HOW DOES DB2 INTERNALLY (PHYSICALLY) STORE THE DATA

Consider the db2 table “MYTABLE” whose TABLESPACE is “TSNAME” and database is “DBNAME”, then where does exactly the data of the table “MYTABLE” gets stored physically and how to identify it.

DB2 physically stores the data in VSAM files (LDS).

The VSAM dataset-name has the format: –

VCAT.DSNDBC.DBNAME.TSNAME.* –> CLUSTER

VCAT.DSNDBD.DBNAME.TSNAME.* –> DATASET

The same can be found out by typing the command ‘DS’ in front of the table name in BMC.

Important SQL CODES and ABEND CODES

SORT JOIN – TO JOIN TWO FILES BASED ON A KEY

KNOW YOUR MAINFRAME

REXX – INITIAL SETUP

DB2 SQL Query to read COMP (COBOL) data stored in CHAR column

DB2 Performance – Using SET vs SYSDUMMY1 table

DB2 Performace – Predicates Processing Order

DB2 External Stored Procedures

DB2 UPDATE QUERY – UPDATE TABLE1 FROM TABLE2 DATA

DB2 PERFORMANCE ISSUE (When using EXISTS)

HOW DOES DB2 INTERNALLY (PHYSICALLY) STORE THE DATA

HOW DO YOU FIND WHO HAS ACTUALLY LOADED THE DB2 TABLE RECENTLY

TERMINATE A STOPPED DB2 UTILITY

SELECT UNIQUE RECORDS USING “GROUP BY”

DB2 and SQL INTERVIEW QUESTIONS

DB2 TIPS

Optimistic Locking vs. Pessimistic Locking

DB2 BIND OPTIONS and ISOLATION

Is SCHEMA name necessary for DYNAMIC QUERY

DB2 SQL – REPLACE CHARACTERS WITH ACCENTS (NON ENGLISH ALPHABETS)