How ix_sel is calculated? Jonathan Lewis please help
There is table TETRO, partitioned by column BSTATE, and subpartitioned by column C (not present below).
Also there is query:
SELECT *
FROM TETRO T
WHERE T.BOST = 'BB810'
and BSTATE = 'CLOSED'And there is global index IDX_1 on columns BOST, BSTATE.
The questions are following:
1. How in this case calculated ix_sel for the index above?
2. How calculated cardinality of index?
I think it is really one question.
Thie is excerpt from 10053:
QUERY BLOCK TEXT
SELECT *
FROM TETRO T
WHERE T.BOST = 'BB810'
and BSTATE = 'CLOSED'
QUERY BLOCK SIGNATURE
qb name was generated
signature (optimizer): qb_name=SEL$1 nbfros=1 flg=0
fro(0): flg=0 objn=789900 hint_alias="T"@"SEL$1"
SYSTEM STATISTICS INFORMATION
Using WORKLOAD Stats
CPUSPEED: 1033 millions instructions/sec
SREADTIM: 0 milliseconds
MREADTIM: 1 millisecons
MBRC: 12.000000 blocks
MAXTHR: -1 bytes/sec
SLAVETHR: -1 bytes/sec
BASE STATISTICAL INFORMATION
Table Stats::
Table: TETRO Alias: T Partition [7]
#Rows: 5689355 #Blks: 490747 AvgRowLen: 267.00
#Rows: 5689355 #Blks: 490747 AvgRowLen: 267.00
Index Stats::
Index: IDX_1 Col#: 7 9
LVLS: 3 #LB: 337246 #DK: 453 LB/K: 744.00 DB/K: 36878.00 CLUF: 16705760.00
Index: IDX_2 Col#: 7 PARTITION [7]
LVLS: 2 #LB: 28106 #DK: 2 LB/K: 14053.00 DB/K: 392101.00 CLUF: 784203.00
LVLS: 2 #LB: 28106 #DK: 2 LB/K: 14053.00 DB/K: 392101.00 CLUF: 784203.00
SINGLE TABLE ACCESS PATH
BEGIN Single Table Cardinality Estimation
Column (#7): BOST(VARCHAR2) Part#: 7
AvgLen: 7.00 NDV: 16 Nulls: 0 Density: 0.0625
Column (#7): BOST(VARCHAR2)
AvgLen: 7.00 NDV: 16 Nulls: 0 Density: 0.0625
Column (#9): BSTATE(VARCHAR2) Part#: 7
AvgLen: 6.00 NDV: 1 Nulls: 0 Density: 1
Column (#9): BSTATE(VARCHAR2)
AvgLen: 6.00 NDV: 1 Nulls: 0 Density: 1
Table: TETRO Alias: T
Card: Original: 5689355 Rounded: 355585 Computed: 355584.69 Non Adjusted: 355584.69
END Single Table Cardinality Estimation
Access Path: TableScan
Cost: 142335.78 Resp: 142335.78 Degree: 0
Cost_io: 122064.00 Cost_cpu: 5486476442
Resp_io: 122064.00 Resp_cpu: 5486476442
kkofmx: index filter:"T"."BSTATE"='CLOSED'
kkofmx: index filter:"T"."BSTATE"='CLOSED'
kkofmx: index filter:"T"."BOST"='BB810' AND "T"."BSTATE"='CLOSED'
kkofmx: index filter:"T"."BOST"='BB810' AND "T"."BSTATE"='CLOSED'
kkofmx: index filter:"T"."BSTATE"='CLOSED'
Access Path: index (AllEqRange)
Index: IDX_1
resc_io: 37627.00 resc_cpu: 351652199
ix_sel: 0.0022075 ix_sel_with_filters: 0.0022075
Cost: 38926.31 Resp: 38926.31 Degree: 1
Access Path: index (AllEqRange)
Index: IDX_2
resc_io: 50772.00 resc_cpu: 980748811
ix_sel: 0.0625 ix_sel_with_filters: 0.0625
Cost: 54395.73 Resp: 54395.73 Degree: 1
****** trying bitmap/domain indexes ******
****** finished trying bitmap/domain indexes ******
Best:: AccessPath: IndexRange Index: IDX_1
Cost: 38926.31 Degree: 1 Resp: 38926.31 Card: 355584.69 Bytes: 0
OPTIMIZER STATISTICS AND COMPUTATIONS
GENERAL PLANS
Considering cardinality-based initial join order.
