The allocation of resources for parallel database queries

When you configure the database server, consider how the use of PDQ affects users of OLTP, decision-support (DSS) applications, and other applications. Then you can plan how to allocate resources for PDQ.

When the database server uses PDQ to perform a query in parallel, it puts a heavy load on the operating system. In particular, PDQ exploits the following resources:
  • Memory
  • CPU VPs
  • Disk I/O (to fragmented tables and temporary table space)
  • Scan threads
You can control how the database server uses resources in the following ways:
  • Limit the priority of parallel database queries.
  • Adjust the amount of memory.
  • Limit the number of scan threads.
  • Limit the number of concurrent queries.

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