number of index trips

number of index trips specifies the number of times an aged index page traverses the most recently used/least recently used (MRU/LRU) chain before it is considered for swapping out.

Summary Information
Default value	0
Range of values	0–65535
Status	Dynamic
Display level	Comprehensive
Required role	System administrator
Configuration group	Cache Manager

As you increase the value of number of index trips, index pages stay in cache for longer periods of time.

A data cache is implemented as an MRU/LRU chain. As the user threads access data and index pages, these pages are placed on the MRU end of the cache’s MRU/LRU chain. In some high transaction environments (and in some benchmarks), you may want to keep index pages in cache, since they will probably be needed again soon. Setting number of index trips higher keeps index pages in cache longer; setting it lower allows index pages to be swapped out of cache sooner.

You need not set the number of index trips for relaxed LRU pages. See System Administration Guide: Volume 2 > Configuring Data Caches.

Note: If the cache used by an index is relatively small (especially if it shares space with other objects) and you have a high transaction volume, do not set number of index trips too high. The cache can flood with pages that do not age out, and this may lead to the timing out of processes that are waiting for cache space. Before changing the value of number of index trips to a number other than 0, make sure the application has sufficient cache to store all index, OAM, and data pages. Consult SAP Technical Support before changing the value of number of index trips.