xml or database?

i have an announcement part in my project; some administrators will make announcement in web project and others will see this announcement; but this announcement traffic will be very busy maybe it will be over 1000 announcement in few days,

and my question is ; where should i hold this announcement for performance and speed ; which one should i use xml file or database; or for performance and speed what is the number for entries; i mean that;

for example above 1000 entries you must use db for other use xml?

[534 byte] By [Radith] at [2007-12-23]