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To make life a little easier, have ready all the information necessary to properly configure your routers, before you start the process With very simple network configurations, this information may be nothing more than a name for the router, some passwords, a couple of TCP/IP addresses, and a subnet mask For networks that are more elaborate, you will need information specific to the routing protocols on the network, as well as a host of other items The following preconfiguration checklist covers a basic TCP/IP installation: Router host name

Even though the operation releases some locks early, it must retain enough locks to ensure that no other transaction is allowed to execute any con icting operation (such as reading the inserted value or deleting the inserted value) For this reason, the B+ -tree concurrency-control protocol in Section 169 holds locks on the leaf level of the B+ -tree until the end of the transaction Now let us consider how to perform transaction rollback If physical undo is used, that is, the old values of the internal B+ -tree nodes (before the insertion operation was executed) are written back during transaction rollback, some of the updates performed by later insertion or deletion operations executed by other transactions could be lost Instead, the insertion operation has to be undone by a logical undo that is, in this case, by the execution of a delete operation Therefore, when the insertion operation completes, before it releases any locks, it writes a log record <Ti , Oj , operation-end, U >, where the U denotes undo information and Oj denotes a unique identi er for (the instance of) the operation For example, if the operation inserted an entry in a B+ -tree, the undo information U would indicate that a deletion operation is to be performed, and would identify the B+ -tree and what to delete from the tree Such logging of information about operations is called logical logging In contrast, logging of old-value and new-value information is called physical logging, and the corresponding log records are called physical log records The insertion and deletion operations are examples of a class of operations that require logical undo operations since they release locks early; we call such operations logical operations Before a logical operation begins, it writes a log record <Ti , Oj , operation-begin>, where Oj is the unique identi er for the operation While the system is executing the operation, it does physical logging in the normal fashion for all updates performed by the operation Thus, the usual old-value and new-value information is written out for each update When the operation nishes, it writes an operation-end log record as described earlier.

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