Is it any information about commands separated with ‘;’ inside one query – are they atomic or not? I’m interested in actual versions of popular databases: MySQL, MSSQL, SQLite etc? For example, if 100 clients will spam following query:
"insert into test ( name ) values ( '1' ); insert into test ( name ) values ( '2' )"
Will database contains items in sequence ‘1’, ‘2’, ‘1’, ‘2’ etc or it is possible for each command divided by ‘;’ from 100 clients to race each over, resulting in ‘1’, ‘1’, ‘2’, ‘1’, ‘2’, ‘2’, ‘2’ etc ?
Wrap it in a transaction. Otherwise, no, there is in general no guarantee that your statements will be atomic.