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A database is mapped into a number of different les, which are maintained by the underlying operating system These les reside permanently on disks, with backups on tapes Each le is partitioned into xed-length storage units called blocks, which are the units of both storage allocation and data transfer We shall discuss in Section 116 various ways to organize the data logically in les A block may contain several data items The exact set of data items that a block contains is determined by the form of physical data organization being used (see Section 116) We shall assume that no data item spans two or more blocks This assumption is realistic for most data-processing applications, such as our banking example A major goal of the database system is to minimize the number of block transfers between the disk and memory One way to reduce the number of disk accesses is to keep as many blocks as possible in main memory The goal is to maximize the chance that, when a block is accessed, it is already in main memory, and, thus, no disk access is required Since it is not possible to keep all blocks in main memory, we need to manage the allocation of the space available in main memory for the storage of blocks The buffer is that part of main memory available for storage of copies of disk blocks There is always a copy kept on disk of every block, but the copy on disk may be a version

CHAPTER 13:

The McGraw Hill Companies, 2001

Fig 3-8 The circuit used in Example 3-2

of the block older than the version in the buffer The subsystem responsible for the allocation of buffer space is called the buffer manager

.

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Programs in a database system make requests (that is, calls) on the buffer manager when they need a block from disk If the block is already in the buffer, the buffer manager passes the address of the block in main memory to the requester If the block is not in the buffer, the buffer manager rst allocates space in the buffer for the block, throwing out some other block, if necessary, to make space for the new block The thrown-out block is written back to disk only if it has been modi ed since the most recent time that it was written to the disk Then, the buffer manager reads in the requested block from the disk to the buffer, and passes the address of the block in main memory to the requester The internal actions of the buffer manager are transparent to the programs that issue disk-block requests If you are familiar with operating-system concepts, you will note that the buffer manager appears to be nothing more than a virtual-memory manager, like those found in most operating systems One difference is that the size of the database may be much more than the hardware address space of a machine, so memory addresses are not suf cient to address all disk blocks Further, to serve the database system well, the buffer manager must use techniques more sophisticated than typical virtualmemory management schemes: Buffer replacement strategy When there is no room left in the buffer, a block must be removed from the buffer before a new one can be read in Most operating systems use a least recently used (LRU) scheme, in which the block that was referenced least recently is written back to disk and is removed from the buffer This simple approach can be improved on for database applications Pinned blocks For the database system to be able to recover from crashes ( 17), it is necessary to restrict those times when a block may be written back to disk For instance, most recovery systems require that a block should not be written to disk while an update on the block is in progress A block that is not allowed to be written back to disk is said to be pinned Although many operating systems do not support pinned blocks, such a feature is essential for a database system that is resilient to crashes Forced output of blocks There are situations in which it is necessary to write back the block to disk, even though the buffer space that it occupies is not needed This write is called the forced output of a block We shall see the reason for forced output in 17; brie y, main-memory contents and thus buffer contents are lost in a crash, whereas data on disk usually survive a crash.

The goal of a replacement strategy for blocks in the buffer is to minimize accesses to the disk For general-purpose programs, it is not possible to predict accurately

6/5

The McGraw Hill Companies, 2001

11

FIGURE 13-8

for each tuple b of borrower do for each tuple c of customer do if b[customer-name] = c[customer-name] then begin let x be a tuple de ned as follows: x[customer-name] := b[customer-name] x[loan-number] := b[loan-number] x[customer-street] := c[customer-street] x[customer-city] := c[customer-city] include tuple x as part of result of borrower end end end Figure 115 Procedure for computing join

Fig 3-9 Since the resistors in Fig 3-8 are connected in parallel, the circuit can be replaced by this equivalent circuit