Simple Query to Check if Your EM12c Plugins Are Uptodate

It’s recommended to use latest plugins with EM12c (to minimize bugs, better support for new releases of target etc), and you probably set notifications to get mails about plugin updates, but sometimes you just ignore them because you don’t have time. So you may want to check if any plugins you use have updates. It’s possible to do it using EM12c web interface. All you need is to go to “self update” page, click on (more...)

Using APEX to Create a Mobile User Interface for Enterprise Manager 12c

On November 11th, I will be presenting at Oracle Day Istanbul. My presentation will be about creating a mobile interface (a simple application) using Application Express to access Oracle Enterprise Manager repository views (and some procedures) to manage incidents and problems. I know that there’s already an application for idevices, but my application is a web application designed for mobile (thanks to APEX), so it’s compatible with all devices. The sessions are short, only 30 (more...)

How to Find Blocking Sessions in Enterprise Manager Cloud Control 12c

My friend Franck Pachot noticed that EM12c doesn’t show the blocking sessions across all RAC nodes. Let’s check if we can find them using EM12c. I have connected to first node of our RAC database, created a sample table, inserted a row, committed, and then deleted the row. While the session is open, I opened another terminal, connected to second node and tried to delete the rows in same table so my second session started (more...)

PostgreSQL Conference Europe 2014

I attended to PostgreSQL Conference Europe 2014. It was held October 21-24 at Madrid. I do not know the exact number of attendees but there were some sessions that you can not find seat and have to listen while standing up on a corner. As an Oracle DBA, PostgreSQL is a different world to me. I tried to follow the DBA track and gather as much information as I can. Unfortunately the level of DBA (more...)

Using EMCLI to Create Named Credentials

One of my blog readers asked me to write a sample EMCLI codes to create named credentials for Database. To be able to create a named credential, you need to know the target name (unless you create a global credential), target type and credential type associated with the target type. Let’s say I want to create a named credential for my database named “TESTDB”. First I need to login to our EM12c server, and list (more...)

BBED Block Browser EDitor for Oracle 11g

BBED (Block Browser Editor) is a tool for Oracle internal use, and it helps you to read and manipulate data at the Oracle Database block level. No need to say that it’s very powerful and also extremely dangerous because you can corrupt data/header blocks. There’s an unofficial but very comprehensive manual for BBED. It’s written by Graham Thornton. You can download it as PDF: http://orafaq.com/papers/dissassembling_the_data_block.pdf

Before Oracle 11g, BBED object code is shipped (more...)

Oracle TKPROF Hidden/Undocumented Parameters

While I was examining with tkprof, I noticed that there are 3 undocumented parameters (Oracle 11gR2): verbose, diag and record. Specially “record” parameter seems very useful. Let’s take a look at them.

Verbose: If you set verbose=y, tkprof will provide some extra information on output files. It adds “SQL Text addres(s)” and “SQL Text Hash Value” lines for each query:

SQL ID: 3g7sxtj9d6zd3 Plan Hash: 742841275

select privilege#,nvl(col#,0),max(mod(nvl(option$,0),2))
from
 objauth$ where obj#=:1 and grantee#=:2 group  (more...)

Configuring Oracle SQL Developer for PostgreSQL

I see that some people wonder if Oracle SQL Developer can be used with PostgreSQL. I wrote a blog post to show how you can configure Oracle SQL Developer to connect Microsoft SQL Server and MySQL. You can use the same method to configure SQL Developer for PostgreSQL. First we need to download a compatible JDBC driver from PostgreSQL site. Latest version of SQL Developer uses JDK 1.7, so we can download the JDBC41 (more...)

When is a Table Populated into the In-Memory Column Store?

I was playing with in-memory feature of Oracle 12c, and wondered when a table is loaded/populated into in-memory buffer (of course I’m talking about a table which is enabled for in-memory). In “the Oracle Database In-Memory blog”, it says Oracle typically populates the table after it has been accessed for the first time. It’s possible to check V$IM_SEGMENTS to see the memory segments of in-memory tables, so we can easily see when the table is (more...)

Enterprise Manager 12c: Failed Jobs

After I added some database targets to my Enterprise Manager 12c, an incident opened for failed jobs on a newly added database. We have some jobs scheduled to run every 5 minutes on that database, and of course we have some error-handling and alerting mechanism which will notify us if any of them fails, so there shouldn’t be any failed job. I checked run logs of all the scheduler jobs to see if there are (more...)