Set Size to -1 to optimize SQL Server query plan execution - v7.0 (#1313

)
Particular · Oct 27, 2023 · ff16a13 · ff16a13
1 parent 7c2268a
commit ff16a13
Showing 1 changed file with 12 additions and 1 deletion.
diff --git a/src/SqlPersistence/Config/SqlDialect_MsSqlServer.cs b/src/SqlPersistence/Config/SqlDialect_MsSqlServer.cs
@@ -34,7 +34,18 @@ internal override void SetParameterValue(DbParameter parameter, object value)
                 if (value is ArraySegment<char> charSegment)
                 {
                     parameter.Value = charSegment.Array;
-                    parameter.Size = charSegment.Count;
+
+                    // Set to 4000 or -1 to improve query execution plan reuse
+                    // Must be set when exceeding 4000 characters for nvarchar(max)  https://stackoverflow.com/a/973269/199551
+                    parameter.Size = charSegment.Count > 4000 ? -1 : 4000;
+                }
+                else if (value is string stringValue)
+                {
+                    parameter.Value = stringValue;
+
+                    // Set to 4000 or -1 to improve query execution plan reuse
+                    // Must be set when exceeding 4000 characters for nvarchar(max)  https://stackoverflow.com/a/973269/199551
+                    parameter.Size = stringValue.Length > 4000 ? -1 : 4000;
                 }
                 else
                 {