WebLogic Server: Logging the SOAP action in the access.log

WebLogic Server allows you to customize your access.log. This can be very powerful if you want to monitor for example service response times in a tool like Splunk (see here). When working with SOAP services though, especially those with many operations, it can be insufficient to monitor services to the level of the individual endpoint. You want to also know with which intent the endpoint is called. In this blog I will show (more...)

Not Another Post Configuring HugePages for Oracle on Linux (x86-64)


Test case is only for one database instance on server.

DB is using memory_target.

SQL> show parameter use_large_pages

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
use_large_pages                      string      TRUE

SQL> show parameter sga

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
lock_sga                             boolean     FALSE
pre_page_sga                         boolean     FALSE
sga_max_size                         big integer 768M
sga_target                           big integer 0

SQL> show parameter pga

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
pga_aggregate_target                 big integer 0

SQL> show parameter target

NAME                                 TYPE        VALUE
------------------------------------  (more...)

Check Oracle Preinstallation/Validated RPM Logs

Quick and dirty note to self.

Grid Infrastructure Installation Guide

Check the RPM log file to review the system configuration changes. For example:

Oracle Linux 6:

Oracle Linux 5 and Oracle Linux 4:

Here are the results for 12c with Oracle Linux 6
[root@arrow1 ~]# cd /var/log/oracle-rdbms-server-12cR1-preinstall/
[root@arrow1 oracle-rdbms-server-12cR1-preinstall]# ls
backup results
[root@arrow1 oracle-rdbms-server-12cR1-preinstall]# ll *
total 8
drwx——. 2 root root 4096 Apr 26 (more...)

WebLogic Server: Automate obtaining performance metrics from the DMS

Oracle provides the Dynamic Monitoring Service (DMS) as part of WebLogic Server which is extremely useful if you want to obtain aggregated data of an environment in case of for example a performance test. The data which can be obtained from DMS is extensive. This varies from average duration of service calls to JVM garbage collects to datasource statistics. DMS can be queried with WLST. See for example here. On example script based on this (more...)


First, any backup implementation should have recovery point and time objective.

Next, there’s no right or wrong, just what fits the requirements.

FILESPERSET controls maximum number of files for each backupset.
MAXPIECESIZE controls maximum size of backuppiece.
MAXSETSIZE controls maximum size of backupset.

Typically, if MAXSETSIZE is set it should be equal to or greater than maximum size of all data files.
In general, it is not recommended to set MAXSETSIZE.

Backupset can contains 1 (more...)

dgmgrl from OS command line

Quick and dirty post from what I just learned.

Who said you can’t teach old dogs new tricks!

$ dgmgrl / "show database hawka"
DGMGRL for Linux: Version - 64bit Production

Copyright (c) 2000, 2009, Oracle. All rights reserved.

Welcome to DGMGRL, type "help" for information.

Database - hawka

  Role:            PRIMARY
  Intended State:  TRANSPORT-ON

Database Status:

$ dgmgrl / "show database hawkb"
DGMGRL for  (more...)

Oracle Data Guard Broker and Static Service Registration (Doc ID 1387859.1)

This is a quick and dirty note to self about Doc ID 1387859.1 which may be incorrect for Single Instance Database with Oracle Restart.

Please share if you have configuration for Single Instance Database with Oracle Restart using DataGuard Broker and listener registered from Grid – TIA.

Oracle Data Guard Broker and Static Service Registration (Doc ID 1387859.1)	


Single Instance Database with Oracle Restart


Online Redo Log Switching from RMAN Backup

I was troubleshooting backup from standby databases and encountered an oddity which I wanted to verify.

Backing Up Archived Redo Logs with RMAN

Before beginning the backup, RMAN switches out of the current redo log group, and archives all online redo logs that have not yet been archived, up to and including the redo log group that was current when BACKUP command with any of the following clauses:


Virtual Development Server: Provide Docker images in docker registry for Oracle XE Database and others

For later creation of containers as needed in the deployment process we have first to build docker images whenever we do not find suitable one in docker hub.

For most of my development I need a oracle database. On the internet you can find a lot of Dockerfile’s for this, but no ready image. This is because for running a database you have to accept a license and this happens when you download the installation (more...)

New Version Of XPLAN_ASH Utility

A new version 4.23 of the XPLAN_ASH utility is available for download.

As usual the latest version can be downloaded here.

This version comes only with minor changes, see the change log below.

