recreate sequence g; commit;
recreate table t(id int, s01 varchar(8), s02 varchar(8));
commit;

select current_timestamp dts,'start' msg from rdb$database;
set stat on;
set term ^;
execute block as
declare n int = 100000000;
declare i int = 0;
begin
  while (i<n) do begin

     insert into t(id,s01,s02) --, b01, b02)
     values(  :i
             ,rpad('', 8, uuid_to_char(gen_uuid()))
             ,rpad('', 8, uuid_to_char(gen_uuid()))
            );
     if (mod(i,1000000)=0) then i=i+0*gen_id(g,1000000);

     i=i+1;
  end
end ^
set term ;^
commit;
select current_timestamp dts, 'done' msg from rdb$database;

 attach #1 
$ isql localhost/3330:/var/db/fb30/tmp_30813_extents.fdb
SQL> update t set s01=s02, s02=s01; -- уходит в себя на минут 10
 
attach #2  (пока молотил attach #1)
SQL> set list on;
SQL> commit; select * from mon$attachments where  mon$user containing 'writer' ;

MON$ATTACHMENT_ID               292
MON$SERVER_PID                  8882
MON$STATE                       0
MON$ATTACHMENT_NAME             /var/db/fb30/tmp_30813_extents.fdb
 MON$USER                        Cache Writer                                                                      
MON$ROLE                        <null>
MON$REMOTE_PROTOCOL             <null>
MON$REMOTE_ADDRESS              <null>
MON$REMOTE_PID                  <null>
MON$CHARACTER_SET_ID            0
MON$TIMESTAMP                   2013-12-30 20:18:16.2360
MON$GARBAGE_COLLECTION          1
MON$REMOTE_PROCESS              <null>
MON$STAT_ID                     11
MON$CLIENT_VERSION              <null>
MON$REMOTE_VERSION              <null>
MON$REMOTE_HOST                 <null>
MON$REMOTE_OS_USER              <null>
MON$AUTH_METHOD                 <null>


SQL> commit; delete from mon$attachments where mon$attachment_id<>current_connection;
SQL> commit; select * from mon$attachments where  mon$user containing 'writer' ;
SQL>  -- no rows! -- 

SQL> show version;
ISQL Version: LI-T3.0.0.30813 Firebird 3.0 Alpha 2
Server version:
Firebird/Linux/AMD/Intel/x64 (access method), version "LI-T3.0.0.30813 Firebird 3.0 Alpha 2"
Firebird/Linux/AMD/Intel/x64 (remote server), version "LI-T3.0.0.30813 Firebird 3.0 Alpha 2/tcp (oel64)/P13:C"
Firebird/Linux/AMD/Intel/x64 (remote interface), version "LI-T3.0.0.30813 Firebird 3.0 Alpha 2/tcp (oel64)/P13:C"
on disk structure version 12.0
SQL> show database;
Database: localhost/3330:/var/db/fb30/tmp_30813_extents.fdb
        Owner: SYSDBA
PAGE_SIZE 4096
Number of DB pages allocated = 1804832
Sweep interval = 20000
Forced Writes are ON
Transaction - oldest = 478
Transaction - oldest active = 539
Transaction - oldest snapshot = 539
Transaction - Next = 551
ODS = 12.0
Default Character set: NONE

$ isql -q
SQL> create database 'tmp.fdb'; commit;
SQL> create table t(id int); commit; quit;
$ isql localhost/3330:/var/db/fb30/tmp.fdb
Database:  localhost/3330:/var/db/fb30/tmp.fdb
SQL> insert into t(id) select 1 from rdb$types,rdb$types,rdb$types,rdb$types,rdb$types; -- ушло в себя, переключаемся во второе окно

 attach #2 
$ isql localhost/3330:/var/db/fb30/tmp.fdb
SQL> set list on;
SQL> commit; select * from mon$attachments where mon$user containing 'writer';
-- вывод поскипан --
SQL> commit; delete from mon$attachments where mon$attachment_id<>current_connection;

Statement failed, SQLSTATE = 08003
connection shutdown
-internal Firebird consistency check (record disappeared (186), file: vio.cpp line: 3468)

SQL> commit; select * from mon$attachments where mon$user containing 'writer';
Statement failed, SQLSTATE = XX000
internal Firebird consistency check (can't continue after bugcheck)
Statement failed, SQLSTATE = XX000
internal Firebird consistency check (can't continue after bugcheck)

oel64   Mon Dec 30 22:19:33 2013
        Database: /var/db/fb30/tmp.fdb
        connection shutdown
        internal Firebird consistency check (record disappeared (186), file: vio.cpp line: 3468)

oel64   Mon Dec 30 22:19:57 2013
        Database: /var/db/fb30/tmp.fdb
        PP 140733193388261 (seq 1) have ppg_dp_full 0x00 while DP have 0x02


oel64   Mon Dec 30 22:19:59 2013
        Database: /var/db/fb30/tmp.fdb
        Pointer page (sequence 74) inconsistent in table T (128)


oel64   Mon Dec 30 22:19:59 2013
        Database: /var/db/fb30/tmp.fdb
        Page 198 is an orphan -- и далее 100500 млн таких же орфанов.