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What are the Data types of the external layer? ACCP, CHAR, CLNT, CUKY,CURR, DATS, DEC, FLTP, INT1,INT2, INT4, LANG, LCHR,LRAW, NUMC, PREC, QUAN,RAW ,TIMS, UNIT, VARC. What are the Data types of the ABAP/4 layer? Possible ABAP/4 data types: C: Character. D: Date, format YYYYMMDD. F: Floating-point number in DOUBLE PRECISION (8 bytes). I: Integer. N: Numerical character string of arbitrary length. P: Amount or counter field (packed; implementation depends on hardware platform). S: Time stamp YYYYMMDDHHMMSS. T: Time of day HHMMSS. V: Character string of variable length, length is given in the first two bytes. X: Hexadecimal (binary) storage. How can we set the tablespaces and extent sizes ? You can specify the extent sizes and the tablespace (physical storage area in the database) in which a transparent table is to be stored by setting the size category and data class. What is a data dictionary ? Data dictionary is a central source of data in a data management system. Its main function is to support the .It has details about - What data is contained ? - What are the attributes of the data ? - What is the relationship existing between the various data elements ? What functions does a data dictionary perform ? In a data management system, the principal functions performed by the data dictionary are - Management of data definitions - Provision of information for evaluation - Support for software development - Support form documentation - Ensuring that the data definitions are flexible and up-to-date. A field containing currency amounts (data type CURR) must be assigned to a reference table and a reference field. Explain. As a reference table, a system table containing all the valid currencies is assigned or any other table which contains a field with the currency key format. This field is called as reference field. The assignment of the field containing currency amounts to the reference field is made at runtime. The value in the reference field determines the currency of the amount.