Do you have some tips on deadlock avoidence for TDS?

Question

Hi All,
I developed a small BBS(multi-threaded web app) using BDB as backend database, providing view/post/update messages which will accordingly invoke operations on databases like forum.db/thread.db/post.db in one thread, however, I find a tip as follows in BDB document to Avoid Blocks
Reduce the length of time your application holds locks
does it mean I should do (in one thread)
start transaction
update forum.db
end transaction
start transaction
update thread.db
end transaction
start transaction
update post.db
end transaction
instead of
start transaction
update forum.db
update thread.db
update post.db
end transaction
do I understand that?

Answer 1

Hi, thanks for your quick response.
Maybe there are many threads at the same time, not only one. In such situation, should I make transaction granularity smaller? like
start transaction
update forum.db
end transaction
start transaction
update thread.db
end transaction
start transaction
update post.db
end transaction
this will comply with that rule, Reduce the length of time your application holds locks? can make possibility of deadlock as low as possible?
Another, I can make sure the access order.