The fast mode threshold is used by the CA ADS runtime system to determine whether record buffers are written to disk or kept in main storage across a pseudo converse. If the total size of all record buffers, in bytes, exceeds the fast mode threshold, the record buffers are written to disk; otherwise, the record buffers are kept in the storage pool.
The size of the threshold is a site-specific determination that is based on the availability of general resources versus the amount of available storage. I/Os for DC/UCF system journaling and CPU cycles for record locking are used when record buffers are written to the scratch/queue areas. Therefore, when buffers exceed the fast mode threshold, the increased use of resources will slow down the transaction response time. On the other hand, if buffers are always under the threshold (that is, if the fast mode threshold is high), more memory is required.
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