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In general, as long as you're using a Jet/ACE data store, the best security you're going to get is that provided by Jet ULS. Jet user-level security was intended for this purpose and works fine insofar as it's "security" for any meaningful definition of the term. Now, for your actual question, there are a number of ways to accomplish restricting some users to read-only and granting others write privileges. Now, obviously, certain kinds of apps might be exceptions to that, but if I ran into such an app, I'd likely try to engineer it away by redesigning the schema so that it would be very uncommon for two users to edit the same record (usually by going to some form of transactional editing instead, where changes are made by adding records, rather than editing the existing data). One might think that you want to use record-level pessimistic locking, but the fact is that in the vast majority of apps, two users are almost never editing the same record. Frankly, I've never thought it worth the trouble to set up record-level locking, as optimistic locking takes care of most of the problems. Optimistic locking is what you should start with as it requires no coding to implement it, and for small users populations it hardly ever causes a problem.Īll Records means that the whole table is locked any time an edit is launched.Įdited Record means that fewer records are locked, but whether or not it's a single record or more than one record depends on whether your database is set up to use record-level locking (first added in Jet 4) or page-level locking. No locks means you are using OPTIMISTIC locking, which means you allow multiple users to edit the record and then inform them after the fact if the record has changed since they launched their own edits. Edited Record is how you set the default record locking for WRITES.
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The information on setting locks in the Access options has nothing to do with read vs. Nobody has really answered this in any complete fashion.
#Ms access programme code#
Q1: How can we make sure that the write-user can make changes to the table data while other users use the data? Do the read-users put locks on tables? Does the write-user have to put locks on the table? Does Access do this for us or do we have to explicitly code this? I find the answers to this question to be problematic, confusing and incomplete, so I'll make an effort to do better. Our background is mostly in Oracle, where is Access different in handling multiple users? Is there such thing as "isolation levels" in Access?Īny tips or pointers to helpful articles would be greatly appreciated.Which settings in MS Access have an influence on how things are handled?.while they are being used? How can we "program" without being in the way of the users? Are there any common problems with "MS Access transactions" that we should be aware of?.How can we make sure that the write-user can make changes to the table data while other users use the data? Do the read-users put locks on tables? Does the write-user have to put locks on the table? Does Access do this for us or do we have to explicitly code this?.We're not so much concerned about the security aspects, but more about some of the following issues: Most users will be read-only, but there will be a few (currently one or two) users that have to be able to do changes (while the read-only users are also using the DB). (Using a different back-end is another, but more long-term option that is unfortunately currently not acceptable.)
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We're thinking of "growing" a little MS-Access DB with a few tables, forms and queries for multiple users.