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The first number in the - L argument , 3333 , is the port number of your end of the tunnel . ) Preferably , no one else should be using the system at the time . There must be ' <' and '> ' ordering operators having the same left and right input datatypes as the mergejoinable operator itself . The semantics of a rule is that at the time an individual instance is accessed , updated , inserted or deleted , there is a current instance ( for retrieves , updates and deletes ) and a new instance ( for updates and appends ) . groupname The name of an access group into which this account is to be put . This dissuades non-privileged users from guessing the existence of privileged classes . Since there is no problem overloading SQL functions , you can define a set of C functions with different names and then define a set of identically-named SQL function wrappers that take the appropriate argument types and call the matching C function . One implication of this architecture is that the postmaster and the backend always run on the same machine ( the database server ) , while the frontend application may run anywhere . The Corporation 's core business areas are systems integration , aeronautics , space , and technology services . One key difference between Postgres and standard relational systems is that Postgres stores much more information in its catalogs - - not only information about tables and columns , but also information about its types , functions , access methods , and so on . These operators must be named ' <' and '> ' ; you do not have any choice in the matter , since there is no provision for specifying them explicitly .