Updating values in sql


10-Mar-2017 11:14

I intentionally copied the output of DBCC PAGE for the next slot in the page, to show that the record with id=2 was unaffected, it continues to have a smaller size of 15 bytes and Column 3 has no physical length.Is worth saying that the new SQL Server 2012 default column value is not the same as the default value constraint.The CREATE INDEX statement is used to create indexes in tables.Indexes are used to retrieve data from the database very fast.In this article we’ll discover data modification statements used to modify data in SQL server using the INSERT, UPDATE, DELETE, and MERGE statement.The SELECT, INSERT, UPDATE, DELETE, and MERGE statement are collectively referred to DML (Data Manipulation Language) statements.Not all data types and default values can be added online.BLOB values like varchar(max), nvarchar(max), varbinary(max) and XML cannot be added online (and frankly I see no valid data model that has a non-NULL BLOB with a default…).

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First create and populate the table: dbcc traceon (3604,-1) dbcc page(6,1,217,3) Page @0x0000000170D5E000 m_page Id = (7) m_header Version = 1 m_type = 1 m_type Flag Bits = 0x0 m_level = 0 m_flag Bits = 0x200 m_obj Id (Alloc Unit Obj) = 84 m_index Id (Alloc Unit Ind) = 256 Metadata: Alloc Unit Id = 72057594043432960 Metadata: Partition Id = 72057594039042048 Metadata: Index Id = 1 Metadata: Object Id = 245575913 m_prev Page = (0:0) m_next Page = (0) pminlen = 12 m_slot Cnt = 476 m_free Cnt = 4 m_free Data = 7236 m_reserved Cnt = 0 m_xact Reserved = 0 m_xdes Id = (0:0) m_ghost Rec Cnt = 0 m_torn Bits = 2135435720 DB Frag ID = 1 Allocation Status GAM (1:2) = ALLOCATED SGAM (1:3) = ALLOCATED PFS (1:1) = 0x60 MIXED_EXT ALLOCATED 0_PCT_FULL DIFF (1:6) = CHANGED ML (1:7) = NOT MIN_LOGGED Slot 0 dbcc traceon (3604,-1) dbcc page(6,1,217,3) Page @0x0000000170D5E000 m_page Id = (7) m_header Version = 1 m_type = 1 m_type Flag Bits = 0x0 m_level = 0 m_flag Bits = 0x200 m_obj Id (Alloc Unit Obj) = 84 m_index Id (Alloc Unit Ind) = 256 Metadata: Alloc Unit Id = 72057594043432960 Metadata: Partition Id = 72057594039042048 Metadata: Index Id = 1 Metadata: Object Id = 245575913 m_prev Page = (0:0) m_next Page = (0) pminlen = 12 m_slot Cnt = 476 m_free Cnt = 4 m_free Data = 7236 m_reserved Cnt = 0 m_xact Reserved = 0 m_xdes Id = (0:0) m_ghost Rec Cnt = 0 m_torn Bits = 2135435720 DB Frag ID = 1 Allocation Status GAM (1:2) = ALLOCATED SGAM (1:3) = ALLOCATED PFS (1:1) = 0x60 MIXED_EXT ALLOCATED 0_PCT_FULL DIFF (1:6) = CHANGED ML (1:7) = NOT MIN_LOGGED Slot 0 The page header is unchanged, the last LSN is still (), proof that the page was not modified, and the physical record is unchanged and has the same size as before. If you pay attention you’ll notice that the Column 3 though has an Offset 0x0 and a physical length of 0.

This is how SQL Server 2012 knows how to show a value for Column 3 for this record, even though is physically missing on the page.



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