### Abstract

This paper describes a study of different approximation techniques used to predict the response times of database transactions represented as patterns of resource consumption and modelled with non-product-form queueing networks. The techniques are applied to a range of examples. The experiments show that none of the approximation techniques has a consistent advantage over the others for all cases considered. On the other hand, a simple heuristic rule is formulated which provides an acceptable approximation to the average transaction response time for the entire range of examples. The rule specifies a procedure for labelling each queue in a queueing network as either an M/M/1 or an M/G/1 resource. The resulting network can then be solved to obtain the mean response time of individual transactions.

Original language | English |
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Pages (from-to) | 241-250 |

Number of pages | 10 |

Journal | Computer Journal |

Volume | 42 |

Issue number | 3 |

Publication status | Published - 1999 |

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## Cite this

*Computer Journal*,

*42*(3), 241-250.