Oracle的TPCC测试，原来也是个作弊的东西...

http://www.oaktable.net/content/sorted-hash-clusters-rip

根据Jonathan Lewis老先生的测试实例，发觉cluster 的sort功能，完全是为了tpcc测试而存在的，非等值的查询语句，都会走错误的计划，得出错误的结果。

这回oracle麻烦大了...

execute dbms_random.seed(0)create cluster sorted_hash_cluster (hash_valuenumber(6,0),sort_valuevarchar2(2)sort)size 300hashkeys 100;create table sorted_hash_table (hash_valuenumber(6,0),sort_valuevarchar2(2),v1varchar2(10),paddingvarchar2(30))cluster sorted_hash_cluster (hash_value, sort_value);beginfor i in 1..5000 loopinsert into sorted_hash_table values(trunc(dbms_random.value(0,99)),dbms_random.string('U',2),lpad(i,10),rpad('x',30,'x'));commit;end loop;end;/begindbms_stats.gather_table_stats(ownname => user,tabname =>'sorted_hash_table');end;/select count(*) from sorted_hash_table where hash_value = 92;select count(*) from sorted_hash_table where hash_value = 92 and sort_value is null;select count(*) from sorted_hash_table where hash_value = 92 and sort_value is not null;select * from sorted_hash_table where hash_value = 92 and sort_value >= 'YR';select * from sorted_hash_table where hash_value = 92 and sort_value > 'YR';

oracle这3000W的数值，原来是这么出来的...

http://www.tpc.org/tpcc/results/tpcc_perf_results.asp