Administration Guide

SYSSTAT.FUNCTIONS

Contains a row for each user-defined function (scalar or aggregate). Does not include built-in functions. Statistics are not recorded for inherited columns of typed tables.

Table 125. SYSSTAT.FUNCTIONS Catalog View

Column Name Data Type Nullable Description Updatable
FUNCSCHEMA VARCHAR(128)
Qualified function name.
FUNCNAME VARCHAR(18)

SPECIFICNAME VARCHAR(18)
Function specific (instance) name.
IOS_PER_INVOC DOUBLE
Estimated number of I/Os per invocation; -1 if not known (0 default).
This column can only be updated with the following values:

-1 or >= 0 (zero)
Yes
INSTS_PER_INVOC DOUBLE
Estimated number of instructions per invocation; -1 if not known (450 default).
This column can only be updated with the following values:

-1 or >= 0 (zero)
Yes
IOS_PER_ARGBYTE DOUBLE
Estimated number of I/O's per input argument byte; -1 if not known (0 default).
This column can only be updated with the following values:

-1 or >= 0 (zero)
Yes
INSTS_PER_ARGBYTE DOUBLE
Estimated number of instructions per input argument byte; -1 if not known (0 default).
This column can only be updated with the following values:

-1 or >= 0 (zero)
Yes
PERCENT_ARGBYTES SMALLINT
Estimated average percent of input argument bytes that the function will actually read; -1 if not known (100 default).
This column can only be updated with the following values:

-1 or between 100 and 0 (zero)
Yes
INITIAL_IOS DOUBLE
Estimated number of I/O's performed the first/last time the function is invoked; -1 if not known (0 default).
This column can only be updated with the following values:

-1 or >= 0 (zero)
Yes
INITIAL_INSTS DOUBLE
Estimated number of instructions executed the first/last time the function is invoked; -1 if not known (0 default).
This column can only be updated with the following values:

-1 or >= 0 (zero)
Yes
CARDINALITY BIGINT
The predicted cardinality of a table function. -1 if not known, or if function is not a table function. Yes
SELECTIVITY DOUBLE
Used for user defined predicates. Default = -1.

Column Name	Data Type	Description	Updatable
FUNCSCHEMA	VARCHAR(128)	Qualified function name.
FUNCNAME	VARCHAR(18)
SPECIFICNAME	VARCHAR(18)	Function specific (instance) name.
IOS_PER_INVOC	DOUBLE	Estimated number of I/Os per invocation; -1 if not known (0 default). This column can only be updated with the following values: -1 or >= 0 (zero)	Yes
INSTS_PER_INVOC	DOUBLE	Estimated number of instructions per invocation; -1 if not known (450 default). This column can only be updated with the following values: -1 or >= 0 (zero)	Yes
IOS_PER_ARGBYTE	DOUBLE	Estimated number of I/O's per input argument byte; -1 if not known (0 default). This column can only be updated with the following values: -1 or >= 0 (zero)	Yes
INSTS_PER_ARGBYTE	DOUBLE	Estimated number of instructions per input argument byte; -1 if not known (0 default). This column can only be updated with the following values: -1 or >= 0 (zero)	Yes
PERCENT_ARGBYTES	SMALLINT	Estimated average percent of input argument bytes that the function will actually read; -1 if not known (100 default). This column can only be updated with the following values: -1 or between 100 and 0 (zero)	Yes
INITIAL_IOS	DOUBLE	Estimated number of I/O's performed the first/last time the function is invoked; -1 if not known (0 default). This column can only be updated with the following values: -1 or >= 0 (zero)	Yes
INITIAL_INSTS	DOUBLE	Estimated number of instructions executed the first/last time the function is invoked; -1 if not known (0 default). This column can only be updated with the following values: -1 or >= 0 (zero)	Yes
CARDINALITY	BIGINT	The predicted cardinality of a table function. -1 if not known, or if function is not a table function.	Yes
SELECTIVITY	DOUBLE	Used for user defined predicates. Default = -1.

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