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

Column Type Content
OPTHINT CHAR(8) NOT NULL WITH DEFAULT A string that you use to identify this
row as an optimization hint for DB2.
DB2 uses this row as input when
choosing an access path.
HINT_USED CHAR(8) NOT NULL WITH DEFAULT If DB2 used one of your optimization
hints, it puts the identifier for that hint
(the value in OPTHINT) in this
column.
PRIMARY_ACCESSTYPE CHAR(1) NOT NULL WITH DEFAULT if direct row access.
- 49 Column Format -----Version 6 -
June 1999
PARENT_QBLOCKNO SMALLINT NOT NULL WITH
DEFAULT
414 DB2 UDB for z/OS Version 8 Performance Topics
- 49 Column Format -Version 6
-June 1999-
A number that indicates the
QBLOCKNO of the parent query
block.
TABLE_TYPE CHAR(1) T table, W work, RB, Q, M, F, C, B...
------ 51 Column Format ----Version
7 --2001---
- 51 Column Format -Version 7-Mar.
2001-
TABLE_ENCODE CHAR(1) The encoding scheme of the table. If
the table has a single CCSID set,
possible values are:
A ASCII
E EBCDIC
U Unicode
M is the value of the column when the
table contains multiple CCSID sets
TABLE_SCCSID SMALLINT NOT NULL WITH
DEFAULT
TABLE_MCCSID SMALLINT NOT NULL WITH
DEFAULT
TABLE_DCCSID SMALLINT NOT NULL WITH
DEFAULT
The SBCS (Single Byte Character
Set) CCSID value of the table. If
column TABLE_ENCODE is M, the
value is 0.
The mixed CCSID value of the table.
Mixed and DBCS (Double Byte
Character Set) CCSIDs are only
available for a certain number of
SBCS CCSIDs, namely, CCSIDs for
Japanese, Korean, and Chinese. That
is, for CCSIDS such as 273 for
Germany, the mixed and DBCS
CCSIDs do not exist.
The DBCS (Double Byte Character
Set) CCSID value of the table. If
column TABLE_ENCODE is M, the
value is 0.
ROUTINE_ID INTEGER Values are for IBM use only.
CTEREF SMALLINT NOT NULL WITH
DEFAULT
If the referenced table is a common
table expression, the value is the
top-level query block number.
STMTTOKEN VARCHAR(240) User specified statement token.