Take a look into TIME-WAIT (sometimes spelled like TIME_WAIT by netstat utility) TCP/IP state: https://tools.ietf.org/html/rfc793 http://www.serverframework.com/asynchronousevents/2011/01/time-wait-and-its-design-implications-for-protocols-and-scalable-servers.html Net effect of how TCP/IP protocol works is that one client can generate about 500 database connections per second and then it [client] will … Continue reading
Last edited 1-Sept-2016 For quite a time I have been a happy user of SPM(SQL Plan Management) to resolve SQL performance issues by using a lazy man’s approach and Oracle capabilities: in the latest versions Oracle will generate many SQL plans … Continue reading
Adding more on 8-Sept-2016: Adding more on 2-Sept-2016: Time to throw a few notes about Oracle database on Amazon RDS. It works Issues getting access to data files: file system access is generally forbidden on RDS for reasons understandable. However, … Continue reading
Just execute select sys.dbms_metadata.get_ddl(‘USER’, ‘USER1′) from dual; to get the new fancier “identified by values” syntax – remember, Oracle has changed and made stronger database user passwords. The old “identified by values” won’t work anymore.
if lgwr latency is more important than throughput then as of 188.8.131.52(and 3) consider the following: – apparently log_buffer size governs group commit batch size. A bigger log buffer means bigger write batch size which means longer session waits on … Continue reading
1. Collect explorer ********************** Run explorer in the following manner : /opt/SUNWexplo/bin/explorer -w default The explorer data collector may be obtained from : http://www.oracle.com/us/support/systems/premier/services-tools-bundle-sun-systems-163717.html Download from : https://support.us.oracle.com/oip/faces/secure/km/DocumentDisplay.jspx?id=1153444.1 Useful documents on explorer : Oracle Explorer Data Collector – Product Information … Continue reading