OrientDB supports Transactions. To begin a new transaction use the begin command. Once a transaction is begun to make persistent the changes you have to call the commit command. To abort the changes call rollback command instead.
begin
orientdb> begin
Transaction 1 is running
orientdb> begin
Error: an active transaction is currently open (id=1). Commit or rollback before starting a new one.
orientdb> insert into account (name) values ('tx test')
Inserted record 'Account#9:-2{name:tx test} v0' in 0,004000 sec(s).
orientdb> select from account where name like 'tx%'
---+---------+--------------------
#| RID |name
---+---------+--------------------
0| #9:-2|tx test
---+---------+--------------------
1 item(s) found. Query executed in 0.076 sec(s).
Until the commit all the new records will have a temporary RID with negative numbers.