you need to use whatever mechanism your servlet container has for shuting down cleanly -- depending on how you started tomcat, that might be hitting Ctrl-C in a terminal, or it might be running a "stop" command.
: I did a full import and put adaptive parameter for mySql to avoid OOM error. If you did something to avoid an OOM error that suggests maybe you recently had an OOM error -- in that case your index may have been left in an unusable state. i thought the fsync additions to the version of Lucene in Solr 1.3 prevented situations like this (ensuring that your index was still usable, even if some documents were lost) but i also seem to recall you mentioning recently you were using an older nightly build of Solr -- and/or maybe that feature doesn't work on certain fileseystems you're using. I'm not sure but i thought i'd mention it. -Hoss
