Wednesday, June 11, 2014

Check if statistics out of date

You can use query below to check if statistics are outdated.  From nzsql, connect to a database in particular and run the query below:

nzsql -d database <<eof

SELECT
        "Table Name",
        the_label as "Statistics State",
        count(*)  as "# Of Columns",
  TO_CHAR ( _v_table.reltuples, '999,999,999,999,999') AS "Table Rowcount"
FROM
(
SELECT
                _v_relation_column.name as "Table Name",
                CASE WHEN       _v_statistic.recent IS NULL THEN 'not maintained    '
                ELSE
                CASE WHEN       _v_statistic.recent =    85 THEN 'Full              '
                     WHEN       _v_statistic.recent =   341 THEN 'Express           '
                     WHEN       _v_statistic.recent =   149 THEN 'Basic             '
                     WHEN       _v_statistic.recent =     1 THEN 'Full Min/Max OK   '
                     WHEN       _v_statistic.recent =   257 THEN 'Express Min/Max OK'
                     WHEN       _v_statistic.recent =   129 THEN 'Basic Min/Max OK  '
                     WHEN       _v_statistic.recent =     0 THEN 'Full Outdated     '
                     WHEN       _v_statistic.recent =   256 THEN 'Express Outdated  '
                     WHEN       _v_statistic.recent =   128 THEN 'Basic Outdated    '
                     WHEN       _v_statistic.recent =   169 THEN 'Min/Max Only      '
                     WHEN       _v_statistic.recent =   170 THEN 'Unavailable       '
                     WHEN       _v_statistic.recent = 16554 THEN 'Unavailable       '
                     ELSE       _v_statistic.recent || ''
                     END
                END as the_label,
                _v_relation_column.objid
        FROM
                _v_relation_column
                left outer join _v_statistic on
                (   _v_relation_column.name   = _v_statistic.tablename   AND
                    _v_relation_column.attnum = _v_statistic.attnum
                )
        WHERE
                    _v_relation_column.objid > 200000
                AND upper(_v_relation_column.type) in ('TABLE','SECURE TABLE')
) the_subquery
 LEFT OUTER JOIN _v_table ON the_subquery."Table Name"  =  _v_table.tablename
WHERE trim(the_label) NOT IN ('not maintained','Full','Express','Basic','Unavailable')

GROUP BY "Table Name", "Statistics State", "Table Rowcount"
  ORDER BY "Table Name", "Statistics State";

eof

1 comment:

  1. im seing a new vakue in the "recent" column: =426
    Can anybody perhaps shed some light on what i means ?

    ReplyDelete