Updating reference tables mysql terry bradshaw dating
At Pantheon, website performance is our priority, so when a client asked me to investigate why his site was slow, I decided to document the story to share with all of our users.
To begin, we must first define performance as response time.
Requesting or waiting for a table system lock (either internal or external).
SHOW PROFILE statements will be in this state for lock requests only.
STATUS = 'M'; Query OK, 0 rows affected (0.00 sec) Rows matched: 0 Changed: 0 Warnings: 0 In this query I have set indexes for all msm.match No, ms.match No, ms.status, msm.status, and msm.member No.
Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community.
Join them; it only takes a minute: Sign up query to successfully execute, due to the process getting stuck on "Sending Data" state.
What could this "Sending data" bottleneck possibly be? I'm not perfectly sure but I think that that query must have locked everything down and put all other queries in queue.
STATUS = 'M'; Query OK, 0 rows affected (0.00 sec) Rows matched: 0 Changed: 0 Warnings: 0 mysql UPDATE match Session Members msm JOIN match Sessions ms ON msm.match No = ms.match No AND ms. Why is this query taking so long to execute even though there aren't any rows actually being updated? I had a different super slow query that ran every hour or so, one update query that was taking over 30 seconds to execute.
Keeping this in mind, a website with a higher response time can have multiple causes, starting from DNS issues, waiting for slow external services (various APIs, third party libraries), slow disk write operations, running crons on HTTP requests and ending with database problems.