Expert Oracle Exadata - Parent Directory

CHAPTER 3 HYBRID COLUMNAR COMPRESSIONCOL2COL3COL4VARCHAR2(30)DATEVARCHAR2(1)SYS@SANDBOX1> @display_rawEnter value for string: c3 02 40 44Enter value for type: NUMBERVALUE--------------------------------------------------16367As you can see, this is the record that we updated in the SKEW_HCC3 table. Just as an aside, it isinteresting to see how the compressed block format differs from the standard uncompressed format.Here is a snippet from the original block in our example that is compressed for ARCHIVE LOW.===============tsiz: 0x1f80hsiz: 0x1cpbl: 0x2b5d7d5cea7c76543210flag=-0------ntab=1nrow=1frre=-1fsbo=0x1cfseo=0x30avsp=0x14tosp=0x14r0_9ir2=0x0mec_kdbh9ir2=0x076543210shcf_kdbh9ir2=----------76543210flag_9ir2=--R----- Archive compression: Yfcls_9ir2[0]={ }0x16:pti[0] nrow=1 offs=00x1a:pri[0] offs=0x30block_row_dump:tab 0, row 0, @0x30tl: 8016 fb: --H-F--N lb: 0x2 cc: 1nrid: 0x0217cbd4.0col 0: [8004]Compression level: 03 (Archive Low)Length of CU row: 8004kdzhrh: ------PC CBLK: 2 Start Slot: 00NUMP: 02PNUM: 00 POFF: 7974 PRID: 0x0217cbd4.0PNUM: 01 POFF: 15990 PRID: 0x0217cbd5.0CU header:CU version: 0 CU magic number: 0x4b445a30CU checksum: 0xf052958290