On 17/07/2003 10:01 Fabian Kreitner wrote:

Hi Fabian,

When you are doing these kinds of tests, you need to be aware that the kernel may have most of your data cached after the first query and this may be why the second query appears to run faster.

Also don't be worried if the planner chooses a seq scan for small tables as the whole table can often be bought into memory with one IO whereas reading the index then the table would be 2 IOs. HTH

Paul Thomas
| Thomas Micro Systems Limited | Software Solutions for the Smaller Business |
| Computer Consultants | http://www.thomas-micro-systems-ltd.co.uk |

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