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Calculating the Number of Database Objects

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‎2021-06-09 07:10 PM

Calculating the Number of Database Objects

Originally published on Geo SCADA Knowledge Base by Anonymous user | June 10, 2021 04:10 AM

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Query the CDBObject Table


 SELECT COUNT( "Id" ) FROM CDBOBJECT


gives the total number of objects that are not in a template. Objects within templates are abstract objects (not 'real' objects). This number may also be limited by the user's permissions, however logic can be used to get complete object count and memory usage figures because logic runs as a high-level user.

 TYPE   Result:   STRUCT    Count : DINT;   Memory : DINT;   END_STRUCT;  END_TYPE  PROGRAM ObjectCount  VAR   Objects AT %S(SELECT COUNT(*) AS "Count", SUM(MemoryUsage) AS "Memory" FROM CDBObject) : RESULTSET OF Result;   Count AT %M(.ObjectCount.CurrentValue) : DINT;   Memory AT %M(.ObjectMemory.CurrentValue) : DINT;  END_VAR  Count := Objects.Value.Count;   Memory := Objects.Value.Memory;  END_PROGRAM 


The outputs are to internal analog points. Remember to change the Hand Control ranges and FullScale property as necessary so the logic doesn't produce an error when the object or memory count exceeds the maximum ranges allowable.

The memory diagnostics are only a rough guide to memory consumption. They don't account for everything. In the particular case of variables, the memory diagnostic does not extend to include array members.



Use ClearSCADA Server Status Display or Examine Snapshots


The server status item 'Database\Indices\CDBObject\Obj Count' is the total number of objects in the database.

ServerStatusObjCount.PNGServerStatusObjCount.PNGServerStatusObjCount.PNG


This is also contained in the DB_Snapshot log files in the "Obj Count" column of the "CDBObject" row in the "Database Indices" section.




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