Permutations for Starting Table :0
Join order[1]: TETRO[T]#0
Best so far: Table#: 0 cost: 38926.3068 card: 355584.6875 bytes: 94941195
(newjo-stop-1) k:0, spcnt:0, perm:1, maxperm:80000
Number of join permutations tried: 1
Final - First Rows Plan: Best join order: 1
Cost: 38926.3068 Degree: 1 Card: 355585.0000 Bytes: 94941195
Resc: 38926.3068 Resc_io: 37627.0000 Resc_cpu: 351652199
Resp: 38926.3068 Resp_io: 37627.0000 Resc_cpu: 351652199
kkoipt: Query block SEL$1 (#0)
Current SQL statement for this session:
explain plan for
SELECT *
FROM TETRO T
WHERE T.BOST = 'BB810'
and BSTATE = 'CLOSED'
============
Plan Table
============
------------------------------------------------------+-----------------------------------+---------------+
| Id | Operation | Name | Rows | Bytes | Cost | Time | Pstart| Pstop |
------------------------------------------------------+-----------------------------------+---------------+
| 0 | SELECT STATEMENT | | | | 38K | | | |
| 1 | TABLE ACCESS BY GLOBAL INDEX ROWID | TETRO | 347K | 91M | 38K | 00:00:11 | ROW LOCATION| ROW LOCATION|
| 2 | INDEX RANGE SCAN | IDX_1 | 12K | | 828 | 00:00:01 | | |
------------------------------------------------------+-----------------------------------+---------------+
Predicate Information:
2 - access("T"."BOST"='BB810' AND "BSTATE"='CLOSED')
I expected that ix_sel will equal density(BOST in parition 7) * density(BSTATE in parition 7) = 0.0625
And cardinality of index scan = ix_sal * num_rows(in parition 7) = 355K.
And I see this calculations in section Table
Table: TETRO Alias: T
Card: Original: 5689355 Rounded: 355585 Computed: 355584.69 Non Adjusted: 355584.69But why ix_sel(IDX_1) = 0.0022075 (instaed of 0.0625)?
And cardinality of index range scan is 12K instead of 355K ?
Fathers, please help to understand following piece (10053 on the bottom of the page).
This similar case as above. The same tables and predicates.
But local index is used (forced by a hint).
select --+ index(t TETROBOSTMANAGEDBYCLOSEDSTATES)
from TETRO t
where BSTATE = 'CLOSED'
and BOST = 'BS277'Please notice, I force partition pruning using predicate BSTATE = 'CLOSED'.
And number of subpartitions is 13.
This index consists columns BOST(just a column), C (subpartition key), C1 (just a column)
So, in this case ix_sel and cardinality same as I expected to see w/o histograms.
Access Path: index (RangeScan)
Index: TETROBOSTMANAGEDBYCLOSEDSTATES
resc_io: 269487.00 resc_cpu: 1987916858
ix_sel: 0.0625 ix_sel_with_filters: 0.0625
Cost: 276832.08 Resp: 276832.08 Degree: 1
Best:: AccessPath: IndexRange Index: TETROBOSTMANAGEDBYCLOSEDSTATES
Cost: 276832.08 Degree: 1 Resp: 276832.08 Card: 355584.69 Bytes: 0But why final execution plan has another cardinality of index scan (31K)?
