Discovery performance tuning

You can update the com.collation.discover.dwcount, com.collation.discover.observer.topopumpcount, and com.ibm.cdb.discover.observer.topopump.threshold properties in the collation.properties file to influence the discovery rate and the rate at which the discovery results are stored in the TADDM database, or to limit the number of threads that are responsible for storing data.

For details about these properties, see Performance properties.

If you increase the values of the com.collation.discover.dwcount or com.collation.discover.observer.topopumpcount properties, you might also have to increase the amount of installed memory by increasing the maximum heap size setting for the following Java™ Virtual Machines (JVMs):
For the dwcount property:
  • In a streaming server deployment:
    • Discover
    • DiscoverService
  • In a domain server deployment:
    • Discover
For the topopumpcount property:
  • In a streaming server deployment:
    • StorageService
  • In a domain server deployment:
    • Topology
For more information, see Java Virtual Machine: IBM parameters tuning.

For more information about tuning for discovery performance, see the document titled Tuning Discovery Performance at http://www.ibm.com/software/brandcatalog/ismlibrary/.