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

CREATE TYPE 2 INDEX DSN_STATEMENT_CACHE_IDX1
ON DSN_STATEMENT_CACHE_TABLE (STMT_ID ASC) ;
CREATE TYPE 2 INDEX DSN_STATEMENT_CACHE_IDX2
ON DSN_STATEMENT_CACHE_TABLE (STMT_TOKEN ASC)
CLUSTER;
CREATE TYPE 2 INDEX DSN_STATEMENT_CACHE_IDX3
ON DSN_STATEMENT_CACHE_TABLE (EXPLAIN_TS DESC) ;
CREATE AUX TABLE DSN_STATEMENT_CACHE_AUX IN
DSNSTMTC.DSNLOBTS
STORES DSN_STATEMENT_CACHE_TABLE COLUMN STMT_TEXT;
CREATE TYPE 2 INDEX DSN_STATEMENT_CACHE_AUXINX
ON DSN_STATEMENT_CACHE_AUX;
The contents of this new EXPLAIN table are described in Table D-5.
Table D-5 Contents of DSN_STATEMNT_CACHE_TABLE
Column Type Content
STMT_ID Statement ID, EDM unique token
STMT_TOKEN Statement token. User-provided
identification string
COLLID Collection id value is
DSNDYNAMICSQLCACHE
PROGRAM_NAME Program name, Name of package or
DBRM that performed the initial
PREPARE
INV_DROPALT Invalidated by DROP/ALTER
INV_REVOKE Invalidated by REVOKE
INV_LRU Removed from cache by LRU
INV_RUNSTATS Invalidated by RUNSTATS
CACHED_TS Timestamp when statement was
cached
USERS Number of current users of statement.
These are the users that have
prepared or executed the statement
during their current unit of work.
COPIES Number of copies of the statement
owned by all threads in the system
LINES Precompiler line number from the
initial PREPARE
PRIMAUTH User ID - Primary authorization ID of
the user that did the initial PREPARE
CURSQLID CURRENT SQLID of the user that did
the initial prepare
Appendix D. EXPLAIN and its tables 419