explain 실행 결과를 저장할 테이블이 없기 때문에 발생한 에러입니다.

EXPLAIN.DDL을 찾으셔서 실행시키면 됩니다.

db2 -vtf EXPLAIN.DDL

db2 "? SQL0219N"

SQL0219N The required Explain table "<name>" does not exist. 

Explanation:

The Explain facility has been invoked but was unable to find the
required Explain table "<name>". The Explain tables must be
created prior to invoking Explain. 

User Response:

Create the required Explain tables. The SQL Data Definition
Language statements needed to create the Explain tables are
available in the file called EXPLAIN.DDL in the misc directory
under sqllib. 

 sqlcode :  -219

 sqlstate :  42704