QUERY PLAN Meaning and
Definition
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A query plan, in the context of computer science and database management systems, refers to the detailed strategy or blueprint formulated by the database optimizer to execute a database query efficiently. When a user submits a query in a database system, the query optimizer analyzes the query and creates a query plan to determine the most efficient way to retrieve the requested data.
The query plan is essentially a step-by-step outline of the operations and algorithms that the database engine will employ to execute the query. It includes information on which tables and indexes will be accessed, the order in which tables will be joined, and the type of operations that will be performed, such as filtering, sorting, and aggregating. The optimizer evaluates various potential plans and selects the one that minimizes resource consumption and execution time.
A query plan is usually represented in a tree-like structure, known as an execution plan tree or an operator tree, where each node represents an operation like scan, join, sort, or filter. The optimizer estimates the cost of each operation, considering factors such as table sizes, statistics, available indexes, and system resources, to determine the overall cost of the plan.
Database administrators and developers often examine query plans to understand and fine-tune the performance of their queries. By analyzing the query plan, they can identify potential bottlenecks, inefficient operations, or missing indexes, and make adjustments accordingly to enhance the performance of the query execution.
Common Misspellings for QUERY PLAN
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Etymology of QUERY PLAN
The term query plan originates from the field of computer science and database management systems. The word query comes from the Latin word quaerere, meaning to seek, ask, or question. In the context of databases, a query refers to a request for information from a database.
The word plan refers to a detailed proposal or strategy for accomplishing a specific goal or objective. In the context of databases, a query plan is a specific plan or strategy devised by the database management system to execute a particular query efficiently.
Therefore, the etymology of the term query plan is a combination of the Latin word quaerere (query) and the English word plan.
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