DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

Table D-2 PLAN_TABLE contents and brief history
Column Type Content
QUERYNO INTEGER NOT NULL A number intended to identify the
statement being explained.
QBLOCKNO SMALLINT NOT NULL A number that identifies each query
block within a query.
APPLNAME CHAR(8) NOT NULL The name of the application plan for
the row.
PROGNAME CHAR(8) NOT NULL The name of the program or package
containing the statement being
explained.
PLANNO SMALLINT NOT NULL The number of the step in which the
query indicated in QBLOCKNO was
processed.
METHOD SMALLINT NOT NULL A number (0, 1, 2, 3, or 4) that
indicates the join method used for the
step:
0 = First table accessed, continuation
of the previous table.
1= NESTED LOOP JOIN
2= MERGE SCAN JOIN
3 = Sorts needed by ORDER BY,
GROUP BY, SELECT DISTINCT,
UNION,
4= HYBRID JOIN
CREATOR CHAR(8) NOT NULL The creator of the new table accessed
in this step, blank if METHOD is 3.
TNAME CHAR(18) NOT NULL The name of a table, materialized
query table, created or declared
temporary table, materialized view, or
materialized table expression.
TABNO SMALLINT NOT NULL Values are for IBM use only.
410 DB2 UDB for z/OS Version 8 Performance Topics