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Oracle SQL Performance 1. ORACLE optimizer:. RULE (based on Rules) B. COST (COST-based) c. CHOOSE (optional) sets the default optimizer. various declarations of the OPTIMIZER_MODE parameter in the ora file, such as RULE, COST, CHOOSE, ALL_ROWS,
The racle database system is a complex software system. Without understanding its internal structure principles and relationships, it is impossible to design and Compile High-Quality application software systems or manage a complex application
Oracle basic concepts and comparison with informix
I. ConceptsUser: informix directly uses the user management system of the operating system. Generally, root and informix are used as super operators to manage other users. Oracle has its own user
[ Oracle-based SQL Optimization ]Oracle-based SQL optimization"Bo Master" Gao Ruilin"Blog Address" http://www.cnblogs.com/grl214
A Written Intent description
In the early stage of the system development, due to less
In Oracle, the most important common method of tree-based query in Oracle is the select... start with... connect by... prior syntax. Based on this syntax, we can list a table structure in the tree order. The following describes the common query
SQL statement optimization improves database performance and SQL statement database performance
In systems with unsatisfactory performance, apart from the fact that the application load exceeds the server's actual processing capacity, it is more
V. Index Optimization Design
1. Manage organization Indexes
The index can greatly accelerate the database query speed. The index maps the logical value in the table to a safe RowID, so the index can quickly locate the physical address of the data.
The most important thing about Oracle tree queries is the Select...start with ... connect by...prior syntax. Depending on the syntax, we can list a table-shaped structure in the order of the tree. Below is a list of common query methods for tree
(1) Select the most efficient table name order (valid only in the rule-based optimizer):The Oracle parser processes the table names in the FROM clause in a right-to-left order, and the FROM clause is written in the final table (the underlying table,
Oracle SQL Performance Optimization
(1) select the most efficient table name sequence (only valid in the rule-based Optimizer ):
The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. The table written in
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