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For each History Store, a folder will be created with the name of the History Store

NameData TypeDescription
Database SizeLong

(Added 4.0.22) Created if the History Store type is Disk_Backed and shows the total size of the data tables used.

This value may be smaller than the Disk Used metric as when flushed rows are marked for deletion they are only deleted from the H2 DB on its internal schedule. This is to minimize the writes on a flash/SSD drive. 

Disk UsedLong

Created if the History Store type is Disk_Backed and shows the memory used since last module restartsize of the database file. This parameter will never go to zero for the following reasons:

  • The initial config of the DB will contain empty seeded tables based on the number of edge nodes and devices (table per edge node and per device) and at least one metadata table.

  • Flushed rows are marked for deletion and will actually be deleted from the DB on its internal schedule. This is to minimize the writes on a flash/SSD drive.

Memory UsedLongCreated if the History Store type is In_Memory and shows the memory used since last module restart

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NameData TypeDescription
Metrics StoredLong

Number of Edge Node or Device level tag change events stored. For Disk_Backed History Store, this tag is updated every 30 seconds

Records StoredLong

Number of Edge Node or Device level records stored. For Disk_Backed History Store, this tag is updated every 30 seconds

Metrics Percentage UsedFloat(Deprecated 4.0.19) Number of Edge Node or Device level tag change events stored as a percentage of the configured Edge Node or Device Tag Capacity
Records Percentage UsedFloat(Deprecated 4.0.19) Number of Edge Node or Device level tag change events stored as a percentage of the configured Edge Node or Device Record Capacity

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