Sorry for being too vague, I guess it is one of those situations where the question is obvious to me even from the initial statement that I can't believe no-one else sees it as such.

What I have is a row count from a number of databases plotted against time. Rows are added to one database and are copied to the others. In a normal situation the graphs will line up or nearly line up, the row count in each database will be the same or nearly the same but because copy and sample times can vary there can be delays to the rows counts on one or more database. (Additionally it is possible for lots of rows to be added and then removed from the main database before the copy mechanism kicks in so those rows may not make it to one or more copy at all, this is not a problem).

An error situation needs reporting where the counts get out of sync and remain out of sync shown on the plots by the lines not lining up at all. The error can "clear" if and when the plots line up again (or nearly so).

Thinking things over, I would need to try to line up the time values and then compare the row counts, and report where the row counts differ more than a certain number of times in succession by a sufficient value to worry about.

In reply to Re: Comparing graph shapes or soft matching. by tweetiepooh
in thread Comparing graph shapes or soft matching. by tweetiepooh

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