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Oracle Sample Questions ›› Oracle PL/SQL

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Oracle Sample Questions : Oracle PL/SQL

  1. What is PL/SQL?

    Answer: PL/SQL is Oracle's Procedural Language extension to SQL.PL/SQL's language syntax, structure and data types are similar to that of ADA.

    The language includes object oriented programming techniques such as encapsulation, function overloading, information hiding.

  2. How can I protect my PL/SQL source code?

    Answer: PL/SQL V2.2, available with Oracle7.2, implements a binary wrapper for PL/SQL programs to protect the source code.

    This is done via a standalone utility that transforms the PL/SQL source code into portable binary object code (somewhat larger than the original).This way you can distribute software without having to worry about exposing your proprietary algorithms and methods.SQL*Plus and SQL*DBA will still understand and know how to execute such scripts.Just be careful, there is no "decode" command available.

    The syntax is:

    wrap iname=myscript.sql oname=xxxx.plb

  3. Can one read/write files from PL/SQL?

    Answer: Included in Oracle 7.3 is a UTL_FILE package that can read and write files.The directory you intend writing to has to be in your INIT.ORA file.
    Before Oracle 7.3 the only means of writing a file was to use DBMS_OUTPUT with the SQL*Plus SPOOL command.

    DECLARE

    fileHandler UTL_FILE.FILE_TYPE;

    BEGIN

    fileHandler := UTL_FILE.FOPEN('/home/oracle/tmp', 'myoutput', 'W');

    UTL_FILE.PUTF(fileHandler, 'Value of func1 is %s\n', func1(1));

    UTL_FILE.FCLOSE(fileHandler);

    END;

  4. Can one use dynamic SQL within PL/SQL?

    Answer: From PL/SQL V2.1 one can use the DBMS_SQL package to execute dynamic SQL statements.
    Eg:

    CREATE OR REPLACE PROCEDURE DYNSQL AS

    cur integer;

    rc integer;

    BEGIN

    cur := DBMS_SQL.OPEN_CURSOR;

    DBMS_SQL.PARSE(cur, 'CREATE TABLE X (Y DATE)', DBMS_SQL.NATIVE);

    rc := DBMS_SQL.EXECUTE(cur);

    DBMS_SQL.CLOSE_CURSOR(cur);

    END;

  5. How does one get the value of a sequence into a PL/SQL variable?

    Answer: select sq_sequence.NEXTVAL into :i from dual;

  6. Is there a PL/SQL Engine in SQL*Plus?

    Answer: No.All your PL/SQL are send directly to the database engine for execution.

  7. Is there a limit on the size of a PL/SQL block?

    Answer: Currently, the maximum parsed/compiled size of a PL/SQL block is 64K and the maximum code size is 100K.You can run the following select statement to query the size of an existing package or procedure.

    SQL> select * from dba_object_size where name = 'procedure_name'

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