less than the value of DSIZE. The default is DSIZE/50 + 2; if DSIZE/50 + 2 is greater than 40, the default is 40.
  4. Enter values for the Table E parameter.
    Prompt Response
    ESIZE Specify the number of pages in Table E of the file. Valid values are 0-1,073,741,823. The default value is 0.

    EHIGHPG shows the highest page in Table E currently in use. You cannot change this value.

  5. Enter values for the procedure parameter:
    • For EXP, specify the number of procedures that you expect to store in the file. Valid values are 0 through the number of pages allowed in Table D, and null. The default is null.
    • Values for CUR (procedures currently defined in the procedure directory) and AVGP (expected average number of pages of the procedures stored in the file) are displayed once the file has been created. [!!! is this correct???]
  6. If your file is of type Sorted, fill in the Sorted parameters:
    Prompt Response
    BEXTOVFL The number of extra overflow areas. The parameter must be greater than 1. The default is null.
    BPGPOVFL The number of Table B pages per overflow area.Valid values are 1-32767. The default is null.
    BPGPMSTR The number of Table B pages per master area. Valid values are 1-32767. The default is null.
  7. Enter the names of the data sets in which the file is stored. (See ...)

    The DDname field displays the names of the currently defined data sets in which the file is stored. The data set names provide links to the physical file; they must be entered in order for FILEMGMT to create the file.

    Scroll to the bottom of the list and add new DDnames up to the 100 data sets per file maximum.

    A DDname must:

  • Have 1-8 characters (letters and/or numbers) and not contain any special characters
  • Begin with a letter
  • Not begin with the characters SYS, CCA, OUT, or TAPE

    The list of DDnames must contain one DDname that is identical to the actual file name. For new files created through FILEMGMT, this is the first DDname, which is added when the file is created.

  1. Enter the Dataset Names corresponding to the data sets.

    Dataset Name displays the data set name associated with the DDname on the same line. If needed, change a data set name by typing over it. Or scroll to the bottom of the list and add new data set names.

    The data set name cannot exceed 44 characters. Valid characters are:

A to Z (0 to 9) + = #

As you move the cursor over the data set names, FILEMGMT changes the number displayed to the right of the Dataset Name heading. The number indicates the relative number of the data set out of the total number of lines in the list. ("1 of 2" in the above screen indicates that the cursor is on the first of two lines.)

You can enter FORward or BACkward and the relative data set number to scroll to the corresponding line in the list. You can scroll forward up to 100 lines, which corresponds to FILEMGMT's limit for data sets per file.

  1. Enter one or more device names.
    • For Device, FILEMGMT displays the device name currently associated with the DDname on this line.

You can change a device name by typing over it. Or scroll to the bottom of the list and add new device names.

The device name can be any of the following:

2311 2314 3330 3340 3350 3370 3375 3380 3390 9335 2305-2

  1. Change the the number of tracks or blocks per data set as needed.

    Trks/Blks is the number of tracks or blocks allocated to a data set. FILEMGMT calculates this number if you size the file by pressing the PF9 (SIZe) key.

  • If your file resides in one data set, leave the Trks/Blks value as is.
  • If your file resides in more than one data set, recalculate the Trks/Blks value in order to allocate the tracks/blocks among all the data sets that contain the file. Note that the value FILEMGMT provides refers to total number of pages, and not to tracks/blocks.
  • You can change the value by typing over it or scroll to the bottom of the list and add new values.
  • Calculate the size of the Model 204 file by pressing the PF9 (SIZe) key. FILEMGMT calculates the parameters and displays them on the File Size Definition screen.
  • Store the values you entered by pressing any of the following function keys or typing a command name at the prompt (===>) and pressing Enter.
    Key Command Meaning
    PF2 RECords Completes the sizing operation. Proceeds to the Record Name List screen in DEFINE mode. This screen lists the records defined for the file.
    PF4 FIElds Completes the sizing operation. Proceeds to the Field Name List screen in DEFINE mode. This screen lists the fields defined for the file.
    PF6 COMmands Completes the sizing operation. Proceeds to the Execute Commands screen. This screen displays the staged commands that were generated for the file and allows you to select the commands you want to execute.
    PF10 FILe Completes the sizing operation. For a new file, proceeds to the File Definition - Organization screen.
    PF12 END Completes the sizing operation. Exits from the File Size Definition screen and returns to the previous screen.

    Results:

    The action completes the sizing operation. If the file was staged with a "sizing required" status (see "Execute Commands Screen"), you can now execute the command for the file on the Execute Commands screen.

