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offset offset offset offset offset offset offset offset
0): 0): 1): 1): 2): 2): 3): 3):
0x02 0x09 0x09 0x04 0x03 0x02 0x07 0x09
(ONE_BYTE_SHORT) (EIGHT_BYTE_SHORT) (EIGHT_BYTE_SHORT) (THREE_BYTE_SHORT) (TWO_BYTE_SHORT) (ONE_BYTE_SHORT) (SIX_BYTE_SHORT) (EIGHT_BYTE_SHORT)
So the rst column has a CD code of 0x02, which indicates a 1-byte value, and, as we see in the data row, is the integer 1. The second column contains an 8-byte value and is the Unicode string 1111. I ll leave it to you to inspect the code for the remaining columns. Figure 7-10 shows the DBCC PAGE output for the row contents, and I have indicated the meaning of the different bytes.
7
Record Memory Dump for first row from DBCC PAGE: 01089249 23978131 00310031 00310042 .. I# .1.1.1.1.B 006f0073 007300c4 e90a5300 e34b0065 .o.s.s. .S. K.e 006e0047 00610074 006f00 .n.G.a.t.o. Row expansion with byte swapping: 01 08 2994 3279 81 00 31003100 310031 00 CD array Col 1 4 bits = +1 per column 8 columns New record format Col 2 = 1111
Special Storage
42006f00 730073 c4 e90a 0053 e3 004b00 Col 3 = Boss Col 4 (date) Col 5 = S Col 6 = +99
65006e 00 47006100 74006f Col 7 = Ken Col 8 = Gato
FIGURE 7-10 A compressed row with eight short data columns
The second row returned on the rst page has a few long columns in the following data values:
The CD array for this row looks like the following:
CD CD CD CD CD CD CD CD array array array array array array array array entry entry entry entry entry entry entry entry = = = = = = = = Column Column Column Column Column Column Column Column 1 2 3 4 5 6 7 8 (cluster (cluster (cluster (cluster (cluster (cluster (cluster (cluster 0, 0, 0, 0, 0, 0, 0, 0, CD CD CD CD CD CD CD CD array array array array array array array array offset offset offset offset offset offset offset offset 0): 0): 1): 1): 2): 2): 3): 3): 0x02 0x0a 0x0a 0x04 0x03 0x02 0x0a 0x0a (ONE_BYTE_SHORT) (LONG) (LONG) (THREE_BYTE_SHORT) (TWO_BYTE_SHORT) (ONE_BYTE_SHORT) (LONG) (LONG)
Note that four of the eight columns are long data values. Figure 7-11 shows the bytes that DBCC PAGE returns for this second data row.
Record Memory Dump 6294C08B: 2108a24a 6294C09B: 12004c00 6294C0AB: 39003700 6294C0BB: 65002000 6294C0CB: 65006e00 6294C0DB: 6e006700 6294C0EB: 6e006700 23aa8256 56006000 39003600 50007200 74002000 69006e00 54006500 ed0a5300 32003400 37005600 65007300 6f006600 65006500 72007200 81010400 35003700 69006300 69006400 20004500 72006900 69004400 !. J# V .S..... ..L.V.`.2.4.5.7. 9.7.9.6.7.V.i.c. e. .P.r.e.s.i.d. e.n.t. .o.f. .E. n.g.i.n.e.e.r.i. n.g.T.e.r.r.i.D.
FIGURE 7-11 A compressed row with four short data columns and four long
Microsoft SQL Server 2008 Internals
I have highlighted the bytes in the long data region. Here are some things to notice in the rst part of the row, before the long data region:
The rst byte in the row is 0x21, indicating that not only is this row in the new CD record format, but also that the row contains a long data region. The second byte indicates there are eight columns in the table, just as for the rst row. The following 8 bytes for the CD array has four values of a, which indicate a long value not included in the short data region. The short data values are listed in order after the CD array and are as follows:
The BusinessEntityID is 1 byte, with the value 0x82, or +2 The Birthdate is 3 bytes The MaritalStatus is 1 byte, with the value 0x0053, or S The VacationHours is 1 byte, with the value 0x81, or +1
The Long Data Region Offset Array is 10 bytes long, with the following interpretation:
The rst byte is 0x01, which indicates that the row-offset positions are 2 bytes long. The second byte is 0x04, which indicates there are four columns in the long data region. The next 8 bytes are the 2-byte offsets for each of the four values. Note that the offset refers to position the column ends with the Long Data area itself.
The rst 2-byte offset is 0x0012, or 18. This indicates that the rst long value is 18 bytes long. (It is Unicode string of 9 characters, 245797967, which would need 18 bytes.) The second 2-byte offset is 0x004c, or 76, which indicates that the second long value ends 58 bytes after the rst. The second value is Vice President of Engineering, which is a 29-byte Unicode string. The third 2-byte offset is 0x0056, or 86, which indicates the third value, Terri, is 10 bytes long. The fourth 2-byte offset is 0x0060, or 96, which indicates the fourth value, Duffy, is 10 bytes long.
Because there are fewer than 30 columns, there is no Long Data Cluster Array, and the data values are stored immediately after the Long Data Region Offset Array. Due to space constraints, I won t show you the details of a row with multiple column clusters (that is, more than 30 columns), but hopefully you have enough information to start exploring such rows on your own.
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