Expert Oracle Exadata - Parent Directory

CHAPTER 3 HYBRID COLUMNAR COMPRESSIONOWNER SEGMENT_NAME TOTALSIZE_MEGS COMPRESS_FOR-------------------- ------------------------------ -------------- ------------KSO SKEW 1,460.3--------------sum 1,460.31 row selected.SYS@SANDBOX1> create table kso.skew_hcc3 nologging parallel 16 compress for archive low2 as select * from kso.skew a;Table created.SYS@SANDBOX1> @table_size2Enter value for owner: KSOEnter value for table_name: SKEW_HCC3OWNER SEGMENT_NAME TOTALSIZE_MEGS COMPRESS_FOR-------------------- ------------------------------ -------------- ------------KSO SKEW_HCC3 23.0 ARCHIVE LOW--------------sum 23.01 row selected.SYS@SANDBOX1> update /*+ parallel (a 32) */ kso.skew_hcc3 a set col1=col1;32000004 rows updated.SYS@SANDBOX1> @table_size2Enter value for owner: KSOEnter value for table_name: SKEW_HCC3OWNER SEGMENT_NAME TOTALSIZE_MEGS COMPRESS_FOR-------------------- ------------------------------ -------------- ------------KSO SKEW_HCC3 916.0 ARCHIVE LOW--------------sum 916.01 row selected.SYS@SANDBOX1> -- Check how this compares to direct path load OLTP table.SYS@SANDBOX1>SYS@SANDBOX1> create table kso.skew_oltp nologging parallel 16 compress for oltp2 as select /*+ parallel (a 16) */ * from kso.skew a;Table created.SYS@SANDBOX1> @table_size2Enter value for owner: KSOEnter value for table_name: SKEW_OLTP84