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SQL Database migration
Graphical demonstration of
Why we should use
“Database Aliases”
SQL1
App1
db2
db1
App2
SQL1
App1
db2
db1
App2
Connect to SQL1
Connect to SQL1
Provider=SQLOLEDB; Data Source=SQL1; Database=db1;Integrated Security=SSPI
SQL1
App1
db2
db1
App2
SQL2
Connect to SQL1
Connect to SQL1
SQL1
App1
db2
db1
App2
SQL2
db2
Connect to SQL1
Connect to SQL1
SQL1
App1
db1
App2
SQL2
db2
Connect to SQL1
Connect to SQL2
Update App2 config
Using a Database Alias
• Alias can only point to an Instance.
• It does not point to a database.
• Each database now have an alias that point to the same server.– Alias1 = SQL1 (meant to reach db1)– Alias2 = SQL1 (meant to reach db2)
SQL1
App1
db1
App2db2
Connect to Alias1
Connect to Alias2
Provider=SQLOLEDB; Data Source=Alias1; Database=db1;Integrated Security=SSPI
SQL1
App1
db1
App2
SQL2
db2
Connect to Alias1
Connect to Alias2
db2
SQL1
App1
db1
App2
SQL2
Connect to Alias1
Connect to Alias2
Upd
ate
Ali a
s2=S
QL2
db2
Any questions?
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