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Indexes in group data logging tables. |
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Columns and rows in group data logging tables. |
Indexes in group data logging tables
Indexes in Group logging tables include a:
Unique primary key index on
the timestamp column.
Unique primary key index on
the timestamp_utc column.
If you have selected the project name table attribute, the primary key index also includes the project name column.
The primary key includes an MSEC column, if milliseconds is enabled.
Columns and rows in group data logging tables
Columns and rows in Group logging tables are as follows.
Note: The prefix of each attribute column is based on the SQL Field Prefix specified for the point.
The index of each column is based on the point array element. Non array points always have index value of '0' (e.g. <prefix>_VAL0)
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Column Name |
Data Type |
Description |
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Constant fields |
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timestamp |
date/time |
Timestamp of the logging event |
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timestamp_utc |
date/time |
UTC timestamp of the logging event |
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Attribute fields |
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<prefix>_ALRM<index> |
string |
Alarm state of the point . |
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<prefix>_ENG<index> |
string |
Engineering units label of the point. |
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<prefix>_PREV<index> |
Depends on point type |
Previous logged value of the point for the same logging event. |
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<prefix>_QUALITY<index> |
number |
Point quality flags. |
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<prefix>_RAW<index> |
Depends on point type |
Raw value of the point. |
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<prefix>_RES<index> |
string |
CIMPLICITY Resource associated with the point. |
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<prefix>_TIME<index> |
date/time |
Previous time the point was logged for the same logging event. |
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<prefix>_USER<index> |
number |
Value of the user defined flags. |
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<prefix>_VAL<index> |
Depends on point type |
Value of the point. |
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Optional fields |
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project |
string |
Name of the CIMPLICITY project |
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msec |
number |
Actual number of milliseconds in the timestamp |
Note: The maximum number of columns a
table can have is SBMS specific. Consult your DBMS documentation to
ensure that your Group table does not exceed these limits. Default
MSDE DBMS is 1024 columns,
8060 Bytes per row.
Important: Since the Microsoft Access and Oracle
format does not support sub-second timestamp data, you cannot log
points to a Group table at sub-second rates. Attempting to do so
will cause the duplicate-keyed records to be dropped from the
database, unless you have enabled millisecond logging.
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Choose a group table. |
