Index: openacs-4/packages/acs-core-docs/www/xml/install-guide/maintenance.xml =================================================================== RCS file: /usr/local/cvsroot/openacs-4/packages/acs-core-docs/www/xml/install-guide/maintenance.xml,v diff -u -N -r1.24 -r1.25 --- openacs-4/packages/acs-core-docs/www/xml/install-guide/maintenance.xml 13 Jan 2005 13:55:17 -0000 1.24 +++ openacs-4/packages/acs-core-docs/www/xml/install-guide/maintenance.xml 16 Feb 2005 00:18:52 -0000 1.25 @@ -838,52 +838,7 @@ - - - - Creating an appropriate tuning and monitoring environment - - The first task is to create an appropriate environment for finding out - what is going on inside Oracle. Oracle provides Statspack, a package to - monitor and save the state of the v$ performance views. These reports - help finding severe problems by exposing summary data about the Oracle - wait interface, executed queries. You'll find the installation - instructions in $ORACLE_HOME/rdbms/admin/spdoc.txt. Follow the - instructions carefully and take periodic snapshots, this way you'll be - able to look at historical performance data. - - - - Also turn on the timed_statistics in your init.ora file, so that - Statspack reports (and all other Oracle reports) are timed, which makes - them a lot more meaningful. The overhead of timing data is about 1% per - Oracle Support information. - - - - - To be able to get a overview of how Oracle executes a particular query, - install "autotrace". I usually follow the instructions here http://asktom.oracle.com/~tkyte/article1/autotrace.html. - - - Make sure, that the Oracle CBO works with adequate statistics - - - The Oracle Cost Based optimizer is a piece of software that tries to find - the "optimal" execution plan for a given SQL statement. For that it - estimates the costs of running a SQL query in a particular way (by default - up to 80.000 permutations are being tested in a Oracle 8i). To get an - adequate cost estimate, the CBO needs to have adequate statistics. For - that Oracle supplies the dbms_stats - package. - - - - - - ($Id$) + ($Id$)