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A user process may fail for any number of reasons, including the user exiting abnormally instead of logging out, the terminal rebooting, or the program causing an address violation Whatever the cause of the problem, the outcome is the same The PMON background process periodically polls all the server processes, to ascertain the state of the session If a server process reports that it has lost contact with its user process, PMON will tidy up If the session If a session terminates were in the middle of a transaction, PMON will abnormally, an active transaction will be roll back the transaction and release any locks rolled back automatically Then it will terminate the server process and release the PGA back to the operating system This type of problem is beyond the DBA s control, but he/she should watch for any trends that might indicate a lack of user training, badly written software, or perhaps network or hardware problems
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In conjunction with the network administrators, it should be possible to configure Oracle Net such that there is no single point of failure The three points to consider are listeners, network interface cards, and routes A database listener is unlikely to crash, but there are limits to the amount of work that one listener can do A listener can service only one connect request at a time, and it does take an appreciable amount of time to launch a server process and connect it to a user process If your database experiences high volumes of concurrent connection requests, users may receive errors when they try to connect You can avoid this by configuring multiple listeners, each on a different address/port combination At the operating system and hardware levels, network interfaces can fail Ideally, your server machine will have at least two network interface cards, for redundancy as well as performance Create at least one listener for each card Routing problems or localized network failures can mean that even though the database is running perfectly, no one can connect to it If your server has two or more network interface cards, they should ideally be connected to physically separate subnets Then on the client side configure connect time fault tolerance by listing multiple addresses in the ADDRESS_LIST section of the TNS_NAMEORA entry This will permits the user processes to try a series of routes until they find one that is working
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The network fault tolerance for a single-instance database is only at connect time; a failure later on will disrupt currently connected sessions, and they will have to reconnect In a RAC environment, it is possible for a session to fail over to a different instance, and the user may not even notice
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Historically, user errors were undoubtedly the worst errors to manage Recent releases of the database improve the situation dramatically The problem is that user errors are not errors as far as the database is concerned Imagine a conversation on these lines: User: I forgot to put a WHERE clause on my UPDATE statement, so I ve just updated a million rows instead of one DBA: Did you say COMMIT User: Of course DBA: Um As far as Oracle is concerned, this is a transaction like any other The D for Durable of the ACID test states that once a transaction is committed, it must be immediately broadcast to all other users, and be absolutely non-reversible But at least with DML errors such as the one dramatized here, the user does get the chance to roll back his/her statement if he realizes that it was wrong before committing But DDL statements don t give you that option For example, if a programmer drops a table believing he/she is logged onto the test database but is actually logged onto the production database, there is a COMMIT built into the DROP TABLE command That table is gone you can t roll back DDL Never forget that there is a COMMIT built into DDL statements that will include any preceding DML statements The ideal solution to user errors is to prevent their occurring in the first place This is partly a matter of user training, but more importantly of software design: no user process should ever let a user issue an UPDATE statement without a WHERE clause But even the best-designed software cannot prevent users from issuing SQL that is inappropriate to the business Everyone makes mistakes Oracle provides a number of ways whereby you as DBA may be able to correct user errors, but this is often extremely difficult particularly if the error isn t reported for some time The possible techniques (details of which are beyond the scope of this book) include
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