Note

The WGTD RECORD LENGTH attribute for the file is set equal to the file's average record length (weighted by number of occurrences in the file) once you complete the file sizing.

Sizing an existing file

Summary: Use the File Size Definition screen to size your files. You must size each file before you can execute a CREATE command to complete the file creation.

Prerequisite: Before specifying the file sizes, you should have read the File Table Size Management chapter.

Display the following File Size Definition screen with one of the following methods:

  • Select the FILE Maintenance Size function (number 6) from the primary screen.
  • Press the PF9 (SIZe) key from any of the FILEMGMT screens that support the SIZe command.

    FILEMGMT File Size Definition Screen FILENAME: VEHICLES Inactive FICREATE: 7.1 FILEORG: Hashed Order PAGESZ: 6184 ASIZE: 3 BSIZE: 57 DSIZE: 4 XSIZE: 0 PROCS ------------ ------------ ------------ ------------ ---------- ASTRPPG: 511 BRECPPG: 233 DRESERVE: 15 % XRECPPG: 0 CUR: 0 ATRPG: 1 BRESERVE: 29 PDSIZE: 1 XRESERVE: 0 EXP: 0 FVFPG: 1 RECS: 11000 PDSTRPPG:128 RECRDOPT: 0 AVPG: 1 MVFPG: 1 DPGSRES: 2 CSIZE: 1 ESIZE: 0 FREESIZE: Total Space Pages: 73 DDname Dataset Name ( 1 of 3 ) Device Trks/Blks USER5XXX MMUUSER5.USER5XXX 3390 10 ________ ____________________________________ ________ __________ ________ ____________________________________ ________ __________ ===> 1=HELp 2=RECords 3=QUIt 4=FIElds 5= 6=COMmands 7= 8=FORward 9=SIZe 10=FILe 11= 12=END

Use the File Size Definition screen to size your files. A CREATE command cannot be executed for a file until the file is sized on this screen.

The screen displays the values of file size parameters that have been specified on previous screens or calculated by FILEMGMT. Some of these parameters can be changed for both new and existing files. Some can be changed only for new files. Others can be viewed but not changed.

The screen provides PF key support to facilitate the sizing operation:

  • To calculate the size of the Model 204 file or to recalculate the size if you change file size parameters, press the PF9 (SIZe) key. FILEMGMT calculates the parameters and displays them on the File Size Definition screen.
  • If you change a resettable parameter (for example, BRESERVE) for an existing file, FILEMGMT stages the file for RESET, provided that the file is not already staged for any other command and does not need to be increased, decreased, or recreated.
  • If you change a non-resettable parameter (for example, ASIZE) for an existing file, FILEMGMT asks if you want to stage the file for RECREATE.
  • To compare the values of parameters whose values have changed as a result of a PF9 sizing operation, press the PF11 (PARameters) key. The action displays the new and previous values on the File Size Parameters screen. You can return to the File Size Definition screen and restore a previous value if you do not want the new value for the file.
  • To store the values specified on this screen, press any of the following function keys:
    PF key Command
    PF2 RECord
    PF4 FIElds
    PF6 COMmands
    PF10 FILe
    PF12 END

    The action completes the sizing operation. If the file was staged with a "sizing required" status (see "Execute Commands Screen"), you can now execute the command for the file on the Execute Commands screen.

  • To recreate the file in order to change parameters that cannot be reset, press the PF5 (RCReate) key. The action stages the file for RECREATE and preserves any previously staged commands in the RECREATE version.

You can use the File Size Definition screen to view information about the data sets in which the file is stored, and to add or change data sets. The data set names provide links to the physical file; they must be entered in order for FILEMGMT to create the file. FILEMGMT displays the data sets in a scrollable list.

Note

The WGTD RECORD LENGTH attribute for the file is set equal to the file's average record length (weighted by number of occurrences in the file) once you complete the file sizing.

Steps

  1. Change the PAGESZ parameter as needed.
  2. Change the editable Table B parameters as needed:
    Parameter Description
    BSIZE

    The number of pages in Table B of the file. For an existing file, BSIZE cannot be changed if the file is hashed.

    BSIZE*BRECPPG cannot exceed 16777216. Valid values are 1 - 16777216. The default is 5. BSIZE cannot exceed 16*(PAGESZ-40) for pre-9.0 RDFS files.

    BRESERVE

    Specify the number of bytes reserved for expanding records stored on Table B pages.

    BRESERVE cannot exceed PAGESZ-40. The default is 17. It should usually be the average weighted record length.

    BREUSE

    For an unordered file only. Specified as a percentage of space on a page; it determines which pages can hold another record.

