By Leonid Nossov, Hanno Ernst, Victor Chupis
The goal of SQL tuning is the development of the prevailing execution plan. The authors speak about the elimination of brakes within the execution plan. Such "brakes" or bottlenecks might be well-known by way of a proper research of the execution plan. For this objective no facts version wisdom is required. this is often particularly useful for database directors simply because they're frequently now not or insufficiently accustomed to the information version. The booklet provides a variety of sensible examples with this method.
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Extra resources for Formal SQL Tuning for Oracle Databases: Practical Efficiency - Efficient Practice
That is no small value. We do not know, however, how large the table TA_PROCESS is. ” “The table TA_PROCESS is read by rowid. ” “It’s good that you noticed that. It often happens that a high cardinality only really has an effect in one of the following execution plan steps. "CS_ID") Fig. 6 A nonselective index. ” “That indicates a strong selectivity of these filter predicates. ” “That might solve the problem, but I have one objection to this solution. ” “Yes, if that is possible, as it is in our case.
Some blocks may even be empty. Sparse indexes, their identification, and performance problems which they cause are described in . ” “That can be done by means of optimizer statistics. de/book, functions according to this principle. sql, which needs no optimizer statistics but obtains all necessary data for the calculation itself. This script is more precise than the first one but needs considerably more time and resources. ” “One has to be careful with the index statistic ‘leaf blocks’ because it only takes into account the filled index blocks.
1 The Objective: Effective SQL Tuning The objective of formal SQL tuning is an acceptable performance of a SQL statement. , tuning according to formal rules, enables tuning to be carried out without knowledge of data models. Perhaps this is not so attractive for developers (although developers can also have certain problems with large, complex SQL statements). For database administrators, this method is a key to independent SQL tuning. They are not reliant on developers when performing SQL tuning.
Formal SQL Tuning for Oracle Databases: Practical Efficiency - Efficient Practice by Leonid Nossov, Hanno Ernst, Victor Chupis