Our email crossed - I wasted a couple of minutes checking the name of the
column.
GQL = Guess QuaLity ?
Regards
Jonathan Lewis
On Tue, Sep 1, 2020 at 6:15 PM Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
wrote:
It wasn’t the Oracle upgrade. It was rather PCT_DIRECT_ACCESS – it went
from 0 to 100. (Somebody updated block references.)
Sorry for the noise.
Best regards,
Nenad
*From:* Noveljic Nenad
*Sent:* Dienstag, 1. September 2020 18:51
*To:* ORACLE-L (oracle-l@xxxxxxxxxxxxx) <oracle-l@xxxxxxxxxxxxx>
*Subject:* IOT index costing in 19c
The cost estimation of an IOT secondary index dropped in 19c:
19
Index Stats::
Index: IX Col#: 1 4
LVLS: 3 #LB: 291921 #DK: 807941 LB/K: 1.00 DB/K: 26.00 CLUF:
21625156.00 NRW: 40118629.00 SSZ: 0.00 LGR: 0.00 CBK: 0.00 GQL: 100.00
CHR: 0.00 KQDFLG: 909455669 BSZ: 1
KKEISFLG: 1
12.2
Index Stats::
Index: IX Col#: 1 4
LVLS: 3 #LB: 272824 #DK: 699585 LB/K: 1.00 DB/K: 29.00 CLUF:
20503378.00 NRW: 38686507.00 SSZ: 0.00 LGR: 0.00 CBK: 0.00 GQL: 0.00 CHR:
0.00 KQDFLG: 1 BSZ: 1
KKEISFLG: 1
19
****** Costing Index IX
OPTIMIZER PERCENT INDEX CACHING = 0
SPD: Return code in qosdDSDirSetup: NODIR, estType = INDEX_SCAN
Estimated selectivity: 2.9279e-06 , col: #1
SPD: Return code in qosdDSDirSetup: NODIR, estType = INDEX_FILTER
Estimated selectivity: 2.9279e-06 , col: #1
Access Path: index (RangeScan)
Index: IX
resc_io: 67.317355 resc_cpu: 531351
ix_sel: 2.9279e-06 ix_sel_with_filters: 2.9279e-06
Cost: 67.339481 Resp: 67.339481 Degree: 1
****** Costing Index IX_BER02_PARTNER
12.2
****** Costing Index IX
OPTIMIZER PERCENT INDEX CACHING = 0
SPD: Return code in qosdDSDirSetup: NODIR, estType = INDEX_SCAN
Estimated selectivity: 2.9439e-06 , col: #1
SPD: Return code in qosdDSDirSetup: NODIR, estType = INDEX_FILTER
Estimated selectivity: 2.9439e-06 , col: #1
Access Path: index (RangeScan)
Index: IX
resc_io: 332.496503 resc_cpu: 2412554
ix_sel: 2.9439e-06 ix_sel_with_filters: 2.9439e-06
Cost: 332.596968 Resp: 332.596968 Degree: 1
The cost slumped from 332 in 12c to 67 in 19c.
A significant difference in the statistics is KQDFLG.
Does anybody understand this?
Best regards,
Nenad
http://nenadnoveljic.com/blog/
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