Optimization practice of real-time query and event query in PHP programming

With the development and popularity of Web applications, PHP as a popular programming language has been widely used. However, an important issue in PHP programming is how to optimize queries to improve performance. This article will introduce the optimization practices of instant query and event query in PHP programming, thereby improving the response speed and scalability of the application.

Instant query refers to a query that is executed immediately when the application is running. For example, when the user submits a form, the PHP code sends the query to the database and returns the results. Such queries are often an application bottleneck because they need to be executed in the application's main thread, negatively impacting the application's responsiveness. Here are some suggestions for optimizing immediate queries:

1. Reduce the number of queries

Reducing the number of immediate queries as much as possible is the key to optimizing performance. This can be achieved by:

a. Cache query results: cache the query results in memory so that you do not need to query the database again on subsequent requests.

b. Batch query: merge multiple queries into one query to reduce the number of queries.

c. Use indexes: Using appropriate indexes can improve query speed and thus reduce the number of queries.

2. Optimize query statements

Optimization of query statements can improve query speed, thereby reducing response time. The following are some suggestions for optimizing query statements:

a. Reduce the number of fields in the query: only query necessary fields, not unnecessary fields.

b. Avoid using wildcard characters: Using wildcard characters (such as "%") can make queries slower.

c. Avoid using subqueries: Subqueries are usually slower than simple queries.

d. Avoid using OR: Using OR can make queries slow down.

Event queries refer to queries triggered based on events, such as automatically starting some SQL scripts when users add new data. These queries are executed outside of the response cycle and therefore do not cause bottlenecks in the application. Here are some suggestions for optimizing event queries:

1. Use triggers

Using triggers in the database can simplify event queries and improve the scalability of your application. Triggers are event triggers set in the database, such as when data is inserted, updated, or deleted. By using triggers, there is no need to manually trigger events, and queries are automatically executed when an event occurs. This ensures rapid response to incidents and reduces human error.

2. Optimizing query statements

The optimization method of event query is similar to that of real-time query. The following are some suggestions for optimizing query statements:

a. Cache query results: Use caching as much as possible so that the results do not need to be recalculated when querying.

b. Batch processing: Combine multiple queries into one query.

c. Use indexes: Using indexes can increase query speed, thereby reducing query time.

To sum up, both instant query and event query are important issues in PHP programming. By caching query results, batching queries, using indexes and other optimization methods, the response speed and scalability of the application can be improved. At the same time, when using event queries, using triggers and optimizing query statements can also improve performance.

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