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· OPEN DTASET <dataset name> for <input output appending> in <binary text > mode at POSITION <position> MESSAGE <field> · READ DATASET <dataset name > INTO <field> · CLOSE DATASET <dataset name> · DELETE DATASET <dataset name> TRANSFER <field> to <dataset name> What is the difference between opening a dataset for input, output, appending? · FOR OUTPUT Opens the file for writing if exists it is overwritten if not then it is created. · FOR INPUT Opens an existing file for reading. · FOR APPENDING Opens the file for writing at the end of the file .If it does not exist, it is created, if opened, you return to the end. When an internal table is created, the settings criteria for the value of occurs? The objective of setting the value of an occurs for an internal table is a question of optimization. The following facts should be taken into account when making such decision. 1) The complete data area of a program is 64000 bytes. 2) The initial size declared is kept in roll area (quicker access to program) 3) Data entered that exceeds the initial size stores in the roll file (Slower access to program) You should also analyze the expected volume and access rates before making the decision. Define "Check " statements, how it works? To terminate a single loop pass conditionally, use the CHECK <condition> statement in the statement block of the loop. If the condition is not true, any remaining statements in the current statement block after the CHECK statement are ignored, and the next loop pass starts. <condition> can be any logical expression. Explain Field Group(extract dataset)? An extract dataset consists of a sequence of records. These records may have different structures. All records with the same structure form a record type. You must define each record type of an extract dataset as a field group, using the FIELD-GROUPS statement. FIELD-GROUPS <fg>. This statement defines a field group <fg>. A field group combines several fields under one name. For clarity, you should declare your field groups at the end of the declaration part of your program.