    When used for storing another record, the page must have the following minimum bytes of free space:

    (usable page size - BRESERVE)*BREUSE + BRESERVE

    Usable page size is the size of the page minus overhead. The default is 20.
  3. Change the editable Table D parameters as needed:
    Parameter Description
    DSIZE

    Specify the number of pages in Table D of the file.

    Valid values are 1-16777216; for pre-8.1 files, 1-65536. The value should not be less than the value of DPGSUSED plus DPGSRES or you cannot store index records or found sets; it cannot be greater than the current value of FREESIZE. The default is 15.

    DRESERVE

    Specify the percentage of space in a Table D page reserved for expansion. DRESERVE applies only to inversion pages.

    Valid values are 0-100. The default is 15.

    DPGSRES

    The number of pages in Table D held in reserve. The file is marked full when the first of the DPGSRES pages is used, but transaction backout processing is allowed to continue. For an existing file, you can change this parameter on the Parameter Reset screen.

    Valid values are 1-32767. DPGSRES must be less than the value of DSIZE. The default is DSIZE/50 + 2; if DSIZE/50 + 2 is greater than 40, the default is 40.
  4. Change the editable Table E parameters as needed:
    Parameter Description
    ESIZE Specify the number of pages in Table E of the file. Valid values are 0-1,073,741,823. The default value is 0.
    EHIGHPG This is the highest page in Table E currently in use.
  5. Change the XSIZE parameter as needed: [!!NEW - NEED DEFINITION!!!]
  6. In the PROCS section, change the editable procedure parameters as needed:
    Parameter Description
    EXP (Expected) The number of procedures that you expect to store in the file. Valid values are 0 through the number of pages allowed in Table D, and null. The default is null.
    AVPG (Avg Pag) The expected average number of pages of the procedures stored in the file. The default is 1.
  7. Change the editable dataset parameters as needed:
    Parameter Description
    Dataset Name

    The data set name associated with the DDname on this line.

    You can change a data set name by typing over it. The data set name cannot exceed 44 characters. Valid characters are:

    A to Z (0 to 9) + = #

    As you move the cursor over the data set names, FILEMGMT changes the number displayed to the right of the Dataset Name heading. The number indicates the relative number of the data set out of the total number of lines in the list. ("1 of 2" in the above screen indicates that the cursor is on the first of two lines.)

    You can enter FORward or BACkward and the relative data set number to scroll to the corresponding line in the list. You can scroll forward up to 100 lines, which corresponds to FILEMGMT's limit for data sets per file.

    Device

    FILEMGMT displays the device name currently associated with the DDname on this line.

    You can change a device name by typing over it. The device name can be any of the following:

    2311 2314 3330 3340 3350 3370 3375 3380 3390 9335 2305-2
    Trks/Blks

    FILEMGMT calculates the number of tracks or blocks allocated to a data set if you size the file by pressing the PF9 (SIZe) key. The number is valid for Model 204 files that reside in one data set.

    If your file resides in more than one data set:

    • Recalculate the Trks/Blks value in order to allocate the tracks/blocks among all the data sets that contain the file.
    • Note that the value FILEMGMT provides refers to total number of pages, and not to tracks/blocks.
    • You can change the value by typing over it. You can scroll to the bottom of the list and add new values.
  8. Store the values you entered by pressing any of the following function keys or typing a command name at the prompt (===>) and pressing Enter.
    Key Command Meaning
    PF2 RECords Completes the sizing operation. Proceeds to the Record Name List screen in DEFINE mode. This screen lists the records defined for the file.
    PF4 FIElds Completes the sizing operation. Proceeds to the Field Name List screen in DEFINE mode. This screen lists the fields defined for the file.
    PF5 RCReate

    Stages an existing file for the RECREATE command. Stages its fields, records, and field groups for the DEFINE command. Incorporates existing RENAME and DELETE commands in the recreated version.

    The staged file has the values entered on the File Size Definition screen; you can change the values and restage the file if you choose.

    PF6 COMmands Completes the sizing operation. Proceeds to the Execute Commands screen. This screen displays the staged commands that were generated for the file and allows you to select the commands you want to execute.
    PF9 SIZe Calculates the file size, based on the parameter values for the file and its fields and records. The values are displayed on the File Size Definition screen.
    PF10 FILe Completes the sizing operation. Proceeds to the first of the File Parameter Reset screens.
    PF11 PARameters Proceeds to the File Size Parameters screen. This screen displays the file size parameters that were changed for an existing file as a result of pressing PF9.
    PF12 END Completes the sizing operation. Exits from the File Size Definition screen and returns to the previous screen.

