Trying to make sense of histogram data

Hi,
I'm trying to create some histograms for some highly skewed columns and try to make sense of the gathered statistics.
The table I am analyzing has two columns:
TRE_ID_O indicates the transaction number in which the row was added.
TRE_ID_V indicates the transaction number in which the row was deleted.
Transaction # 1 loads a lot of data. All loaded rows will have TRE_ID_O = 1 and TRE_ID_V = null.
In subsequent transactions rows are added and deleted. After some time the data distribution over the transaction ID's looks like this:
Count(*) TRE_ID_O
944940      1
1        2
1        4
2        5
1        6
1        7
1        8
1        12
1        13
1        14
1        15
1        16
1        17
1        18
1        19
1        20
1        21
COUNT(*) TRE_ID_V
944940      <null>
1        2
1        4
2        5
1        6
1        7
1        8
1        12
1        13
1        14
1        15
1        16
1        17
1        18
1        19
1        20
1        21Using the index on tre_id_o and tre_id_v for transaction numbers > 1 will be very selective.
Histogram data:
DBMS_STATS.GATHER_TABLE_STATS('NGM101','NGG_BASISCOMPONENT', METHOD_OPT => 'FOR COLUMNS SIZE auto tre_id_o');
DBMS_STATS.GATHER_TABLE_STATS('NGM101','NGG_BASISCOMPONENT', METHOD_OPT => 'FOR COLUMNS SIZE auto tre_id_v'); In DBA_HISTOGRAMS I find:
COLUMN_NAME ENDPOINT_NUMBER ENDPOINT_VALUE
TRE_ID_V    1               2
TRE_ID_V    2               4
TRE_ID_V    4               5
TRE_ID_V    5               6
TRE_ID_V    6               7
TRE_ID_V    7               8
TRE_ID_V    8               12
TRE_ID_V    9               13
TRE_ID_V    10              14
TRE_ID_V    11              15
TRE_ID_V    12              16
TRE_ID_V    13              17
TRE_ID_V    14              18
TRE_ID_V    15              19
TRE_ID_V    16              20
TRE_ID_V    17              21
TRE_ID_O    5500            1     Why the difference between TRE_ID_V and TRE_ID_O? (I found that the <null> value in tre_id_v makes the difference but why?)
Why is there only 1 bucket for TRE_ID_O ?
thanks Rene

Hello Rene,
if only one bucket is existing... you have no histograms or in other words:
One bucket means no histograms. (see also metalink note #175258.1)
-> method_opt => 'FOR ALL COLUMNS SIZE 1', Table and columns statistics. No histogram generated
Why the difference between TRE_ID_V and TRE_ID_O? (I found that the <null> value in tre_id_v makes the difference but why?)Let's have a look at the oracle documentation for DBMS_STATS.GATHER_TABLE_STATS:
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_stats.htm#sthref8129
-> - AUTO : Oracle determines the columns to collect histograms based on data distribution and the workload of the columns.
Is this column TRE_ID_O not used in much queries or only used very infrequently? That would be an explanation
Try to gather the statitics only with data distribution
-> DBMS_STATS.GATHER_TABLE_STATS('NGM101','NGG_BASISCOMPONENT', METHOD_OPT => 'FOR COLUMNS SIZE SKEWONLY tre_id_o');
Btw. you maybe wonder why the null values are not shown in the buckets for column TRE_ID_V:
Have a look here:
http://www.ioug.org/client_files/members/select_pdf/05q2/SelectQ205_Kanagaraj.pdf
-> Before we move on, let us state that histograms are essentially “buckets” that
specify a range of values in a column. The Oracle kernel sorts the non-null
values in the column and groups them into the specified number of these
buckets so that each bucket holds the same number of data points, bounded
by the end point value of the previous bucket.
In the pdf document there are also some sql traces which show how oracle determine the columns, etc..
@ Rob:
As Sybrand already suggested, Oracle already has the statistics that your table contains 944957 rows of which 944940 are NULL for column tre_id_vOk that but i will make no sense... because histograms are created for the column tre_id_v.
Regards
Stefan

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