By Leonid Nossov, Hanno Ernst, Victor Chupis
The objective of SQL tuning is the advance of the prevailing execution plan. The authors talk about the removing of brakes within the execution plan. Such "brakes" or bottlenecks might be famous via a proper research of the execution plan. For this function no facts version wisdom is required. this is often specifically worthwhile for database directors simply because they're frequently now not or insufficiently conversant in the information version. The booklet offers various sensible examples with this method.
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Extra info for Formal SQL Tuning for Oracle Databases: Practical Efficiency - Efficient Practice
Yes, once I tuned a database with a lot of direct reads. , not via the buffer cache, more information on this feature can be found in ). I proposed the solution with indexes as a workaround. ” SQL_ID 5p7s1hq62rf59, child number 0 ------------------------------------select count(*) from t1 where a=1 Plan hash value: 3724264953 Id Operation Name 0 SELECT STATEMENT 1 SORT AGGREGATE * 2 TABLE ACCESS FULL T1 Predicate Information (identified by operation id): --------------------------------------------------- Starts 1 1 1 A-Rows 1 1 1 Buffers 185 185 185 2 - filter("A"=1) Fig.
5 Order of operations in the execution plan. An example from J. ” “Very interesting. ” “One could have assumed that because the first subquery does not correlate with the main query and can be executed first for this reason. That can easily be recognized with the runtime statistics. Let’s continue with the runtime statistics. ’ That is the number of data blocks which is respectively read from the buffer cache or from the hard disk or is written on the hard disk. These statistics are cumulative.
In contrast to access, predicates from filter are only used for filtering the rows found. The section “Predicate Information” is very important for formal SQL tuning. • In the section “Column Projection Information,” the tables or index columns which are to be selected in the relevant execution plan step are listed. • The section “Note” contains some additional information, for example, concerning the use of dynamic sampling or cardinality feedback. 4 Approaches to Formal SQL Tuning This is the first of the three chapters in which the formal method is described.