• Unable to log in to an instance.
  • The instance no longer responds to keyboard or mouse commands.
  • Operations seem to run slow or slower than they did before.
  • Slow performance across all or specific applications in the instance.
  • Slow response time when entering data into applications.
  • The graphical user interface (GUI) takes too long to refresh.


  • Network connectivity issues exist.
  • Tables do not have indexes, causing the system to take longer to return results. This is due to the large amounts of data that must be processed.
  • Scripts are stuck in an infinite loop.
  • A script(s) created an inefficient query in the database or is running full table scans on large tables.
  • Nested queries in the MySQL server have brought the database to a halt due to certain conditions.
  • The Java virtual machine (JVM) memory use is high or the memory heap is not big enough to store all the data.
  • A large number of calls are made to the database, causing high disk input/output (I/O) on the database server.
  • The central processing unit (CPU) load on the server is too high.
  • There is a high level of transaction concurrency.


Slow performance can be related to a single cause or a combination of issues. Before analyzing each possible cause, it is important to answer two main questions:

  1. Who is experiencing slow response times?
  2. What applications are affected? 

If slow performance is experienced by:

If the issue continues to exist after following the troubleshooting guidelines:

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Last Updated:2020-02-20 03:10:11