Hi all,

I got the 10053 trace file, the base statistical infor are same.

However, the access ps_job table are different.

BASE STATISTICAL INFORMATION

Table Stats::

Table: PS_JOB Alias: J2

#Rows: 336843 #Blks: 22604 AvgRowLen: 463.00

Index Stats::

Index: PS0JOB Col#: 5 1 2 163 164

LVLS: 2 #LB: 1910 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

309626.00

Index: PS1JOB Col#: 6 1 2 163 164

LVLS: 2 #LB: 2169 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

314564.00

Index: PS2JOB Col#: 7 1 2 163 164

LVLS: 2 #LB: 1993 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

314222.00

Index: PS3JOB Col#: 8 1 2 163 164

LVLS: 2 #LB: 1870 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

310110.00

Index: PS4JOB Col#: 9 1 2 163 164

LVLS: 2 #LB: 1826 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

309689.00

Index: PSAJOB Col#: 1 2 163 164 6

LVLS: 2 #LB: 2112 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

309626.00

Index: PSBJOB Col#: 1 2 163 164 15 12 11

LVLS: 2 #LB: 2021 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

309626.00

Index: PSCJOB Col#: 142

LVLS: 2 #LB: 688 #DK: 964 LB/K: 1.00 DB/K: 63.00 CLUF: 61489.00

Index: PS_JOB Col#: 1 2 163 164

LVLS: 2 #LB: 1660 #DK: 336843 LB/K: 1.00 DB/K: 1.00 CLUF:

309626.00

Access path analysis for PS_JOB

SINGLE TABLE ACCESS PATH

Single Table Cardinality Estimation for PS_JOB[J2]

Table: PS_JOB Alias: J2

Card: Original: 336843.000000 Rounded: 34 Computed: 33.68 Non

Adjusted: 33.68

Access Path: TableScan

Cost: 6152.01 Resp: 6152.01 Degree: 0

Cost_io: 6124.00 Cost_cpu: 235247591

Resp_io: 6124.00 Resp_cpu: 235247591

Access Path: index (index (FFS))

Index: PS0JOB

resc_io: 519.00 resc_cpu: 71033682

ix_sel: 0.000000 ix_sel_with_filters: 1.000000

Access Path: index (FFS)

Cost: 527.46 Resp: 527.46 Degree: 1

Cost_io: 519.00 Cost_cpu: 71033682

Resp_io: 519.00 Resp_cpu: 71033682

Access Path: index (index (FFS))

Index: PS1JOB

Bad one had the newdensity which was not in the good trace.

Access path analysis for PS_JOB

SINGLE TABLE ACCESS PATH

Single Table Cardinality Estimation for PS_JOB[J2]

Column (#1):

NewDensity:0.000026, OldDensity:0.000036 BktCnt:254, PopBktCnt:0,

PopValCnt:0, NDV:38130

Column (#2):

NewDensity:0.000192, OldDensity:0.000002 BktCnt:5195,

PopBktCnt:5195, PopValCnt:7, NDV:7

Table: PS_JOB Alias: J2

Card: Original: 336843.000000 Rounded: 1 Computed: 1.26 Non

Adjusted: 1.26

Access Path: TableScan

Cost: 6151.99 Resp: 6151.99 Degree: 0

Cost_io: 6124.00 Cost_cpu: 235078951

Resp_io: 6124.00 Resp_cpu: 235078951

Access Path: index (index (FFS))

Index: PS0JOB

resc_io: 519.00 resc_cpu: 70865702

ix_sel: 0.000000 ix_sel_with_filters: 1.000000

Access Path: index (FFS)

Cost: 527.44 Resp: 527.44 Degree: 1

Cost_io: 519.00 Cost_cpu: 70865702

Resp_io: 519.00 Resp_cpu: 70865702