============
Plan Table
============
-----------------------------------------------------------------------------+-----------------------------------+---------------+
| Id | Operation | Name | Rows | Bytes | Cost | Time | Pstart| Pstop |
-----------------------------------------------------------------------------+-----------------------------------+---------------+
| 0 | SELECT STATEMENT | | | | 270K | | | |
| 1 | PARTITION RANGE SINGLE | | 347K | 91M | 270K | 00:01:13 | 8 | 8 |
| 2 | PARTITION LIST ALL | | 347K | 91M | 270K | 00:01:13 | 1 | 27 |
| 3 | TABLE ACCESS BY LOCAL INDEX ROWID | TETRO | 347K | 91M | 270K | 00:01:13 | 190 | 216 |
| 4 | INDEX RANGE SCAN | TETROBOSTMANAGEDBYCLOSEDSTATES| 31K | | 5844 | 00:00:02 | 190 | 216 |
-----------------------------------------------------------------------------+-----------------------------------+---------------+
Predicate Information:
3 - filter("BSTATE"='CLOSED')
4 - access("BOST"='BS277')
QUERY BLOCK TEXT
select --+ index(t TETROBOSTMANAGEDBYCLOSEDSTATES)
* from TETRO t where BSTATE = 'CLOSED' and BOST = 'BS277'
BASE STATISTICAL INFORMATION
Table Stats::
Table: TETRO Alias: T Partition [7]
#Rows: 5689355 #Blks: 490747 AvgRowLen: 267.00
#Rows: 5689355 #Blks: 490747 AvgRowLen: 267.00
Index Stats::
Index: TETROBOSTMANAGEDBYCLOSEDSTATES Col#: 7 11 25 PARTITION [7]
LVLS: 3 #LB: 87376 #DK: 3679167 LB/K: 1.00 DB/K: 1.00 CLUF: 4224354.00
LVLS: 3 #LB: 87376 #DK: 3679167 LB/K: 1.00 DB/K: 1.00 CLUF: 4224354.00
User hint to use this index
SINGLE TABLE ACCESS PATH
BEGIN Single Table Cardinality Estimation
Column (#9): BSTATE(VARCHAR2) Part#: 7
AvgLen: 6.00 NDV: 1 Nulls: 0 Density: 1
Column (#9): BSTATE(VARCHAR2)
AvgLen: 6.00 NDV: 1 Nulls: 0 Density: 1
Column (#7): BOST(VARCHAR2) Part#: 7
AvgLen: 7.00 NDV: 16 Nulls: 0 Density: 0.0625
Column (#7): BOST(VARCHAR2)
AvgLen: 7.00 NDV: 16 Nulls: 0 Density: 0.0625
Table: TETRO Alias: T
Card: Original: 5689355 Rounded: 355585 Computed: 355584.69 Non Adjusted: 355584.69
END Single Table Cardinality Estimation
Access Path: index (RangeScan)
Index: TETROBOSTMANAGEDBYCLOSEDSTATES
resc_io: 269487.00 resc_cpu: 1987916858
ix_sel: 0.0625 ix_sel_with_filters: 0.0625
Cost: 276832.08 Resp: 276832.08 Degree: 1
Best:: AccessPath: IndexRange Index: TETROBOSTMANAGEDBYCLOSEDSTATES
Cost: 276832.08 Degree: 1 Resp: 276832.08 Card: 355584.69 Bytes: 0
OPTIMIZER STATISTICS AND COMPUTATIONS
GENERAL PLANS
Considering cardinality-based initial join order.
Permutations for Starting Table :0
Join order[1]: TETRO[T]#0
Best so far: Table#: 0 cost: 276832.0812 card: 355584.6875 bytes: 94941195
(newjo-stop-1) k:0, spcnt:0, perm:1, maxperm:80000
============
Plan Table
============
-----------------------------------------------------------------------------+-----------------------------------+---------------+
| Id | Operation | Name | Rows | Bytes | Cost | Time | Pstart| Pstop |
-----------------------------------------------------------------------------+-----------------------------------+---------------+
| 0 | SELECT STATEMENT | | | | 270K | | | |
| 1 | PARTITION RANGE SINGLE | | 347K | 91M | 270K | 00:01:13 | 8 | 8 |
| 2 | PARTITION LIST ALL | | 347K | 91M | 270K | 00:01:13 | 1 | 27 |
| 3 | TABLE ACCESS BY LOCAL INDEX ROWID | TETRO | 347K | 91M | 270K | 00:01:13 | 190 | 216 |
| 4 | INDEX RANGE SCAN | TETROBOSTMANAGEDBYCLOSEDSTATES| 31K | | 5844 | 00:00:02 | 190 | 216 |
-----------------------------------------------------------------------------+-----------------------------------+---------------+
Predicate Information:
3 - filter("BSTATE"='CLOSED')
4 - access("BOST"='BS277')
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