Implementing ORAchk in Oracle Enterprise Manager 13c

Heard about it at Oracle OpenWorld 2015: A new feature in Oracle Enterprise Manager 13c is the possibility to incorporate ORAchk, the healthcheck tool for databases, RAC and Engineered Systems.

This post is about downloading (and importing), deploying and provisioning the ORAchk-plugin. Spoiler-alert: there’s downtime involved of the OMS.

There are two ways for downloading and deploying : offline-patching and on-line, which means whether OEM is connected to My Oracle Support or not. In this (more...)

Recover from ORA-01172 & ORA-01151

This morning I was working on an Oracle Management Repository (OMR) for a test Enterprise Manager that is used by a few consultants I work with. When I logged into the box, I found that the OMR was down. When I went to start the database, I was greeted with ORA-01172 and ORA-01151.

These errors basically say:

ORA-01172 – recovery of thread % stuck at block % of file %
ORA-01151 – use media recovery (more...)

Using SKIP LOCKED feature in DB Adapter polling

Last few days I spent with describing a Throttle mechanism using the DB Adapter. Today the 'Distributed Polling' functionality of the DB Adapter was mentioned to me, which uses the SKIP LOCKED clausule of the database.

On one of the pages you'll get to check the 'Distributed Polling' option:
Leave it like it is, since it adds the 'SKIP LOCKED' option in the 'FOR UPDATE' clausule.

In my example screendump I set the Database Rows (more...)

NoCOUG Journal Column – February 2016 Issue

In the February 2016 issue of the NoCOUG Journal, for the Many Things Oracle column, I discuss some of the v$ views that are lesser known or not widely used. I also touch up on the MGMTDB cluster repository database in Oracle Clusterware 12c. Read here… This is a Collector’s Edition, and includes the several good articles […]

Oracle Apex 5.0 and APEX_JSON

How many lines of code does it take to make a web service call? Answer: 39

That is how many lines of PL/SQL I had to write in Oracle Apex 5.0 to make a web service call to an external API.

I used Adzuna's REST API to retrieve the latitude and longitude and the price of 2 bed properties for rent in a specific location in UK. The API returns JSON which the APEX_JSON (more...)

Apply DB OVJM PSU + Queryable Patch Inventory Demo

Oracle started releasing OVJM component of  DB PSU in October 2014, and recommend applying OVJM PSU along with (or after) DB PSU. I will demo applying DB PSU, and OVJM PSU on database. Use this opportunity to introduce you to Queryable Patch Inventory (DBMS_QOPATCH), where you can query OPatch information directly from the database. […]

Why ALL Tools in at Your Disposal ARE IMPORTANT

After my AWR Warehouse session at DOAG in Nuremberg, Germany last week, an attendee asked me if he really needed to use trace files anymore with the value provided by AWR, (Automatic Workload Repository) and ASH, (Active Session History.)  I responded that trace files were incredibly valuable and should never be discounted.

To use an analogy, when I was 22 years old, and entered a doctor’s office missing a small percentage of my visual (more...)


This blog post is inspired on work I have been doing on Standard Edition databases and the returning confusion about what is and what is not part of Standard Edition.

DBA_FEATURE_USAGE_STATISTICS is a tool in determining license usage for the Oracle database. It is good to understand the implications of each entry, know what is happening in your database and thus be able to have a substantial conversation about the usage of your license, being (more...)

MOS Tools for Proactive DBA!

As a DBA, you must be familiar with the various tools provided by My Oracle Support (MOS) for diagnostics and health check. Here are few every DBA must be familiar with, which will help you when everyone else in the organization is jumping on you to resolve a failure or troubleshoot a performance issue. 1513912.2 […]

@HrOUG_2015 in Rovinj, Croatia

In a hectic year it is good to attend and contribute to Oracle user group sessions. This adds an element of a ‘Working Holiday’ to someones schedule. I can promise you, the vacation isle of Rovinj is a perfect venue for this and especially since it is the last week of the opening of the Hotel for this season.
Of course you can find all information about contributing to these events right here!!

@HrOUG_2015, (more...)

Oracle Open World and Oak Table World Schedule!

