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AVEVA™ Historian

SnapshotDetail

  • Last UpdatedMar 10, 2025
  • 1 minute read

Contains one row for each storage size configuration for tags. This table is used by the Classic Storage subsystem to manage the snapshot files.

Column

Data Type

Description

(PK) StorageSize

int NOT NULL

The storage size, in bytes, of the tag value: -1 = Blob; 0 = Variable length string; 1 = 1 byte; 2 = 2 byte; 4 = 4 byte; 8 = 8 byte.

SnapshotSize

int NOT NULL

The maximum size of the snapshot, in bytes. If this limit is reached, a new snapshot is created. The default is 2,097,152 bytes (2 MB).

ImageTime

int NOT NULL

The interval, in seconds, between updates to the snapshot file. The snapshot file is updated with tag value information from the snapshot buffer, which resides in memory. The default is 30 seconds, and the maximum value is 60 seconds.

ThresholdTime

int NOT NULL

The maximum amount of time, in seconds, that can elapse before a new snapshot is automatically created, provided that the value for the snapshot size has not been reached. The default is 3600 seconds (1 hour).

Status

tinyint NULL

Automatically updated by the system if a change is made to the snapshot: 0 = No change; 1 = Insertion; 2 = Modification; 3 = Deletion.

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