Here are the notes from the change log:

- Finally corrected the very old and wrong description of "wait times" in the script comments, where it was talking about "in-flight" wait events but that is not correct. ASH performs a "fix-up" (more...)


Why you might want to think twice about using INSERT ALL.

One of those things I knew and then forgot.

So, let’s say you’ve got three tables or a partitioned table or something like that.

Let’s use regional tables for simplicity.

drop table t1_r1;
drop table t1_r2;
drop table t1_r3;

create table t1_r1
(col1 varchar2(2) not null
,col2 number not null
,check( col1 in ('R1')));

create table t1_r2
(col1 varchar2(2) not null
,col2 number not  (more...)

PROCESSED Messages not clearing from Oracle Queue

I was contacted by Dev team to look into Development database where Oracle queue size kept  on increasing. As per them messages were not getting cleared.They were running count on Queue table and the count kept increasing. To find out exact cause I included the msg_state in the query and found out that there were…

APEX 5.0 Beyond basics

iAdvise presented the APEX 5.0 roadshows in the first half of 2015. Besides the presentation about the new features, we provided 3 tutorials which helped the visitors to explore Oracle Application Express 5.0. Now we offer these tutorials through our blog. In this article the second tutorial is presented.

This tutorial helps you step by step through the process of migrating an application to the Universal Theme of Oracle Application Express 5.0. In this tutorial we talk about (more...)

MRP process on standby stops with ORA-00600

A rather not so great post about an ORA-00600 error i faced on a standby database. Environement was on Sun Super Cluster machine. MRP process was hitting ORA-00600 while trying to apply a specific archive log.

The error message was something like this

MRP0: Background Media Recovery terminated with error 600
Errors in file /u01/app/oracle/product/
ORA-00600: internal error code, arguments: [2619], [539], [], [], [], [], [],  (more...)

ORA-22926 when using getClobVal to convert XMLType to CLOB

I ran into a problem the other day when moving some code from one database to another (both XE 11g). The code in question needs to convert an XMLType to a CLOB to do some (hacky) string manipulation on it, and then turn it back to an XMLType.

Here's the original code:

  l_xml := apex_web_service.make_request(...);
  -- little hack to remove bad empty namespace from result
  l_clob := l_xml.getClobVal();

ORA-01873 error running SAP pre-upgrade scripts

While trying to run pre_upgrade_status.sql script for DB upgrade ( to, we got following error @pre_upgrade_status.sql ERROR at line 1: ORA-01873: the leading precision of the interval is too small ORA-06512: at line 8 On debugging further , found out that it was due to limit imposed on "INTERVAL DAY TO SECOND" datatype. By…

LGWR terminating instance due to error 338

Recently we came across a issue where our DB crashed with ORA-00338 error . Errors in file /oracle/diag/rdbms/orcl11g/orc11g/trace/orc11g_lgwr_24118.trc: ORA-00338: log 2 of thread 1 is more recent than control file ORA-00312: online log 2 thread 1: '/oracle/oradata/orcl11g/redo02.log' LGWR (ospid: 24118): terminating the instance due to error 338 DB couldn't be restarted as it gave same errors…

Permissions for both HDFS and local fileSystem paths

| Jul 18, 2014

Hi All,

Permission issues is one of the key error , while setting up Hadoop Cluster, while debugging some error found below table on http://hadoop.apache.org/ . It’s a good scorecard to keep handy.


Permissions for both HDFS and local fileSystem paths

The following table lists various paths on HDFS and local filesystems (on all nodes) and recommended permissions:

Filesystem Path User:Group Permissions
local dfs.namenode.name.dir hdfs:hadoop drwx——
local dfs.datanode.data.dir (more...)

Rolling upgrads using logical standby database.

Couple of weeks ago there was a Twitter discussion started by Martin Bach (@MartinDBA) about cases for logical standby implementation. A rolling upgrade was mentioned by Tim Gorman (@timothyjgormanas) as one of potential recommendations for using this rare use product. I have been involved in such project in the past and I prepared an instruction and did quite large number of rolling upgrades from 11.1 into 11.2.

There are couple of my “gotchas”

Oracle Direct NFS and Infiniband: A Less-Than-Perfect Match

Readers of an earlier post on this blog will know about my latest forays into the world of Direct NFS. Part of that means stumbling over configuration hiccups or slamming into brick walls when you find new bugs.

To quickly re-set the table, my organization purchased the Oracle ZFS Storage Appliance (ZFSSA) 7420. Oracle sold us on the Infiniband connectivity as a way to make a possible future transition to Exadata easier. However the pre-sales (more...)