800xa Basic History Limit
What is the limit for 800xa Default size of the Basic history without IMS or 800XA History.
If we increase the disk space in the connectivity server, shall we able to acheive the History longterm storage. Will that has an impact on system performance
Voted best answer
Basic History has been mistreated in earlier system guides capping its max capacity to three months when in fact there is no programmatic limitation to the size of the log files. The current guide only "recommend" 90 days which is less bad than stating a blunt 90 days.
i know several installations where Basic History stores a couple of years (and more!) worth of data with no issues at all.
It IS possible to create a log sampling every second and storing for ten years, but no formal testing has been conducted on such large configurations.
However, 1s/3650d = 315+ million samples where each sample requires roughly 24 bytes of disk space = 7+ GB per log file. 10.000 such logs (only counting primary log space!) would require a hefty disk...
At this size the Basic History automatic synchronization may take forever to complete (you are probably better off by copying the files manually between two redundant Basic History providers).
I would stay away from the "several terabytes" configurations and keep number of primary logs at 10.000 or less.
Positive things about Basic History:
- Embedded and included in the 800 Base installation
- No separate license required
- Minimal footprint (no additional server required)
- Very simple configuration of templates and logs
- Accepts runtime resizing of logs (change log period and you're set if disk space allows)
- Accepts runtime manipulation of log templates (add/remove/change/etc)
- Well proven (been in the system for its entire lifetime, 15yrs+)
- In practice is "zero maintenance" required
- Data files can be copied, moves and backed up/restored with plain file moves
- Upgrade supported from the initial 1.0 version up to today's 6.0 by raw file copying
Negative things about Basic History:
- No archiving is supported
Do not go beyond 10000 logs if parallel redundancy is used (Default) and 5000 logs if fail over redundancy. There is no hard limit for log duration, but experience show 3 months is a good limit.
Ideally for 10,000 logs, less than two weeks of storage for basic history gives best performance.