问题
So I have two SQL Servers at the moment, both 2012 and both running separate systems.
One of these servers runs on a collation of latin1_general_bin and the other runs with latin1_general_ci_as, ideally I'd like to shut one of these servers off and move all the systems to one place.
I know this can be done technically, however I was wondering if this was a good idea? Will I be causing myself more problems down the line?
Both databases are transactional based and are defined by external parties so cannot have their collation changed. If I were as to do this, would it be better to have the server collation set as latin1_general_bin or latin1_general_ci_as? I'm thinking that the case sensitive option would be better as queries would still run against case insensitive databases whilst case insensitive queries would need to be carefully managed
回答1:
There should be no problem using databases with different collations on one server. One of our external vendors also provides a database with different collation and this has been working without issues since SQL Server 2000. However, you will have to explicitly specify the collation (or use collation database_default when you want to join tables from the different databases. From my own experience, that can have quite a performance impact. You also need to be careful when using SELECT INTO when creating a new table as this can result in mixed collation in a database or table.
回答2:
Yes, SQL Server keeps the collation neatly separated with the databases. But there is a big flaw, which caused severe problems with one of our customers:
The temp table (CREATE TABLE #Tbl ...) uses the server's default collation if you do not specify the collation explicitly.
In one of our projects, especially with quite old stored Procedures created with SQL Server 2000, there was heavy usage of temp tables to store intermediate results.
The customer ran into crazy errors and it took a hell of a lot of time to track this down. He did not want to change his server (due to other databases running there). So we changed the database to his collation. After this some of our upgrade scripts did not run anymore... It ended with all databases changed to the same collation and the installation of another instance of SQL Server.
Which collation is the best for you? I don't know... This depends on your needs. Are you dealing with diacritic characters a lot (look at "_as"), do you want "test" to be equal with "TeSt" (look at "_ci")
来源：https://stackoverflow.com/questions/35839794/can-databases-with-different-collations-get-along-on-one-server