Can please you send me the SQL script that SQL*Plus actually runs for SHOW SGA command? When you issue SHOW SGA...
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in SQL*Plus, then it runs the following SQL statement for you:
SELECT name,value FROM v$sga;
However, the first line of output from SHOW SGA is the following SQL statement:
SELECT 'Total System Global Area',SUM(value) FROM v$sga; Performing a UNION ALL ties it all together: SELECT 'Total System Global Area',SUM(value) FROM v$sga UNION ALL SELECT name,value FROM v$sga;
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