    Results:

    The action completes the sizing operation. If the file was staged with a "sizing required" status (see "Execute Commands Screen"), you can now execute the command for the file on the Execute Commands screen.

To issue a command, press a PF key or type a command name at the prompt (===>) and press Enter.

After you have left the File Size Definition screen with PF2, PF4, PR6, PF10, PF12, or their corresponding commands, an existing file is staged for the RESET command if all of the following are true:

  • One or more parameter values have changed
  • File does not need to be increased, decreased, or recreated.

File is not already staged for a file command (for example, INCREASE or SECURE).

Viewing changes to file size parameters

To compare the values of parameters whose values have changed as a result of a PF9 sizing operation, press the PF11 (PARameters) key. The action displays the new and previous values on the File Size Parameters screen. You can return to the File Size Definition screen and restore a previous value if you do not want the new value for the file.

  1. Press the PF11 (PARameters) key from the File Size Definition screen to display the File Size Parameters screen.

 

FILEMGMT File Size Parameters Filename: ABC Inactive Parameter New Size Value Original Value BSIZE 1 2 ===> 1=HELp 2= 3=QUIt 4= 5= 6= 7= 8= 9= 10= 11= 12=

The File Size Parameters screen compares the new values of file size parameters with their original values.

A file size parameter is displayed on this screen if:

  • You requested that an existing file be sized by pressing PF9 on the File Size Definition screen.
  • FILEMGMT calculated a different value for the parameter as a result of changes you made to file size parameters. The new value is the value produced by the calculation; the original value is the value of the parameter before the calculation.

If the new value of a non-resettable file parameter is larger than the original value, FILEMGMT advises you to press PF5 to stage the file for a RECREATE.

FILEMGMT displays the following information.

Field Meaning
Filename Name of the file that you entered on the primary screen. Also indicates whether the file is Active or Inactive.
Parameter Names of Model 204 file size parameters that were changed on the File Size Definition screen.
New Size Value New value of the parameter shown on this line, as calculated on the File Size Definition screen.
Original Value Original value of the parameter shown on this line, before any changes were made on the File Size Definition screen.

Resizing Files

You use the File Increase/Decrease screen to change the values of the Model 204 parameters that determine the sizes of Table B, Table D, and Table E. Based on the values you enter on this screen, FILEMGMT stages the file for the INCREASE or DECREASE command. If you add data set names, FILEMGMT stages the file for the INC DSN (increase data set name) command.

The Increase/Decrease function calculates table sizes for existing files. The Size function calculates table sizes for new files.

You can use the File Increase/Decrease screen to view information about the data sets that contain the file and to add or change data sets. Data set names provide links to the physical file and are required in order to create the file. FILEMGMT displays the data sets in a scrollable list.

The cursor is initially positioned at the first input prompt. For private and semipublic files, the first prompt is "Password". For public files, the first prompt is BSIZE.

Tables A and C

After a file has been created, you cannot change the sizes of Tables A and/or C without recreating the file and reloading all the data. For this reason, the default size of ATRPG, CSIZE, FVFPG, and MVFPG is generous to allow for growth.

Increasing Tables B, D, E, and X

When you want to increase the size of Tables B, D, E, and X, the space comes from pages in the free space, which is determined by the FREESIZE parameter. Free space is made available when you:

  • Create the file

    Tables B, D, and X can be increased in size automatically using the Automatic Increase feature (BAUTOINC, DAUTOINC, and XAUTOINC).

  • Put released space back into free space

    The size of Table B (except for hash key files), D, E, or X can be changed easily with the INCREASE and DECREASE commands.

Increasing and decreasing file size

  1. On the primary FILEMGMT screen, enter the name of an existing file beside the FIlename: prompt at the top of the screen.
  2. Tab to the File section and enter a number beside File:
    • 7 for INCREASE
    • 8 for DECREASE

      and press Enter. The File Increase/Decrease Screen appears.

