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Appending Records Insertions to the end of the le, APPEND operations, are frequent To make them more e cient they are handled di erently from other insert operations in some systems If the address of the last block of the le is known the performance of APPEND operations can be improved, since then the locate step is not needed This address can be kept as a pointer in the directory Furthermore, a sequence of APPEND operations may be performed without successive READ and REWRITE operations, since a block needs to be written only when full or when a batch of appends is completed New blocks, allocated to extend the le, do not have to be read The relative frequency of encountering a block boundary, which determines the frequency of block writes remaining when appending, is 1/Bfr When a single transaction performs only one append, no bene ts are derived from batching Other considerations argue also against batching of appends When batching append operations an intervening failure of the computer system will cause multiple appends to be lost If these APPEND operations are part of distinct transactions, batching of appends violates the integrity constraints of a transactions if the computer fails The all-or-nothing consistency condition given for transactions hence requires a REWRITE of the block when the transaction is to be committed In the analyses that follow we ignore the di erence of appends and general insertions and assume that a READ and a REWRITE of a block is done for every type of insert For applications which append frequently separate evaluations which consider the bene ts of not requiring to locate the record, and perhaps on batching as well, could be made
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Deleting records is the inverse of insertion After locating the record, the space that it occupied should be freed for reuse Maintenance of clustering may require again that other records be shifted Often deletion is not performed immediately, but instead the record to be deleted is marked with an indicator that this record is now invalid The delete is now converted to an update A marker may be set in a special eld containing {valid, invalid}, or the old record space may be lled with NULL characters, or a message such as * Deleted *; is placed in the record We will refer to such a marker as a tombstone We make sure that the tombstone will t even within the smallest record permissible in the le, so that rewriting of the old record is easy We do not cover the performance of deletion operations explicitly, and treat record deletion either with insertion or with update of records, as appropriate All changes of data do not require insertion of a new record When data within a stored record must be changed, the new, updated record is created using the remaining data from the previous record The old data and the changes are merged to create a new record, the new record is inserted into the position of the old record within the block, and the block is rewritten into the le If the record has grown in size, it may not be possible to use the old position The old record will then have to be deleted, perhaps with a tombstone, and a new record inserted in an alternate appropriate place Records in the look-up le shown in Table 3-2 will grow in size if a prerequisite is added For a variable spanned organization two blocks will have to be read, updated, and rewritten whenever the record spans blocks Again, the frequency of that event is again 1/Bfr
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