DB2 V10 and column distributions
Hi all,
since a few some of our customers work with DB2 Version 10 in production.
And now it seems that the explain functionality in the transaction sbde works a little bit fuzzy if it displays the column distributions.
Here comes an example on table ICLCCEVENTB:
column cardinality:
|Column Name|Cardinality|
|CLIENT | 1 |
|ACTIVE | 1 |
|CCEVENT | 6.617.921 |
|ROLE | 22 |
|BPARTNER | 2.164.627 |
|PHONEADDR | 1 |
|PHONEID | 1 |
|CHANGETIME | 1.031.781 |
|CHANGEDBY | 3.840 |
|DELETED | 3 |
|NAME | 1.451.192 |
|DESCRIP | 1.451.192 |
|REFERENCE | 1 |
indexes:
|Index |Index Columns |1st Key| Full Key|
|ICLCCEVENTB~0 |CLIENT,ACTIVE,CCEVENT,ROLE,BPARTNER| 1 |14.335.378 |
|ICLCCEVENTB~003|CLIENT,CCEVENT | 1 | 6.617.921 |
column distributions.
|Column Group |Low|High|Cardinality|Freq[%]|Type |
|CLIENT,ACTIVE,CCEVENT,ROLE,BPARTNER| | |14.335.378 | 0,0|Cardinality| => obsolete, Full Key Index ~0
|CLIENT,ACTIVE,CCEVENT,ROLE,BPARTNER| | |14.269.582 | 0,0|Cardinality| ? CLIENT,ACTIVE, CCEVENT, ROLE
|CLIENT,ACTIVE,CCEVENT,ROLE,BPARTNER| | | 6.617.921 | 0,0|Cardinality| ? CLIENT,ACTIVE, CCEVENT
|CLIENT,ACTIVE,CCEVENT,ROLE,BPARTNER| | | 1 | 0,0|Cardinality| ? CLIENT,ACTIVE
|CLIENT |xxx|xxxx| 1 | 100,0|Frequency | ok
But if i look into the catalog, i get the same data:
select cardf,
colgroupcolno,
numcolumns,
frequencyf
from sysibm.syscoldist
where tbname = 'ICLCCEVENTB'
| CARDF|COLGROUPCOLNO |NUMCOLUMNS| FREQUENCYF|
| 2,6920730000E+06|0001000500000000000000...| 2 |-1,0000000E+00| CLIENT,BPARTNER
| 4,1960410000E+06|0001000500040000000000...| 3 |-1,0000000E+00| CLIENT,BPARTNER,ROLE
|-1,0000000000E+00|0001000500040000000000...| 1 | 1,0000000E+00| CLIENT,BPARTNER,ROLE
| 1,4335378000E+07|0001000200030004000500...| 5 |-1,0000000E+00| CLIENT,ACTIVE,CCEVENT,ROLE
| 1,4269582000E+07|0001000200030004000500...| 4 |-1,0000000E+00| CLIENT,ACTIVE,CCEVENT,ROLE
| 6,6179210000E+06|0001000200030004000500...| 3 |-1,0000000E+00| CLIENT,ACTIVE,CCEVENT,ROLE
| 1,0000000000E+00|0001000200030004000500...| 2 |-1,0000000E+00| CLIENT,ACTIVE,CCEVENT,ROLE
select *
from sysibm.syskeys
where ixname like 'ICLCCEVENTB%'
|IXNAME |IXCREATOR|COLNAME |COLNO|COLSEQ|ORDERING|IBMREQD|PERIOD|
|ICLCCEVENTB~0 |SAPR3 |CLIENT | 1 | 1 |A |N | |
|ICLCCEVENTB~0 |SAPR3 |ACTIVE | 2 | 2 |A |N | |
|ICLCCEVENTB~0 |SAPR3 |CCEVENT | 3 | 3 |A |N | |
|ICLCCEVENTB~0 |SAPR3 |ROLE | 4 | 4 |A |N | |
|ICLCCEVENTB~0 |SAPR3 |BPARTNER| 5 | 5 |A |N | |
|ICLCCEVENTB~003|SAPR3 |CLIENT | 1 | 1 |A |N | |
|ICLCCEVENTB~003|SAPR3 |CCEVENT | 3 | 2 |A |N | |
Has anyone an explanation for this ? Could be a bug in the runstats ?
best regards
Kay
Hi,
The Note is available, the patches are not yet though. They will be added to the sp patch information once available. I think this might taje another week or two.
Frohe Weihnachten ebenso.
Regards, Joerg
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