SQL> select * from mon$attachments where mon$attachment_id = current_connection;

MON$ATTACHMENT_ID               1209
MON$SERVER_PID                  2792
MON$STATE                       1
MON$ATTACHMENT_NAME             oltp30
MON$USER                        SYSDBA

MON$ROLE                        NONE

MON$REMOTE_PROTOCOL             TCPv4
MON$REMOTE_ADDRESS              192.168.43.96
MON$REMOTE_PID                  1416
MON$CHARACTER_SET_ID            0
MON$TIMESTAMP                   2014-04-09 21:32:54.7370
MON$GARBAGE_COLLECTION          1
MON$REMOTE_PROCESS              C:\MIX\firebird\fb25\bin\isql.exe
MON$STAT_ID                     2
MON$CLIENT_VERSION              <null>
MON$REMOTE_VERSION              P12
MON$REMOTE_HOST                 csprog
MON$REMOTE_OS_USER              ZOTOV
MON$AUTH_METHOD                 Legacy_Auth
MON$SYSTEM_FLAG                 0

SQL> select * from mon$database;

MON$DATABASE_NAME               /var/db/fb30/oltp30.fdb
MON$PAGE_SIZE                   8192
MON$ODS_MAJOR                   12
MON$ODS_MINOR                   0
MON$OLDEST_TRANSACTION          31937
MON$OLDEST_ACTIVE               89088
MON$OLDEST_SNAPSHOT             89088
MON$NEXT_TRANSACTION            89317
MON$PAGE_BUFFERS                524288
 MON$SQL_DIALECT                 3  -- это диалект  базы ; не то.
MON$SHUTDOWN_MODE               0
MON$SWEEP_INTERVAL              0
MON$READ_ONLY                   0
MON$FORCED_WRITES               0
MON$RESERVE_SPACE               1
MON$CREATION_DATE               2014-04-09 14:40:50.0770
MON$PAGES                       5811
MON$STAT_ID                     1
MON$BACKUP_STATE                0
MON$CRYPT_PAGE                  0
MON$OWNER                       SYSDBA

C:\MIX\firebird\OLTPTEST>isql 192.168.0.220/3333:oltp30 -n -sql_ 1

WARNING: This database speaks SQL dialect 3 but Client SQL dialect was set to 1 .
Database:  192.168.0.220/3333:oltp30
SQL> set list on;
SQL> select * from mon$attachments where mon$attachment_id = current_connection;

MON$ATTACHMENT_ID               1211
MON$SERVER_PID                  2792
MON$STATE                       1
MON$ATTACHMENT_NAME             oltp30
MON$USER                        SYSDBA

MON$ROLE                        NONE

MON$REMOTE_PROTOCOL             TCPv4
MON$REMOTE_ADDRESS              192.168.43.96
MON$REMOTE_PID                  1892
MON$CHARACTER_SET_ID            0
MON$TIMESTAMP                    9-APR-2014
MON$GARBAGE_COLLECTION          1
MON$REMOTE_PROCESS              C:\MIX\firebird\fb25\bin\isql.exe
MON$STAT_ID                     2
MON$CLIENT_VERSION              <null>
MON$REMOTE_VERSION              P12
MON$REMOTE_HOST                 csprog
MON$REMOTE_OS_USER              ZOTOV
MON$AUTH_METHOD                 Legacy_Auth
MON$SYSTEM_FLAG                 0