Expert Oracle Exadata - Parent Directory

CHAPTER 4 STORAGE INDEXESSYS@EXDB1> select count(*) from kso.skew3;COUNT(*)----------3840000481 row selected.Elapsed: 00:01:45.39SYS@EXDB1> alter session set cell_offload_processing=true;Session altered.Elapsed: 00:00:00.00SYS@EXDB1> select count(*) from kso.skew3;COUNT(*)----------3840000481 row selected.Elapsed: 00:00:23.70SYS@EXDB1> select count(*) from kso.skew3 where pk_col = 7000;COUNT(*)----------12Elapsed: 00:00:13.74SYS@EXDB1> alter session set "_kcfis_storageidx_disabled"=false;Session altered.Elapsed: 00:00:00.00SYS@EXDB1> select count(*) from kso.skew3 where pk_col = 7000;COUNT(*)----------12Elapsed: 00:00:01.06At the start of this demonstration, all offloading was disabled via the database initializationparameter, CELL_OFFLOAD_PROCESSING. Storage Indexes were also disabled, via the hidden parameter_KCFIS_STORAGEIDX_DISABLED. A query without a WHERE clause was run and was completed using directpath reads, but without offloading. That query took 1 minute and 45 seconds to do the full table scan and115