Posted on 2014-03-05
Last Modified: 2014-03-06
Hi All
does anyone have a simple answer regarding the Encrypt database option.
Specifically (and ref the ominous message re row-level locking), does it impact performance, or negate the notification re 'changed by someone else ..'?

In a multi-user environment, is encryption OK?

thank you
Question by:COACHMAN99
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LVL 57

Accepted Solution

Jim Dettman (Microsoft MVP/ EE MVE) earned 500 total points
ID: 39908174
<<does it impact performance>>

Yes.  Everything gets un-encrypted and encrypted on the fly.  You don't get something for nothing.

<<, or negate the notification re 'changed by someone else ..'?>>

 It doesn't change anything else.  All it means is that when stored on disk, the data is encrypted.  

 Locking and all other functions are the same.


Author Closing Comment

ID: 39908244
OK Thanks Jeff. (I'm assuming low % impact on performance when 10 concurrent users?)
LVL 57
ID: 39908950
Depends on a number of factors; available CPU, amount of data, pattern of usage, etc.

It's not the type of thing that it's easy to say if it will have a large or small impact other then trying it.

 The only thing you can state for certain is that it will result in less performance if it's turned on.

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Author Comment

ID: 39909874
cheers Jim.
LVL 75
ID: 39910012
Jim ... did encryption change in A2010? Because in <=A2003, all it did was ... say you opened an MDB in Word ... it would be *totally unreadable* ... as I recall.

Are you saying now that it actually encrypts data ?

LVL 57
ID: 39910044

  Not sure what you mean, Access has always had the ability to encrypt and if you did, the data was unreadable.

  But yes, the encryption method was changed int he past couple of releases (Believe it was A2010) because the old method had become crackable.

LVL 75
ID: 39910168
I don't recall ... Encryption from with in the Access UI ... every actually encrypting data. Are you positive about that ? I assume you have tried it ?
LVL 57
ID: 39910195
Yes.   In an un-encrypted DB, you could take Word and open the db and read the fields.   Yes, there would be a lot of junk, but if you understand the structure, you can read the data.

With encryption turned on, you can't read the pages at all.

LVL 75
ID: 39910220
Understood. But ... if you ... say were to Encrypt a BE data db - and send it to me - and I open it with Access - is the data going to be encrypted ?

Author Comment

ID: 39910293
If you cant read the data with an 'external' editor e.g. Word, then it must be encrypted.
and, if you open it using the password then your 'view' is un-encrypted,

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