1. Reduce the Workload:
The best way to realize how the server spends the time is by reducing the workload of the server. By reducing the workload, one can resolve the most difficult queries for tuning. Time is the most important factor, because, when you post a query against the server, you no need to feel more about the processing time of the query.
SQL query runs faster if you write the query as
SELECT id, first_name, last_name, age, subject FROM student_details;
SELECT * FROM student_details;
2. Understand the Fundamental Resources:
A database server requires 4 fundamental resources like CPU, memory, disk and network. If anyone of these goes weak, then the database server may perform slowly. It becomes highly necessary for one to understand the important resources especially in two areas like hardware selection and troubleshooting.
While choosing hardware for My SQL, be clear in choosing the better performing components. In important cases, the addition of memory is the best way to increase the performance. Sometimes, the memory may not be such enough to hold the data of server.
Write query as
SELECT d.dept_id, d.dept FROM dept d WHERE EXISTS (SELECT 'X' FROM employee e WHERE e.dept = d.dept);
SELECT DISTINCT d.dept-id, d.dept FROM dept d, employee e WHERE e.dept = e.dept;
Queues may raise problems for two major causes. It may serialize workload and prevents tasks from parallel execution. It often results in the table which contains work in process as well as historical data. Add latency to the application and load to My SQL.
If you want to use WHERE clause, write a query as follows,
SELECT id, first-name, age FROM Student-details WHERE age>10;
SELECT id, first-name, age FROM Student details WHERE age! =10;
The best way to optimize My SQL is to do cheap. There is a problem with this technique. The formula requires more trigonometric operations. Great circle calculations may run slowly and lead CPU to run slow. Square should contain circle inside so as to make this function easily.
5. Know Two Scalability Traps:
Scalability is not a vague topic. In fact, there are some mathematical definitions which are expressed as equations. Parallel processes should stop for serialization.
