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SQL code:
SQL> show parameter sessions
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
java_max_sessionspace_size integer 0
java_soft_sessionspace_limit integer 0
license_max_sessions integer 0
license_sessions_warning integer 0
logmnr_max_persistent_sessions integer 1
sessions integer 203
shared_server_sessions integer
SQL> alter system set sessions = 300;
alter system set sessions = 300
*
ERROR at line 1:
ORA-02095: specified initialization parameter cannot be modified
SQL> alter system set sessions = 300 scope = spfile;
System altered.
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