In sqlserver DB,for the string,we have types: NVARCHR,VARCHAR.
In mapping class,if you use default set the type to "string" but the column type is varchar in DB,that will cause a transfer in DB side when searching comparing,if unfortunately you have a huge data in the table,the DB transer will be more huge,it will deadblock you DB.
To solve it if in DB its type is VARCHAR,in Mapping class should use:
[Property(Type = "AnsiString")] instead.
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