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November 2017

Quick history on database growth

AWR collects segment statistics, and this can be used to quickly understand an abnormal database growth. Here is a script I use to get, from the AWR history, the segments that have grown by more than 1% of the database size, in one hour.

First I must mention that this uses only the part of AWR which is not subject to additional option. This even works in Standard Edition:
------------------------------------ ----------- ------------------------------
control_management_pack_access string NONE

Pass Summit 2017, 1st Day, Also Known as HumpDay

I’ve plenty of rest after arriving in Seattle yesterday to get my registration for Pass Summit, attended the Women in Technology Happy Hour and then received my Idera ACE!

nVision Performance Tuning: 5. Additional Instrumentation of nVision

This blog post is part of a series that discusses how to get optimal performance from PeopleSoft nVision reporting as used in General Ledger.

One of the challenges of tuning and monitoring nVision is to be able to identify each report being run. Calls to Oracle instrumentation package dbms_application_info  were added to the component processor in PeopleTools 8.50, and to Application Engine in PeopleTools 8.52.  However, COBOL, nVision, and SQR were never instrumented.

SystemTap for PostgreSQL Toolkit


The purpose of this post is to share some SystemTap tools that have been initially written for oracle and have been adapted for PostgreSQL.

The tools are:

  • pg_schedtimes.stp: To track time spend in various states (run, sleep, iowait, queued)
  • pg_page_faults.stp: To report the total number of page faults and splits them into Major or Minor faults as well as Read or Write access
  • pg_traffic.stp: To track the I/O (vfs, block) and Network (tcp, udp, nfs) traffic

Those tools are able to group the SystemTap probes per client connections (per database or user) and server processes.

Grouping the probes

As described into the documentation, on most platforms, PostgreSQL modifies its command title as reported by ps, so that individual server processes can readily be identified.

Parsing freeform data in flat files

SQL loader is a very cool utility that has existed for a long time within Oracle to load flat files into the database. However sometimes people find the control file syntax quite cryptic, and when it comes to passing very complicated structures, this can mean control files which are hard to maintain. For me the best solution here is to use an external table. That way we can combine the power of the SQL Loader control file syntax embedded within the external table definition, along with the full power of PL/SQL and SQL for additional parsing of that data.

Here is an example where the data is spread across multiple lines and the task is to bring all that data together into a natural form, namely an ID followed by text.

So here is my file that has free format text