[lemma=to] | [!(lemma=place | □)]? □ | □
[lemma=to] | [!(lemma=place | □=□)]? □ | □
[lemma=to] | [!(lemma=place | □ | □)]? □ | □
Some of the switches explained here can be passed to the backend through the " database options " field of a connection request , and thus can be set for a particular backend without going to the trouble of restarting the postmaster . But the secretary can setup another view and grant access to that to public . The test script will report any difference as a " failure " , but the difference might be due to small cross-system differences in error message wording , math library behavior , etc. Error messages can come from either the Postgres code or from the host platform system routines . The person who executes this command becomes the database administrator , or DBA , for this database and is the only person , other than the Postgres super-user , who can destroy it . This option improves performance , but an operating system crash while a transaction is in progress may cause the loss of the most recently entered data . Postgres stores these types in only one way ( within the file that stores all instances of the class ) but the user can " look inside " at the attributes of these types from the query language and optimize their retrieval by ( for example ) defining indices on the attributes . And this is still the situation when the original query is already a join over views . The catalogs appear to the user as classes , like any other , but the DBMS stores its internal bookkeeping in them . Postgres has a cache , but the majority of a big table will not fit in the cache .