Buffer History

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# Buffer History

This function can be used to display the Adabas Fastpath buffer history information that has been recorded in the Adabas Fastpath configuration file either

- automatically (see the Adabas Fastpath Log Parameter) or

- by using the log function of Adabas Fastpath Special Services.

If history logs are present for more than one buffer, selecting option code `3` from the main menu or entering the direct command 3 from the command line displays the following screen:

    10:22:42     ***** A D A B A S   FASTPATH SERVICES v.r.s *****      2025-10-25
                              -  Buffer History  -                       F13000MA

                   Please mark to select Buffer for History Display

                               _   AFP17004   Global
                               _   A8P17004   Global
                               _   A8P17013   Global

     Command ==>

    Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
          Help        Exit                    Top                           Menu

#### Buffer History Selection

Mark the buffer for which history information is to be provided. The following Buffer History Available screen appears:

Note
This is the first screen displayed if history logs exist for only one buffer.

    10:24:38     ***** A D A B A S   FASTPATH SERVICES v.r.s *****      2025-10-25
                  -  Buffer History Available for Global A8P17004  -     F13100MA

           Buffer   <---Logged at--->    <-------------Optimization--------------->
     Sel   Session  Date        Time                        Attempts      Optimized

     __  104        Oct 18,2025 13:37    Direct-access           105             90
                                            Read-ahead
     __  104        Oct 18,2025 14:37    Direct-access           105             90
                                            Read-ahead
     __  104        Oct 18,2025 15:14 E  Direct-access          1039            593
                                            Read-ahead           462            322
     __  105        Oct 18,2025 15:17 E  Direct-access
                                            Read-ahead             5              2
     __  106        Oct 18,2025 16:17    Direct-access
                                            Read-ahead             6              2
     __  106        Oct 18,2025 17:17    Direct-access
                                            Read-ahead             6              2
     Select using S or an SS pair, Purge using P or a PP pair.
       Position to: Oct 18,2025

     Command ==>

    Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
          Help        Exit              Reset Top   Next                    Menu

#### Buffer History

This screen displays a two-line summary for each log record of the selected (or default) buffer. The summary includes the following information:

Column | Description
--- | ---
Sel | The following option codes can be used to process one or more lines (records) of the log: `s`: display details for one log record. `ss`: display the difference in statistics between a pair of log records. `p`: purge a single log record `pp`: purge from the first to the last marked log records You must enter the options `ss` `pp` in pairs. The second element of the pair need not be on the same screen but must be within the same buffer session. Use PF6 to clear all entries in the Select column.
Buffer Session | The buffer session number. Certain operations cannot be performed across sessions.
Logged at Date/Time | The date and time the log was recorded.
E M | E indicates end-of-job. M indicates a special log request using the function Special Services.
Direct Access | The number of attempted and successful direct access optimizations for each logging period.
Read-Ahead | The number of attempted and successful read-ahead optimizations for each logging period.

Use PF8 to display the next page of log records.

If option code `ss` is marked for a pair of records, the following History Interval screen appears. This screen displays the statistics for the time interval specified in the screen heading.

    16:24:40     ***** A D A B A S   FASTPATH SERVICES v.r.s *****      2025-03-07
     History Interval -         Jan 13,2025 14:34 to 15:06                 F13110MA

       Name: A8P17004                              SVC:  254  DB:  17004
       Dataspace:                                  Buffer Status : Buffer Stopped
       Started:   Jan 13,2025   at: 12:34          Ave Memory Val: 1245
       Address:   00001000 Size(k): 1023           Session Number: 2785

     ------------------------------ Buffer Statistics -----------------------------

        Access Type               Attempts  (98%)    <----------Successes  (99%)

        Read-ahead:                     13   (0%)                       7  (53%)
        Direct:                     54,816  (98%)                  54,797  (99%)
        RCs:                             1   (0%)                       1   (0%)
        Others:                        594   (2%)

        Total:                      55,424 (100%)                  54,805  (98%)
     ------------------------------------------------------------------------------

     Command ==>

    Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
          Help        Exit              Excl  Gen   Buff  Parm              Menu

#### History Interval Logs

The information contained on this screen is exactly like the General Information screen available directly from this screen by pressing PF7. The excluded command analysis, buffer memory and parameter screens can also be invoked by pressing PF6, PF8, and PF9, respectively. All of these screens are described in the section Buffer Information.

If, on the Buffer History screen, you marked a record with an `s` instead of marking a pair, the following screen will appear displaying the statistics at the time the history log was recorded:

    16:25:31     ***** A D A B A S   FASTPATH SERVICES v.r.s *****      2025-03-07
     Buffer History - Logged    Jan 13,2025 17:32                          F13110MA

       Name: A8P17004                              SVC:  254  DB:  17004
       Dataspace:                                  Buffer Status : Active
       Started:   Jan 13,2025   at: 16:32          Ave Memory Val:
       Address:   00001000 Size(k): 1023           Session Number: 2787

     ------------------------------ Buffer Statistics -----------------------------

        Access Type               Attempts   (4%)    <----------Successes  (45%)

        Read-ahead:                     22   (2%)                      12  (54%)
        Direct:                         20   (2%)                       5  (25%)
        RCs:                             4   (0%)                       4  (20%)
        Others:                        722  (96%)

        Total:                         768 (100%)                      21   (2%)
     ------------------------------------------------------------------------------

     Command ==>

    Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
          Help        Exit        Next  Excl  Gen   Buff  Parm  ZNext       Menu

#### Buffer History

This screen displays the details for a single log record. PF keys can be used to display the next sequential log record until the end of session is found:

PF Key | Displays...
--- | ---
PF5 Next | The statistics from the current log record.
PF10 Next | The difference between the current and previous log records. The effect of this function varies depending on the type of information being displayed. This key can be used to skip from one statistics time slice to the next showing the statistics achieved in that time slice (taking the difference between one time slice and the next rather than simply displaying the details of each time slice).

Other PF keys provide direct access to the Excluded Command Analysis, General Information, Buffer Memory, and Parameter screens, which are described in the Buffer Information section.