oracle sql tuning books

Tags: process optimizer consolidation requires merging auto overwrite session accessThe full execution order of the SELECT statement:The full execution order of the SQL SELECT statement: 1. The FROM clause assembles data from different data sources; 2. The WHERE clause filters the record rows based on the specified criteria, 3, the GROUP BY clause divides the data into multiple groupings, 4, uses the aggregation function for the calculation, 5, uses t

Label:11g new Features-automatic SQL tuning (Automatic SQL Tuning) In Oracle 10g, an automatic SQL Tuning feature was introduced. In addition, ADDM monitors

time and reduce the syntax errors caused by the column ambiguity. 14. Replace distinct with exists:When submitting a query that contains one-to-many table information, avoid using DISTINCT in the SELECT clause. You can generally consider replacing with exists Example: (Low efficiency) Select from where d.dept_no = e.dept_no; Efficient Select from where exists (select1fromwhere d.dept_no = e.dept_no); exists makes queries faster because the RDBMS core module returns results immediately after t

11g new Features-automatic SQL tuning (Automatic SQL Tuning)In Oracle 10g, an automatic SQL Tuning feature was introduced. In addition, ADDM monitors

in 10g, Oracle launched its own SQL optimization aids : SQL Optimizer (SQL Tuning Advisor :STA) , it is the new Dbms_sqltune package. Use the STA to make sure that the optimizer is in CBO mode. but I think that using this tool is only suitable for people who don't understa

rationally;② Historical Data Quick cleanup: ALTER TABLE t truncate partition P1;.Disadvantages:① too many partitions also increase overhead, and in general, tables above the million data level are considered for partitioning.② too many partitions also result in a workload on partition maintenance.4. Index Organization table (index-organized Tables)The table itself is the index, and the index itself is the table. For configuration tables that are rarely updated.Pros: eliminate back tables and ap

different, using Microsoft's previous case library (Northwind) for analysis, part of the content will also be applied to another Microsoft Case Library AdventureWorksTrust the Friends of SQL Server, both libraries are not too unfamiliar.Conceptual understandingThe so-called indexes, like other types of data pages in SQL Server, are fixed 8KB (8192 bytes), stored in the same b-tree structure, and each page

Oracle If you go to a computer bookstore now, you'll find that books related to Oracle technology will occupy a lot of space in bookstores. In these books there are many fine, but certainly some dross mixed with, for fine, we might as well read, for those patchwork of books

Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni