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Oracle database performance
Updated: 8 hours 25 min ago

Quick documentation for new PeopleSoft DBAs

Tue, 2014-04-22 11:10

I did a quick survey of the latest PeopleSoft manuals to find a set of links to pass on to a couple of coworkers of mine that are interested in doing PeopleSoft DBA work so I thought I’d include the links in a post.  This might give a new PeopleSoft DBA some highlights without having to read the entire manual set.

This page has a nice picture of how the environments connect:

This is the top level URL for the PeopleTools 8.53 documentation:

Another nice architecture diagram:

Nice overview of application development using app designer:

Yet another architecture diagram:

More in depth view of app server and its processes:

Web server with discussion of servlets and jolt:

Nice overview of datamover commands:

Datamover basics

Nice explanation of Oracle connections from PeopleSoft:

Good to know but not very clear explanation:

Important to know but not very clear:


Starting psadmin

Nice run down of config files:

App server menu:

process scheduler menu:

web server menu – I don’t think I’ve ever used this:

- Bobby


Categories: DBA Blogs

SQL*Loader Express bug – not!

Mon, 2014-04-21 15:41

I’m still studying for my Oracle 12c OCP exam and I was trying to run a simple example of using SQL*Loader Express and the first thing I did blew up and I think it is a bug.  When I load a table with one or two columns it works fine, but when I load a table with 3 or 4 columns the last column is not loaded.  Tell me this isn’t a special feature! :)

First I create the table with four columns:

create table test
(a varchar2(20),
 b varchar2(20),
 c varchar2(20),
 d varchar2(20));

Then I create a comma separated values file named test.dat with four values per line:

[oracle@ora12c dpsl]$ cat test.dat

Then I run sql*loader in express mode:

[oracle@ora12c dpsl]$ sqlldr system/xxxxxx table=test

SQL*Loader: Release - Production on Mon Apr 21 07:32:43 2014

Copyright (c) 1982, 2013, Oracle and/or its affiliates.  All rights reserved.

Express Mode Load, Table: TEST
Path used:      External Table, DEGREE_OF_PARALLELISM=AUTO

Table TEST:
  3 Rows successfully loaded.

Check the log files:
for more information about the load.

Then I query the newly loaded table:

ORCL:CDB$ROOT:SYSTEM>select * from test;

A                    B                    D
-------------------- -------------------- --------------------
a                    b                    d
f                    g                    i
j                    k                    m

Queue the mysterious music.  Actually, now that I look at it really it is the third column that is missing.  Maybe it doesn’t work with a column named C.

Sure enough, here it is with column C replaced with column X:

A                    B                    X                    D
-------------------- -------------------- -------------------- --------------------
a                    b                    c                    d
f                    g                    h                    i
j                    k                    l                    m

So, I guess SQL*Loader Express doesn’t work with columns named C?  Odd.

- Bobby

Update on 05/16/2014:

As you probably can expect, this was user error on my part.  My standard header for sqlplus scripts has this code:

column u new_value us noprint;
column n new_value ns noprint;
column c new_value cs noprint;
select name n from v$database;
select user u from dual;

I use this code to build a prompt that will tell me which container I’m in like this:

set sqlprompt &ns:&cs:&us>

But, this means I can’t use columns named n, u, or c, but in my sql*loader test I was using c.  So, not a bug, just a user error!

- Bobby

Categories: DBA Blogs

ORA-00600 [3631] recovering pluggable database after flashback database in Oracle 12c

Wed, 2014-04-16 15:44

I was trying to recreate the scenario where a 12c container database is flashed back to a SCN before the point that I recovered a pluggable database to using point in time recovery.

I got this ugly ORA-00600:

RMAN> recover pluggable database pdborcl;

Starting recover at 16-APR-14
using channel ORA_DISK_1

starting media recovery
media recovery failed
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 04/16/2014 06:07:40
ORA-00283: recovery session canceled due to errors
RMAN-11003: failure during parse/execution of SQL statement: alter database recover if needed
 datafile 32 , 33 , 34 , 35
ORA-00283: recovery session canceled due to errors
ORA-00600: internal error code, arguments: [3631], [32], [4096], [4210689], [], [], [], [], [], [], [], []

I think the above error message stems from this bug:

Bug 14536110  ORA-600 [ktfaput: wrong pdb] / crash using PDB and FDA

There may have been some clever way to recover from this but I ended up just deleting and recreating the CDB through DBCA which was good experience playing with DBCA in Oracle 12c.  I’m trying to learn 12c but I have a feeling that I have hit a bug that keeps me from testing this flashback database, point in time recovery of a pluggable database scenario.  I wonder if I should patch?  I think that Oracle has included a patch for this bug in a patch set.  It could be good 12c experience to apply a patch set.

- Bobby

Categories: DBA Blogs

Using test prep software to prepare for 12c OCP upgrade exam

Tue, 2014-04-15 17:54

I got the newly available Kaplan test prep software for the Oracle 12c OCP upgrade exam.

I took the test in certification mode when I was tired at the end of the day some day last week and got 44% right – fail!  I usually wait until I get all the questions right before taking the real test so I have a ways to go.

The practice test software has been useful  in terms of showing me things I didn’t study very well or at all.  I’m expecting to significantly improve my correct answer percentage on my next pass.

I’m a little nervous though because it seems that the real test involves some questions that are generic database questions and I don’t think that the test prep software includes that section.  If you look at the list of topics they have a  section called “Key DBA Skills”.  I’d hope that after 19 years as an Oracle DBA I’d have some skills, but there are plenty of things I don’t do every day, such as setting up ASM.  I guess I’ll just have to bone up on the key areas of pre-12c that I don’t use all the time and hope I’m not surprised.

Anyway, I’m at 44% but hoping to make some strides in the new few weeks.

- Bobby


Categories: DBA Blogs