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stead should request the database system to force-output the buffer blocks The database system in turn would force-output the buffer blocks to the database, after writing relevant log records to stable storage Unfortunately, almost all current-generation operating systems retain complete control of virtual memory The operating system reserves space on disk for storing virtual-memory pages that are not currently in main memory; this space is called swap space If the operating system decides to output a block Bx , that block is output to the swap space on disk, and there is no way for the database system to get control of the output of buffer blocks Therefore, if the database buffer is in virtual memory, transfers between database les and the buffer in virtual memory must be managed by the database system, which enforces the write-ahead logging requirements that we discussed This approach may result in extra output of data to disk If a block Bx is output by the operating system, that block is not output to the database Instead, it is output to the swap space for the operating system s virtual memory When the database system needs to output Bx , the operating system may need rst to input Bx from its swap space Thus, instead of a single output of Bx , there may be two outputs of Bx (one by the operating system, and one by the database system) and one extra input of Bx Although both approaches suffer from some drawbacks, one or the other must be chosen unless the operating system is designed to support the requirements of database logging Only a few current operating systems, such as the Mach operating system, support these requirements

Until now, we have considered only the case where a failure results in the loss of information residing in volatile storage while the content of the nonvolatile storage remains intact Although failures in which the content of nonvolatile storage is lost are rare, we nevertheless need to be prepared to deal with this type of failure In this section, we discuss only disk storage Our discussions apply as well to other nonvolatile storage types The basic scheme is to dump the entire content of the database to stable storage periodically say, once per day For example, we may dump the database to one or more magnetic tapes If a failure occurs that results in the loss of physical database blocks, the system uses the most recent dump in restoring the database to a previous consistent state Once this restoration has been accomplished, the system uses the log to bring the database system to the most recent consistent state More precisely, no transaction may be active during the dump procedure, and a procedure similar to checkpointing must take place: 1 Output all log records currently residing in main memory onto stable storage 2 Output all buffer blocks onto the disk

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7 Normalization of Relational Tables 231 reason to split a table just because it has multiple candidate keys Splitting a table with mul tiple candidate keys can slow query performance due to extra joins You can use the simple synthesis procedure to analyze simple dependency structures Most tables resulting from a conversion o f an E R D should have simple dependency struc tures because the data modeling process has already done much o f the normalization process Most tables should be nearly normalized after the conversion process For complex dependency structures, you should use a commercial design tool to perform normalization To make the synthesis procedure easy to use, some o f the details have been omitted In particular, step 2 can be rather involved because there are more ways to derive dependencies than transitivity Even checking for transitivity can be difficult with many columns The full details o f step 2 can be found in references cited at the end o f the chapter Even if you understand the complex details, step 2 cannot be done manually for c o m p l e x dependency structures For complex dependency structures, you need to use a C A S E tool even if y o u are an experienced database designer

In the following sections, we will discuss the various hardware and software components of a working router Also, we will step through basic installation procedures and try out various TCP/IP router configurations that illustrate several common configuration options

The McGraw Hill Companies, 2001

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