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What is query Optimization?

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2008-12-12 10:06:51
2008-12-12 10:06:51

Queries of a database can be fast or slow. Depends on a lot of things. The size of the table, the amount of data you are requesting from the query, etc. One of the ways a dba can help query optimization, is by "updating statistics" on a table. Statistics of a table allows the query to find the most efficient way to gather the data from the table.

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Related Questions


he is the main person for the data administration for the relational database management systems. therefore, he needs to understand the query plan and be able to suggest the suitable query plan that would satisfy the query.


Query processing can be divided into four main phases: decomposition, optimization, code generation, and execution.


The goal of query optimization is to reduce the system resources required to fulfill a query, and ultimately provide the user with the correct result set faster. Query optimization is important for at least a few reasons. First, it provides the user with faster results, which makes the application seem faster to the user. Secondly, it allows the system to service more queries in the same amount of time, because each request takes less time than unoptimized queries. Thirdly, query optimization ultimately reduces the amount of wear on the hardware (e.g. disk drives), and allows the server to run more efficiently (e.g. lower power consumption, less memory usage).


In Heuristic-based Optimization, the query execution is refined based on heuristic rules for reordering the individual operations.


1. Faster processing of query 2. Lesser cost per query 3. High performance of the system 4. Lesser stress on the database 5. Efficient usage of database engine 6. Lesser memory is consumed


Where the 'query tree' or 'algebra tree' is transformed using a set of predefined rules that will improve the queries performance. Performing the selections as early as possible to reduce load. It is a form of Query Processing.


1:parallel execution 2: Additional communication cost 3: Transparency and replication


A. Illarramendi has written: 'Query optimization for KBMSs' -- subject(s): Telos (Computer program knowledge), Database management


A query.A query.A query.A query.A query.A query.A query.A query.A query.A query.A query.


An Update query.An Update query.An Update query.An Update query.An Update query.An Update query.An Update query.An Update query.An Update query.An Update query.An Update query.


A delete query.A delete query.A delete query.A delete query.A delete query.A delete query.A delete query.A delete query.A delete query.A delete query.A delete query.


An optimization is what is compiled by an optimization compiler. An optimization compiler compiles optimizations. You're welcome.


Yes, you can have a query inside a query. That is known as a sub-query.


It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.It is referred to as a parameter query.


Select Query Delete Query Update Query Append Query (SQL Query ) *All queries are SQL Queries, but you can have some that are very unique and take a great detail to write. Crosstab Query Make Table Query Union Query Pass Through Query Data Defintion Query Parameter Query


Optimization is not a need, it is a wish.


It is a query inside another query. Normally it is a select statement inside a query. Sometimes you want to run query and use data from another query in that query. So you will have one query inside another one. The inside or nested query is the subquery.


essential diffrence between global and local optimization


It is a query inside another query. Sometimes we might use one query to reduce down the amount of data to go through and then use another query based on the output of that query to get what you want. The first query is inside or nested in the first query.


A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.A subquery is basically a query inside another query. Sometimes a main query needs to process data that is the result of another query. To extract that data a subquery could be built into a field in a main query. This is known as a subquery.


Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.Yes. That is one of the things that a query is used for.


difference between maximization and optimization


production optimization is increasing the quality&quantity of products


The advantages of OODBMS include; extensibility, expressive query language, improved performance, ability to handle many data types, enriched modelling capabilities and support for long transactions. The disadvantages are as follows; lack of standards, lack of experience, competition, compromised encapsulation due to query optimization and lack of a universal data model.


A query that prompts for input whenever it is run is a Paremeter Query



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