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35 36 CHAPTER 3 Query Optimization and Plan Selection Finally, we use sequential block accesses (SBA) and random block accesses (RBA) as estimators for I/O time since there is a linear relationship between SBA or RBA and I/O time, and I/O time is a generally accepted form of cost comparison in database operations. Option 1A Cost Estimation: Brute-force Method of Doing All Joins First, with No Indexes We summarize the basic sizes of records, counts of records, and counts of blocks accessed sequentially in the following table.
DB2 Design Advisor: Integrated Automatic Physical Database Design. VLDB 2004, Toronto, Canada, 1087-1097. 13 This page intentionally left blank 2 Basic Indexing Methods If you don’t find it in the index, look very carefully through the entire catalogue. , Consumer’s Guide, 1897 T he concept of indexing for dictionaries, encyclopedias, book manuscripts, catalogs, and address lists has been around for centuries. Methods like tabs in a book volume or lists of index terms at the back of the book are used very effectively.
A rewrite of a row just read tends to be a random block access in a shared disk environment, which we assume here. For the simple case of updating data values in a particular row, assume that each index node is implemented as a block. 4 where a block access is assumed to be an access to an individual block (or page) in a shared disk environment. 2). The need for a split is recognized after the initial search for the row has been done. A split of an leaf index node requires a rewrite of the saturated leaf index node, half filled with data, plus a write of a new leaf index node also half filled, plus a rewrite of the nonleaf index node with a new pointer value to the new leaf index node.
Advances in Computers, Vol. 13