How do you troubleshoot a slow running query?

How do you troubleshoot a slow running query?

Troubleshoot Slow-Running Queries In SQL Server

1. Using SQL Server Profiler. SQL Server Profiler is a separate application that lets you view the queries being run on the SQL Server database engine in real time as they complete.
2. Using Extended Events.
3. Find the Problem.
4. Over Executing NonClustered Indexes.
5. Scans into Seeks.

How do I find slow queries in Oracle?

How to do it…

1. Log in to the SQL database as an administrator.
2. Execute the following SQL query: SELECT * FROM (SELECT sql_fulltext, sql_id, child_number, disk_reads, executions, first_load_time, last_load_time FROM v$sql ORDER BY elapsed_time DESC) WHERE ROWNUM < 10 /

How do I troubleshoot Oracle performance issues?

There are six best practices DBAs should follow when conducting Oracle database performance tuning:

1. Improving SQL execution efficiency.
2. Increasing availability.
3. Managing operating system resources.
4. Optimizing storage performance.
5. Using the query optimizer.
6. Using and configuring memory.

How will you detect a slow running query in stored procedure in SQL Server?

Without further ado, here are seven ways to find slow SQL queries in SQL Server.

1. Generate an Actual Execution Plan.
2. Monitor Resource Usage.
3. Use the Database Engine Tuning Advisor.
4. Find Slow Queries With SQL DMVs.
5. Query Reporting via APM Solutions.
6. SQL Server Extended Events.
7. SQL Azure Query Performance Insights.

How do you find long running queries?

Answer: You can query the v$session_longops view to find long-running queries and you can query the AWR to find historical queries (if you have purchased the AWR packs).. The Oracle data dictionary contains a little-known view called the v$session_longops.

How do I find slow SQL?

How do you resolve a database performance issue?

In many cases, you’ll need to use one or more of these paths to resolve database performance issues.

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.

What is Oracle performance tuning?

Performance tuning is the process of optimizing Oracle performance by streamlining the execution of SQL statements. In other words, performance tuning simplifies the process of accessing and altering information contained by the database with the intention of improving query response times and application operations.

Why is MY SQL Server running so slow?

Sometime the SQL runs fast (< 1 sec) and sometime the SQL response time is slow (> 15 sec). Each server is on a different network. The databases are about 99\% the same with some minor differences. If we open 2 sessions on the same server/database, 1 SQL session will run fast and the other SQL will run slow.

Why is the in clause so slow in Oracle?

The “IN” – clause is known in Oracle to be pretty slow. In fact, the internal query optimizer in Oracle cannot handle statements with “IN” pretty good. try using “EXISTS”: Caution: Please check if the query builds the same data results. Edith says: ooops, the query is not well formed, but the general idea is correct.

Why is MY SQL query taking so long?

Caution: Please check if the query builds the same data results. Edith says: ooops, the query is not well formed, but the general idea is correct. Oracle has to fulfill a full table scan for the second (inner) query, build the results and then compare them to the first (outer) query, that’s why it’s slowing down.

What is the best book on Oracle SQL tuning?

The landmark book “Advanced Oracle SQL Tuning The Definitive Reference” is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30\% off directly from the publisher.