What is the best way to Maximise MySQL query efficiency?

Optimize Queries With MySQL Query Optimization Guidelines

1. Avoid using functions in predicates.
2. Avoid using a wildcard (\%) at the beginning of a predicate.
3. Avoid unnecessary columns in SELECT clause.
4. Use inner join, instead of outer join if possible.
5. Use DISTINCT and UNION only if it is necessary.

How do I optimize a query in MySQL?

10 Answers

1. Add an auto increment field to the table. It looks you wouldn’t delete from the table, so you can use simple math to find the record count.
2. Create another table summarizing the record count for each day. Then you can query that table for the total records.

How do I limit a query in MySQL?

In MySQL the LIMIT clause is used with the SELECT statement to restrict the number of rows in the result set. The Limit Clause accepts one or two arguments which are offset and count. The value of both the parameters can be zero or positive integers.

How does MySQL handle large data?

What I’ve understood so far to improve the performance for very large tables:

1. (for innoDB tables which is my case) increasing the innodb_buffer_pool_size (e.g., up to 80\% of RAM).
2. having proper indexes on the table (using EXPLAN on queries)
3. partitioning the table.
4. MySQL Sharding or clustering.

How do I limit SQL query results?

The SQL SELECT LIMIT statement is used to retrieve records from one or more tables in a database and limit the number of records returned based on a limit value. TIP: SELECT LIMIT is not supported in all SQL databases. For databases such as SQL Server or MSAccess, use the SELECT TOP statement to limit your results.

How do you set a limit in a query?

The limit keyword is used to limit the number of rows returned in a query result. “SELECT {fieldname(s) | *} FROM tableName(s)” is the SELECT statement containing the fields that we would like to return in our query. “[WHERE condition]” is optional but when supplied, can be used to specify a filter on the result set.

How do you handle a large query?