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sqlurlog question


W2K, v7, fp11.

I want to write my oun log miner. I use sqlurlog API.
I found that algorithm of reading logs described in
\sqllib\samples\c\asynrlog.sqc is very inconvenient:
I make first call with
callerAction = SQLU_RLOG_QUERY
and get initial and current LSNs.
But when I assign them to start and end LSNs respectively and call sqlurlog
callerAction = SQLU_RLOG_READ
I get error with sqlcode=-2657:
The Asynchronous Log Reader requires log file
"<name>" which does not currently reside in the
database log directory.
That is absolutely true: since it is too old logfile I have already archived
and removed it.
So I can't continue...
My question is: is any way to calculate VALID start LSN based on end LSN for
Because now I have to do this:
1. start LSN = end LSN = current LSN;
2. while (sqlca.sqlcode!=0):
start LSN = start LSN - 1;
call sqlurlog with these start and end LSNs;
But it is very ineffective because I can call sqlurlog some thousands times
with sqlca.sqlcode=-2650 before I get sqlca.sqlcode=0

Thanks in advance,
Nov 12 '05 #1
1 2401
Another question:
Is any way to get any valid LSN from particular log file?
Nov 12 '05 #2

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