entity framework 6 - What is the Windows overhead when using SQL Server varchar vs. nvarchar? -


i not have need foreign language characters or collation since data received pure ascii.

my concern performance in application code, , though have read many arguments varchar performs better nvarchar, did not discuss overhead converting , forth between windows unicode , sql server non-unicode varchar data?

what bigger impact in general - performance within sql server dealing varchar vs. nvarchar, or performance in application, converting , forth between unicode on windows side , non-unicode on sql server side? understand there scenarios 1 perform better other, main scenario simple text search , retrieval through couple million records. using entity framework 6.1.3 dal.

this concern , love feedback on having experimented or knowledgeable on topic. articles discussing varchar vs. nvarchar act sql database totally isolated in respect performance , external software not come play. there in fact unicode impedance mismatch between windows native use of unicode , ascii in database, storage space , transfer speeds ignored, negates ascii database performance benefits? in relation ef? thanks


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