IBM Books

Administration Guide

SYSSTAT.INDEXES

Contains one row for each index that is defined for a table.

Table 99. SYSSTAT.INDEXES Catalog View
Column Name Data Type Nullable Description Updatable
INDSCHEMA CHAR(8)
Qualified name of the index.
INDNAME VARCHAR(18)

NLEAF INTEGER
Number of leaf pages; -1 if statistics are not gathered.

This column can only be updated with the following values:

  • -1 or > 0 (zero)
Yes
NLEVELS SMALLINT
Number of index levels; -1 if statistics are not gathered.

This column can only be updated with the following values:

  • -1 or > 0 (zero)
Yes
FIRSTKEYCARD INTEGER
Number of distinct first key values; -1 if statistics are not gathered.

This column can only be updated with the following values:

  • -1 or >= 0 (zero)
Yes
FIRST2KEYCARD INTEGER
Number of distinct keys using the first two columns of the index (-1 if no statistics or inapplicable)

This column can only be updated with the following values:

  • -1 or >= 0 (zero)
Yes
FIRST3KEYCARD INTEGER
Number of distinct keys using the first three columns of the index (-1 if no statistics or inapplicable)

This column can only be updated with the following values:

  • -1 or >= 0 (zero)
Yes
FIRST4KEYCARD INTEGER
Number of distinct keys using the first four columns of the index (-1 if no statistics or inapplicable)

This column can only be updated with the following values:

  • -1 or >= 0 (zero)
Yes
FULLKEYCARD INTEGER
Number of distinct full key values; -1 if statistics are not gathered.

This column can only be updated with the following values:

  • -1 or >= 0 (zero)
Yes
CLUSTERRATIO SMALLINT
This is used by the optimizer. It indicates the degree of data clustering with the index; -1 if statistics are not gathered or if detailed index statistics have been gathered.

This column can only be updated with the following values:

  • -1 or between 0 and 100
Yes
CLUSTERFACTOR DOUBLE
This is used by the optimizer. It is a finer measurement of degree of clustering, or -1 if detailed index statistics have not been gathered.

This column can only be updated with the following values:

  • -1 or between 0 and 1
Yes
SEQUENTIAL_PAGES INTEGER
Number of leaf pages located on disk in index key order with few or no large gaps between them. (-1 if no statistics are available.)

This column can only be updated with the following values:

  • -1 or >= 0 (zero)
Yes
DENSITY INTEGER
Ratio of SEQUENTIAL_PAGES to number of pages in the range of pages occupied by the index, expressed as a percent (integer between 0 and 100, -1 if no statistics are available.)

This column can only be updated with the following values:

  • -1 or between 0 and 100
Yes
PAGE_FETCH_PAIRS VARCHAR(254)
A list of pairs of integers, represented in character form. Each pair represents the number of pages in a hypothetical buffer, and the number of page fetches required to scan the index using that hypothetical buffer. (Zero-length string if no data available.)

This column can be updated with the following input values:

  • The pair delimiter and pair separator characters are the only non-numeric characters accepted
  • Blanks are the only characters recognized as a pair delimiter and pair separator
  • Each number entry must have an accompanying partner number entry with the two being separated by the pair separator character
  • Each pair must be separated from any other pairs by the pair delimiter character
  • Each expected number entry must between 0-9 (only positive values)
Yes

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