Drop view is too slow - optimize
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Key: CORE-3568
URL: http://tracker.firebirdsql.org/browse/CORE-3568
Project: Firebird Core
Issue Type: Improvement
Affects Versions: 2.5.0
Reporter: Tim Kelly
Hi there. I find the drop view command very slow. About 10 seconds per view
with my current database in which I have several hundred views which depend on
each other:
22:15:45] -> Dropping view YDOV_BIZ_QUOTE
22:15:49] -> Dropping view YDOV_BIZ_REQUEST
22:15:53] -> Dropping view YDOV_BPL_PURCHASE_INVOICE
22:16:13] -> Dropping view YDOV_BPL_PURCHASE_ORDER_ITEM
22:16:17] -> Dropping view YDOV_BPL_PURCHASE_ORDER
22:16:21] -> Dropping view YDOV_BPL_ARRIVAL_NOTE
I am waiting up to 10 seconds per view and this is very frustrating as it can
take an hour to drop all my views.
I presume the delay has something to do with calculating dependencies. If this
is the case I wonder if perhaps dependencies could be cached to improve
performance? Perhaps a dependency graph cache?
All my views are system generated based on definitions made in a proprietary
high level language. My server app converts these definitions into firebird
sql on startup hence my requirement to regularly drop and create views. I know
there is now a create or alter view command - i don't know if this performs
better but I'd rather not go down this road for other technical reasons.
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