A Log buffer
B Long-term memory
C Total available space in the log buffer (for example, 20 records)
Example: Partially buffered log records replicated from short-term
memory to long-term memory
In the following example, the buffer depth equals 20. The first record has already replicated to the
long-term memory, making room in the log buffer for the new records (including the newest
record, in gray).
A Log buffer
B Long-term memory
C Total available space in the log buffer (for example, 20 records)
Example: Resulting gaps in data when a partially buffered log is
full
In the graphic on the left, the log buffer (A) is full, and the oldest record has not replicated to the
long-term memory yet. This means that the new record (C) is not logged, and is permanently lost.
In the graphic on the right, the oldest record (D) was replicated to long-term memory, making
space in the buffer. The new record at the next interval (E) is logged but there is a gap in the data
for the lost record (C).
9810 series - User manual Logging
7EN05-0390-08 236
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