/History ODB tree

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Purpose

The ODB /History tree contains information related to the History System.

Creating the /History tree

The /History ODB tree is created by mlogger.



Example of /History tree

The system created the following /History tree using the /Equipment/INFO tree. The history tags above are derived from the variable Names in the Settings subtree.

[local:pol:S]/History>ls -lr Key name Type #Val Size Last Opn Mode Value


History DIR

   LoggerHistoryChannel        STRING  1     32    24h  0   RWD
   DisableTags                 BOOL    1     4     1h   0   RWD  n
   Display                     DIR
       Default                 DIR
           Trigger rate        DIR
               Variables       STRING  2     64    1h   0   RWD
                                       [0]             System:Trigger per sec.
                                       [1]             System:Trigger kB per sec.
               Time Scale      STRING  1     32    1h   0   RWD  1h
               Factor          FLOAT   2     4     1h   0   RWD
                                       [0]             1
                                       [1]             1
               Offset          FLOAT   2     4     1h   0   RWD
                                       [0]             0
                                       [1]             0
               Timescale       STRING  1     32    1h   0   RWD  1h
               Zero ylow       BOOL    1     4     1h   0   RWD  y
               Show run markersBOOL    1     4     1h   0   RWD  y
               Log axis        BOOL    1     4     24h  0   RWD  n
               Show values     BOOL    1     4     24h  0   RWD  n
               Sort vars       BOOL    1     4     24h  0   RWD  n
               Show old vars   BOOL    1     4     24h  0   RWD  n
               Minimum         FLOAT   1     4     24h  0   RWD  -inf
               Maximum         FLOAT   1     4     24h  0   RWD  inf
   Links                       DIR
       System                  DIR
           Trigger per sec. -> /Equipment/Trigger/Statistics/Events per sec.
                               DOUBLE  1     8     16h  1   RWD  0
           Trigger kB per sec. -> /Equipment/Trigger/Statistics/kBytes per sec.
                               DOUBLE  1     8     16h  1   RWD  0
   Events                      DIR
       101                     STRING  1     7     1h   0   RWD  System
       0                       STRING  1     16    24h  0   RWD  Run transitions
       3                       STRING  1     5     24h  0   RWD  INFO
   Tags                        DIR
       101                     STRING  3     96    1h   0   RWD
                                       [0]             System
                                       [1]             10[1] Trigger per sec.
                                       [2]             10[1] Trigger kB per sec.
       0                       STRING  3     96    1h   0   RWD
                                       [0]             Run transitions
                                       [1]             6[1] State
                                       [2]             6[1] Run number
       3                       STRING  25    96    24h  0   RWD
                                       [0]             INFO
                                       [1]             9[1] Data still buffered
                                       [2]             9[1] Num SIS LNE events
                                       [3]             9[1] LNE count from SIS
                                       [4]             9[1] LNE preset value
                                       [5]             9[1] number of bins
                                       [6]             9[1] data bytes code
                                       [7]             9[1] num enabled channels
                                       [8]             9[1] discard first bin
                                       [9]             9[1] discard first cycle
                                       [10]            9[1] not used
                                       [11]            9[1] Scan type code
                                       [12]            9[1] Number good cycles
                                       [13]            9[1] Number supercycles
                                       [14]            9[1] Cycle num within supercycle
                                       [15]            9[1] Sweep number
                                       [16]            9[1] Num cycles skipped
                                       [17]            9[1] Num cycles histogrammed
                                       [18]            9[1] DAC Increment number
                                       [19]            9[1] DAC Set Value (volts)
                                       [20]            9[1] DAC Readback (volts)
                                       [21]            10[1] SC Sum ch17
                                       [22]            10[1] SC Sum ch18
                                       [23]            10[1] SC Sum ch19
                                       [24]            10[1] SC Sum ch20
   Display Settings            DIR
       Width Gropup            STRING  1     256   24h  0   RWD  Small



Keys in the /History ODB tree

LoggerHistoryChannel

  • Type: STRING
  • Default: "0"

This key in the /History ODB tree selects the channel in the /Logger/History subtree to be used for saving the History data. See also History System. If LoggerHistoryChannel is blank, the first active channel will be used.


DisableTags

  • Type: BOOL
  • Default: "n"

This key is only used for "MIDAS" type history, and is not used by the ODBC or SQLITE history.

Set this key in the /History ODB tree to "y" if reading the history tags directly from the history files. Set to "n" to read the history tags from the ODB. If this key is set to "y" the /History/Tags subdirectory (if present) will be deleted.

See Note1






CreateOldTags

  • Type: BOOL
  • Default: "n"


If this key in the /History ODB tree and set to "y", it will force creation of /History/Tags subtree(s) using the old format. See [[#Note1].

This key is optional and may not be present in recent versions.






MaxDisplayEvents

  • Type: INT
  • Default: 20

This key in the /History ODB tree is used by mhttpd to set the maximum number of events displayed in the history page maybe??






MaxDisplayTags

  • Type: INT
  • Default: 20

This key in the /History ODB tree is used by mhttpd to set the maximum number of tags ??






PerVariableHistory (obsolete)

  • Type: INT
  • Default: "n"

This key in the /History ODB tree is OBSOLETE and should be deleted from the ODB if using a recent version of MIDAS. A message will be printed to this effect.

It has been replaced by PerVariableHistory.





Links subtree

  • Type: DIR

This subtree in the /History ODB tree is created by mlogger. If an equipment named "Trigger" is present, mlogger creates





System subtree

  • Type: DIR

This subtree in the Links subtree is created by mlogger if an equipment named "Trigger" is present.






Trigger per sec.

  • Type: DIR

This link in the System subtree is created by mlogger if an equipment named "Trigger" is present. Trigger per sec. is linked to the key /Equipment/Trigger/Statistics/Events per sec..




Trigger kB per sec.

  • Type: DIR

This link in the System subtree is created by mlogger if an equipment named "Trigger" is present. Trigger kB per sec. is linked to the key /Equipment/Trigger/Statistics/kBytes per sec..






Tags subtree

  • Type: DIR

This subtree in the /History ODB tree is used for private data storage for the "MIDAS" type history, and is not used by the ODBC or SQLITE history.

If MIDAS history is enabled, and the Equipment key /Equipment ODB tree#Log history is set for one or more Equipments, this subtree is created by mlogger. It contains history tags created by mlogger for each equipment set to /Equipment ODB tree#Log history. If the global PerVariableHistory key is set or the PerVariableHistory key in the /Equipment/Settings subtree of that equipment, then tags for that Equipment will be created automatically by mlogger. The names of the tags will be taken from /Equipment/Settings/Names if present, otherwise default tag names will be created.



The contents of the event will then be completely copied into the history files, using the definition of the event as tag names for every element of the event.



Display subtree

  • Type: DIR

This subtree in the /History ODB tree contains parameters used to control the History panels display. It contains a subtree for each defined History panel.






<panel-name> subtree

  • Type: DIR

This subtree in the Display subtree is named for the panel on the mhttpd History page, and contains information to define the contents of this panel. In the example, only one panel is defined, named Default. The Default panel is created when If there is more than one panel defined, there will be other panel subtrees present with different panel names.






Trigger rate subtree

  • Type: DIR






Events subtree

This subtree in the /History tree contains private data storage for the "MIDAS" type history, and is not used by the ODBC or SQLITE history.