Asked by: Lesbia Kalbskopf
technology and computing databases

How do I make my SQL code more efficient?

Last Updated: 8th May, 2020

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Below are 23 rules to make your SQL faster and more efficient
  1. Batch data deletion and updates.
  2. Use automatic partitioning SQL server features.
  3. Convert scalar functions into table-valued functions.
  4. Instead of UPDATE, use CASE.
  5. Reduce nested views to reduce lags.
  6. Data pre-staging.
  7. Use temp tables.
  8. Avoid using re-use code.

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Hereof, how can I improve my database performance?

5 Easy Ways To Improve Your Database Performance

  1. Optimize Queries. In most cases, performance issues are caused by poor SQL queries performance.
  2. Create optimal indexes.
  3. Get a stronger CPU.
  4. Allocate more memory.
  5. Data defragmentation.
  6. Disk Types.
  7. Database version.

Also, how can I make MySQL query run faster? Let's have a look at the most important and useful tips to improve MySQL Query for speed and performance.

  1. Optimize Your Database.
  2. Optimize Joins.
  3. Index All Columns Used in 'where', 'order by', and 'group by' Clauses.
  4. Use Full-Text Searches.
  5. Optimize Like Statements With Union Clause.
  6. MySQL Query Caching.

Subsequently, one may also ask, what are the different ways to optimize a SQL query?

It's vital you optimize your queries for minimum impact on database performance.

  1. Define business requirements first.
  2. SELECT fields instead of using SELECT *
  3. Avoid SELECT DISTINCT.
  4. Create joins with INNER JOIN (not WHERE)
  5. Use WHERE instead of HAVING to define filters.
  6. Use wildcards at the end of a phrase only.

Which join is faster in SQL?

Well, in general INNER JOIN will be faster because it only returns the rows matched in all joined tables based on the joined column. But LEFT JOIN will return all rows from a table specified LEFT and all matching rows from a table specified RIGHT.

Related Question Answers

Cyril Babkoff

Professional

How do I make my query run faster?

Below are 23 rules to make your SQL faster and more efficient
  1. Batch data deletion and updates.
  2. Use automatic partitioning SQL server features.
  3. Convert scalar functions into table-valued functions.
  4. Instead of UPDATE, use CASE.
  5. Reduce nested views to reduce lags.
  6. Data pre-staging.
  7. Use temp tables.
  8. Avoid using re-use code.

Cristiam Balada

Professional

What affects database performance?

There are five factors that influence database performance: workload, throughput, resources, optimization, and contention. It is a combination of online transactions, batch jobs, ad hoc queries, business intelligence queries and analysis, utilities, and system commands directed through the DBMS at any given time.

Joycelyn Eisenbletter

Professional

What is database optimization?

Database optimization involves maximizing the speed and efficiency with which data is retrieved. Database designers, administrators and analysts work together to optimize system performance through diverse methods.

Suiping Perschel

Explainer

What is SQL optimization?

Query optimization is the overall process of choosing the most efficient means of executing a SQL statement. SQL is a nonprocedural language, so the optimizer is free to merge, reorganize, and process in any order. The database optimizes each SQL statement based on statistics collected about the accessed data.

Enemesio Krebber

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What is database efficiency?

From Wikipedia, the free encyclopedia. Data efficiency refers to efficiency of the many processes that can be applied to data such as storage, access, filtering, sharing, etc., and whether or not the processes lead to the desired outcome within resource constraints.

Aira Ciocoiu

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How do you optimize a query?

Follow the SQL best practices to ensure query optimization:
  1. Index all the predicates in JOIN, WHERE, ORDER BY and GROUP BY clauses.
  2. Avoid using functions in predicates.
  3. Avoid using wildcard (%) at the beginning of a predicate.
  4. Avoid unnecessary columns in SELECT clause.
  5. Use inner join, instead of outer join if possible.

Amando Stinga

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What is the purpose of the PDO :: errorInfo () data?

PDO::errorInfo() only retrieves error information for operations performed directly on the database handle. If you create a PDOStatement object through PDO::prepare() or PDO::query() and invoke an error on the statement handle, PDO::errorInfo() will not reflect the error from the statement handle.

Concesina Pfutzenreuter

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How does Oracle utilize memory to speed up processes?

Oracle Database In-Memory adds a column store to the traditional row store, an addition that significantly speeds up both analytic queries and complex transaction processing. Its dual-format approach simultaneously organizes data in both rows, for optimal transaction performance, and columns, for high speed analytics.

Mahmud Mugueta

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Why query optimization is needed?

Importance: 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. Secondly, it allows the system to service more queries in the same amount of time, because each request takes less time than unoptimized queries.

Geza Gaspari

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What is SQL Indexing?

An index is an on-disk structure associated with a table or view that speeds retrieval of rows from the table or view. These keys are stored in a structure (B-tree) that enables SQL Server to find the row or rows associated with the key values quickly and efficiently.

Vasudeva Dodenhofft

Pundit

How do I perform a performance tuning in SQL Server?

To tune the performance of your SQL Server, you should avoid such loops in your code. Instead, you can modify the code by using a unique INSERT or UPDATE statement with multiple rows and values: Do keep it in mind to ensure that the WHERE clause does not update the stored value if it matches the existing value.

Airidas Alcarazo

Teacher

What are views in SQL?

In SQL, a view is a virtual table based on the result-set of an SQL statement. The fields in a view are fields from one or more real tables in the database. You can add SQL functions, WHERE, and JOIN statements to a view and present the data as if the data were coming from one single table.

Wava Meyeroff

Teacher

How do I query optimization in MySQL?

Even if you optimize your MySQL queries and fail to come up with a good database structure, your database performance can still halt when your data increases.
  1. Normalize Tables.
  2. Use Optimal Data Types.
  3. Avoid Null Values.
  4. Avoid Too Many Columns.
  5. Optimize Joins.
  6. Setting the MySQL Server Query Cache.

Chada Rucktaschler

Teacher

How does SQL query work?

A T-SQL statement (query) tells SQL Server what you want but does not tell it how to do. When SQL Server receives a query it applies a number of processes, which work on that query. The first two things the server does on any submitted query is parsing and optimization.

Yanina Hassler

Teacher

What is SQL performance tuning?

In a nutshell, SQL performance tuning consists of making queries of a relation database run as fast as possible. As you'll see in this post, SQL performance tuning is not a single tool or technique. Rather, it's a set of practices that makes uses of a wide array of techniques, tools, and processes.

Goretti Gravert

Reviewer

How does SQL store data?

The disk space allocated to a data file is logically divided into pages which is the fundamental unit of data storage in SQL Server. A database page is an 8 KB chunk of data. When you insert any data into a SQL Server database, it saves the data to a series of 8 KB pages inside the data file.

Marth Kunel

Reviewer

What do you mean by query?

A query is a request for data or information from a database table or combination of tables. This data may be generated as results returned by Structured Query Language (SQL) or as pictorials, graphs or complex results, e.g., trend analyses from data-mining tools.

Rubialejos Bernhofen

Reviewer

What is slow query in MySQL?

Enabling the MySQL slow query log. Slow queries can affect database performance and overall server performance. The slow query log feature in MySQL enables you to log queries that exceed a predefined time limit. By default, when the slow query log is enabled, it logs any query that takes longer than 10 seconds to run.

Kathia FaƱanas

Reviewer

Why is MySQL running slow?

Server is slow due to high CPU usage caused by the "mysql" process. Websites that are using MySQL databases operate slow. Database dump takes too much time to complete.