в•‘ partition_id в•‘ colName в•‘ IsInrow в•‘ IsSparse в•‘ IsRecordPrefixCompressed в•‘ IsSymbol в•‘ PrefixBytes в•‘ InRowLength в•‘ file_id в•‘ page_id в•‘ slot_id в•‘ This query uses the undocumented, and unsupported, functions sys.fn_RowDumpCracker and sys.fn_PhyslocCracker to show some interesting details about the table: SELECT rdc.*Д¬ROSS APPLY sys.fn_RowDumpCracker(%%rowdump%%) rdcД¬ROSS APPLY sys.fn_physlocCracker(%%physloc%%) plc Now we'll insert a single row: INSERT INTO dbo.varchartest (varchar30, varchar255, varchar256) In case you are interested in storage internals, you can use the following tiny test to better understand how SQL Server stores uncompressed row-store data.ДЇirst, we'll create a table where we can store columns of various sizes: IF OBJECT_ID(N'dbo.varchartest', N'U') IS NOT NULL If you design columns with a generic width, such as (255), you may run into this warning far more often than expected. 1700 bytes is the maximum key size for non-clustered indexes on newer versions of SQL Server. For some combination of large values, the insert/update operation will fail.Д©00 bytes is the maximum key size for clustered indexes (and non-clustered indexes on SQL Server 2012 and older). The index 'IX_WideIndex_01' has maximum length of 1110 bytes. Warning! The maximum key length is 900 bytes. The attempt to create the index above results in this warning: Indexes on columns that are oversize can result in errors being generated: CREATE TABLE dbo.WideIndex Having oversized columns can be detrimental to performance. SQL Server uses the size of each column in it's query optimizer to understand estimated memory requirements for query processing. This is especially prudent advice if you ever need to index a column, or if you are using a column as a primary key and it has foreign key references. If you only need 30 characters, why create a column that can handle 255? I'm so glad you're not advocating using varchar(max) for your string columns. Do NOT use a 'standard' size for each column. Reason why I need to read 0-255 from the pots so I can configure at what range I need to analogWrite to through pwm so I wont have to compile forever when I can get a reading off the value of the potвЂ¦Д«asically IвЂ™m turning the motor on the mirrors at certain speeds for certain affects with my spirograph IвЂ™m building.Size each and every column appropriately. Int enablePin1 = 12 // hbridge enable pin connected to digital 12 Int enablePin = 9 //h bridge enable pin connected to digital 9 Int motor3Pin = 10 // hbridge pin connected to digital 10

Int motor2Pin = 6 // h bridge pin connected to digital 6 Int motor1Pin = 5 // h bridge pin connected digital 5 Int pot3 = 2 // pot3 connected to analog 2 Int pot2 = 1 // pot2 connected to analog 1 Int pot1 = 0 // pot1 connected to analog 0 Const int switchPin = 2 // switch connected to digital pin 2

255 255 255 0