So I’ll be heading out for Oracle Open World 2015 in just over another week.  This is the first year in a while that I won’t be speaking, (my own fault, as dummy here hasn’t figured out how to submit sessions internally yet, duh!)   but I’m still going to support the demo grounds, meet with customers and speak at Oak Table World!


Per Steve Karam, if you need to know who’s speaking and (more...)

Critical Background Processes in Oracle Database 12c

There are several background processes running when you start Oracle Database 12c instance. Here is an example from one of the instances.    ora_acms_bt9prod1  ora_lreg_bt9prod1 ora_p00w_bt9prod1  ora_aqpc_bt9prod1  ora_m000_bt9prod1  ora_p00x_bt9prod1  ora_asmb_bt9prod1  ora_mark_bt9prod1  ora_p00y_bt9prod1  ora_cjq0_bt9prod1  ora_mman_bt9prod1  ora_p00z_bt9prod1  ora_ckpt_bt9prod1  ora_mmnl_bt9prod1  ora_ping_bt9prod1  ora_dbrm_bt9prod1  ora_mmon_bt9prod1  ora_pmon_bt9prod1  ora_dbw0_bt9prod1  ora_o000_bt9prod1  ora_ppa6_bt9prod1  ora_dbw1_bt9prod1  ora_p000_bt9prod1  ora_ppa7_bt9prod1  ora_dbw2_bt9prod1  ora_p001_bt9prod1  ora_psp0_bt9prod1  ora_dbw3_bt9prod1  ora_p002_bt9prod1  ora_pxmn_bt9prod1  ora_dbw4_bt9prod1 […]

Restoring a Database to a New Diskgroup

I had the pleasure of rebuilding an Exadata rack for a customer a while back, and it provided a pretty good refresher in backup and recovery for me.  As DBAs, we back up databases all the time, but the restores are performed much less frequently.  In the case of this rack, there were several databases across multiple ASM diskgroups.  One of the goals of the rebuild was to consolidate all of the databases into a (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...)

Oracle’s ASM Filter Driver Revisited


Almost exactly a year ago I published a post covering my first impressions of the ASM Filter Driver (ASMFD) released in Oracle, followed swiftly by a second post showing that it didn’t work with 4k native devices.

When I wrote that first post I was about to start my summer holidays, so I’m afraid to admit that I was a little sloppy and made some false assumptions toward the end – assumptions (more...)

Introducing FETCHER in a running replication process

This is no regular bit of work and it will probably (and hopefully) never hit you in a production setup…

The prerequisite is that you know how on-line data replication in general, and Dbvisit Replicate specifically, work.

The following case is true:
I had half of a replication pair running.
It means that the MINE process was running, converting REDO-log in PLOG-format. The APPLY process had not yet started because the target database was (more...)

Query existing HBase tables with SQL using Apache Phoenix

Spending a bit more time with Apache Phoenix in my previous post I realised that you can use it to query existing HBase tables. That is NOT tables created using Apache Phoenix, but HBase - the columnar NoSQL database in Hadoop.

I think this is cool as it gives you the ability to use SQL on an HBase table.

To test this, let's say you login to HBase and you create an HBase table like (more...)

HAIP and Exadata

If you’ve run an exachk report, y0u may have seen the following message with regard to your databases:

Status Type Message Status On Details
FAIL Database Check Database parameter CLUSTER_INTERCONNECTS is NOT set to the recommended value db01:dbm011, db02:dbm012 View

This check is commonly seen when a database is created on Exadata without using the custom “Exadata” templates included with the database creation assistant.  These customized templates include a multitude of recommended parameter settings found in (more...)

Kscope15, a celebration of tech…

Kscope15 promised to be a brand new experience in more than one way.

Kscope15LogoAs I start to write this report, I am flying from Düsseldorf airport to Atlanta. It will be the first time flying to the United States with a stopover, and because of Erik van Roon, I came prepared. With just carry-on luggage, I should end up at my final destination, Fort Lauderdale, Florida, together with my ‘stuff’. I am flying Delta (more...)

Annonce : Oracle Database In-Memory Advisor

Oracle Database In-Memory Advisor est maintenant disponible.
Pour utiliser cet assistant, le "Database Tuning Pack" est nécessaire.

Plus d'information :
  • Page OTN
  • Note MOS 1965342.1