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SQL> ? show;

SHOW
----

Shows the value of a SQL*Plus system variable, or the current
SQL*Plus environment. SHOW SGA requires a DBA privileged login.

SHO[W] option

where option represents one of the following terms or clauses:
    system_variable
    ALL
    BTI[TLE]
    ERR[ORS] [{FUNCTION | PROCEDURE | PACKAGE | PACKAGE BODY | TRIGGER
        | VIEW | TYPE | TYPE BODY | DIMENSION | JAVA CLASS} [schema.]name]
    LNO
    PARAMETERS [parameter_name]
    PNO
    RECYC[LEBIN] [original_name]
    REL[EASE]
    REPF[OOTER]
    REPH[EADER]
    SGA
    SPOO[L]
    SQLCODE
    TT[ITLE]
    USER

SHOW SPOOL is not available in iSQL*Plus

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http://blog.csdn.net/inthirties/archive/2009/09/13/4547442.aspx



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