FILEMGMT File Increase/Decrease Filename: VEHICLES Inactive Fileorg: Hashed Order TOTAL SPACE Pages: 73 New Sizes, New Sizes BSIZE:, 57 57 DSIZE: 4 4 BHIGHPG: DPGSUSED: ESIZE: 0 0 XSIZE: EHIGHPG: XHIGHPG: FREESIZE: 5 5 DDname Dataset Name ( 1 OF 5 ) Device Trks/Blks VEHICLES PSEDMNT.VEHICLES______________________ ________ _________ ________ ______________________________________ ________ _________ ________ ______________________________________ ________ _________ ________ ______________________________________ ________ _________ ________ ______________________________________ ________ _________ ===> 1=HELp 2= 3=QUIt 4= 5= 6=COMmands 7= 8=FORward 9= 10= 11= 12=END

 

  1. Enter the following information.
    Prompt Response
    Filename FILEMGMT displays the name of the file that you entered on the primary screen, and indicates whether the file is Active or Inactive.
    Password For active files, FILEMGMT displays this prompt if the file requires a password. Type a valid password for the file (1-10 characters containing no spaces, commas, or colons).
    TOTAL SPACE FILEMGMT displays the total number of pages used by the file. The number is based on the values of the parameters shown on the screen.
    BSIZE

    FILEMGMT displays the number of pages in Table B of the file. You can change the number by typing a new value between 1 and the maximum valid value. You cannot change the current value for hashed files.

    The maximum valid value is the current value of BSIZE plus the current value of FREESIZE. BSIZE cannot exceed 16777216 (or 98304 for RDFS files). You cannot specify a value less than BHIGHPG for entry order or sorted files.

    BHIGHPG For active files, FILEMGMT displays the number of the highest active Table B page (for entry order and sorted files) or the number of full Table B pages (for hashed files). You cannot change this value.
    DSIZE

    FILEMGMT displays the number of pages in Table D of the file. You can change the number by typing a new value between 3 and the maximum valid value.

    The minimum value must be greater than the value of DPGSUSED plus DPGSRES. The maximum valid value is the current value of DSIZE plus the current value of FREESIZE. DSIZE cannot exceed 16777216.

    Note: If you are increasing the file size without adding a new data set (DDname) to the file, the new value of (BSIZE/DSIZE) minus the old value of (BSIZE/DSIZE) must be equal to or less than FREESIZE.

    DPGSUSED For active files, FILEMGMT displays the number of Table D pages in use. You cannot change this value.
    ESIZE FILEMGMT displays the number of pages in Table E for the file. You can enter a new value between 0 and 1,073,741,823. The minimum value must be greater than the value of EHIGHPG. If ESIZE is non-zero, indicating that Large Object fields may be defined, ESIZE cannot be less than 20.
    EHIGHPG For active files, FILEMGMT displays the highest Table E page. You cannot change this value.
    FREESIZE FILEMGMT displays the number of unassigned pages in the file. You cannot change this value.
    DDname

    FILEMGMT displays the DDnames of the currently displayed data sets. You can scroll to the bottom of the list and add new DDnames. You cannot delete DDnames in an existing file. The DDname must:

    • Have 1-8 characters (letters and/or numbers) and not contain any special characters.
    • Begin with a letter.
    • Not begin with the characters SYS, CCA, OUT, or TAPE

    The first DDname for the file must be identical to the actual file name.

    Dataset Name

    FILEMGMT displays the data set name associated with the DDname on this line.

    You can change a data set name by typing over it. You can scroll to the bottom of the list and add new data set names. You cannot delete data set names in an existing file.

    The data set name cannot exceed 44 characters. Valid characters are:

    A - Z (0 - 9) + = #

    As you move the cursor over the data set names, FILEMGMT changes the number displayed to the right of the Dataset Name heading. The number indicates the relative number of the data set out of the total number of lines in the list. ("1 of 5" in the above screen indicates that the cursor is on the first of five lines.)

    You can enter FORward or BACkward and the relative data set number at the prompt to scroll to the corresponding line in the list. You can scroll forward up to 100 lines, which corresponds to FILEMGMT's limit for data sets per file.

    Device

    FILEMGMT displays the device name currently associated with the DDname on this line.

    You can change a device name by typing over it. You can scroll to the bottom of the list and add new device names. You cannot delete device names in an existing file. The device name can be any of the following:

    2311 2314 3330 3340 3350 3370 3375 3380 3390 9335 2305-2
    Tracks/Blocks

    FILEMGMT displays the number of tracks or blocks allocated for the data set. FILEMGMT calculates the value on the File Size Definition screen.

    You can change the value by typing over it. You can scroll to the bottom of the list and add new values.
  2. Stage the file by issuing one of the following commands:
    • [!!!(To resize the file immediately?)] Press PF6 or enter COM at the prompt to stage the file for INCREASE, DECREASE, or INC DSN and proceed to the Execute Commands screen. This screen displays the staged commands that were generated for the file and allows you to select the commands you want to execute.
    • [!!!(To save the resizing information??)] Press PF12 or enter END at the prompt to stage the file for INCREASE, DECREASE, or INC DSN and return to the primary screen.

 

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