Dropping all tables, views and the own schema:

CALL SYSPROC.ADMIN_DROP_SCHEMA('SCHNAME', NULL, 'ERRORSCHEMA', 'ERRORTABLE')

Replace  'SCHNAME' to schema name, example for DEPT schema :

CALL SYSPROC.ADMIN_DROP_SCHEMA('DEPT', NULL, 'ERRORSCHEMA', 'ERRORTABLE');

Dropping all tables

db2 -x "select 'drop table ' || rtrim(tabschema) || '.' || rtrim(tabname) || ' '  
       || ';'from syscat.tables where type = 'T' and tabschema='<schema_name>'"

Dropping all Views

db2 -x "select 'drop table ' || rtrim(tabschema) || '.' || rtrim(tabname) || ' '  
       || ';'from syscat.tables where type = 'V' and
       tabschema='<schema_name>'"

Dropping all Views and all Tables

db2 -x "select 'drop table ' || rtrim(tabschema) || '.' || 
          rtrim(tabname) || ' '  || ';'from syscat.tables where tabschema='<schema_name>'"