Records the user-specified MAXINTERVAL or MAXVALUELENGTH setting to include when preparing and executing the SQL COLLECT STATISTICS statements on selected statistics or objects.
Definition
REPLACE PROCEDURE TDSTATS.UpdateStatHistogramSettings (IN SCOID BIGINT, IN DatabaseName VARCHAR(128) CHARACTER SET UNICODE, IN TableName VARCHAR(128) CHARACTER SET UNICODE, IN MaxIntervals INTEGER, IN MaxValueLength INTEGER, OUT NumUpdated INTEGER) . . . ;
Input Parameters
| Parameter | Description |
|---|---|
| SCOID | TDSTATS ID of an individual statistic whose histogram settings are to be changed. |
| DatabaseName | Name of the database. DatabaseName limits the new settings applied to all statistics collected within the database you specify. |
| TableName | Name of the table within the specified DatabaseName. TableName limits the new settings to statistics collected on the table you specify within DatabaseName. |
| MaxIntervals | Maximum number of histogram intervals used for collected statistics. A value of -1 indicates the SYSTEM selected value is used. For more information, see the COLLECT STATISTICS MAXINTERVALS option in Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144. |
| MaxValueLength | Maximum size for histogram values. A value of -1 indicates the SYSTEM selected value is used. For information on the valid range of values, see the COLLECT STATISTICS MAXVALUELENGTH option in Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144. |
Usage Notes
The new collection settings will take effect during the next RunCollect operation involving the selected statistics. For more information, see RunCollect.
Updating Statistics
| To update ... | You must specify a value for ... |
|---|---|
| a single statistics collection |
SCOID. This input parameter cannot be NULL.
|
| all statistics for a specified database |
DatabaseName. This input parameter cannot be NULL.
|
| all statistics for a specified table | both DatabaseName and TableName. |
Output Parameter
| Parameter | Description |
|---|---|
| NumUpdated | Number of statistics whose histogram settings have been updated. |
Example: Using UpdateStatHistogramSettings
The following example shows how to specify a MAXINTERVALS value of 500 when collecting statistics on the individual statistic whose TDSTATS database ID is 102.
CALL TDSTATS.UpdateStatHistogramSettings(102, 'Personnel', 'Employee', 500, 0, NumUpdated);
*** Procedure has been executed.
*** Total elapsed time was 1 second.
NumUpdated
-----------
1