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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.
What else can I help you with?
Why DBA understand query optimization?
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.
What is the main four phases of query processing in dbms?
Query processing can be divided into four main phases: decomposition, optimization, code generation, and execution.
How you Explain heuristics-based optimization in a distributed database system?
In Heuristic-based Optimization, the query execution is refined based on heuristic rules for reordering the individual operations.
What is the goal of query optimization Why it is important?
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).
If we think that the DBA is never interested in running his or her own queries does the DBA still need to understand query optimization Why?
Yes, a DBA still needs to understand query optimization, even if they are not directly running queries themselves. This knowledge enables them to design and maintain databases efficiently, ensuring optimal performance for users and applications. Additionally, understanding query optimization helps DBAs troubleshoot performance issues and guide developers in writing efficient queries, ultimately benefiting the entire system's performance.
What is heuristic optimization?
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.
Why would you want to override automatic query optimization?
Sometimes, the query designer may know information that can be overlooked by the query optimizer. Often, in the course of testing queries, one may find that it is actually faster not to use a certain index or to use a different index. When this is the case, database management systems such as Oracle include a facility to override the query optimizer, called query hints.
Why global query optimization is difficult in distributed dbms?
1:parallel execution 2: Additional communication cost 3: Transparency and replication
What has the author A Illarramendi written?
A. Illarramendi has written: 'Query optimization for KBMSs' -- subject(s): Telos (Computer program knowledge), Database management
Why database system support data manipulation using a declarative query languages?
Declarative query languages allow users to specify what data they want without specifying how to retrieve it. This abstraction simplifies the querying process and allows for optimization by the database system to determine the most efficient way to execute the query. It also enhances portability and adaptability by separating the query logic from the database structure.
What are the advantages of query optimization?
Query optimization enhances database performance by reducing execution time and resource consumption, which leads to faster response times for users. It minimizes unnecessary data processing and network traffic by selecting the most efficient query execution plan. Additionally, optimized queries can improve overall system scalability, allowing databases to handle larger workloads without degradation in performance. This ultimately results in a better user experience and more efficient use of server resources.
What is QUERY REWRITE?
Query rewrite is a database optimization technique where the original query is transformed into a more efficient form before execution. This process can involve simplifying the query, changing the order of operations, or substituting equivalent expressions to enhance performance. By doing so, it minimizes resource usage and improves response times, making the retrieval of data more efficient. Query rewriting is often employed by database management systems to optimize complex queries automatically.
