Technical

jeremy.schneider's picture

Operationally Scalable Practices

I really enjoy being a technical guy. So far in my career I’ve made development choices favoring a technical path over other options. It’s been a great ride – I’ve worked in small teams and large teams; consulting roles and in-house roles; architecture/engineering roles and operations roles; big databases and little databases; environments with a few databases and environments with thousands of databases.

I’ve never been anywhere which had everything right. Also, my own ideas about what’s “right” are still evolving today. I have a habit of trying to be around people who are smarter than me… over the course of my career, my own knowledge and experience with Oracle have grown exponentially and yet I’ve never had trouble continuing to feel like a junior DBA. (In particular, my invitation to the Oak Table made this very easy!)

jeremy.schneider's picture

Operationally Scalable Practices

I really enjoy being a technical guy. So far in my career I’ve made development choices favoring a technical path over other options. It’s been a great ride – I’ve worked in small teams and large teams; consulting roles and in-house roles; architecture/engineering roles and operations roles; big databases and little databases; environments with a few databases and environments with thousands of databases.

I’ve never been anywhere which had everything right. Also, my own ideas about what’s “right” are still evolving today. I have a habit of trying to be around people who are smarter than me… over the course of my career, my own knowledge and experience with Oracle have grown exponentially and yet I’ve never had trouble continuing to feel like a junior DBA. (In particular, my invitation to the Oak Table made this very easy!)

jeremy.schneider's picture

Voting Disk Lies (CRS-4000)

Add this to the category of annoyingly unhelpful error messages.

I’m working on a mostly-automated process to create a new cluster by cloning another existing cluster. After running OUI (Oracle Universal Installer – called by config.sh to just run config assistants) there is a single ASM diskgroup which contains both the OCR and Voting Disk; however I wanted to switch the voting disks over to some different physical devices.

Upon which I received this errors:


(root)# /oracle/11203/grid/bin/crsctl replace votedisk +CLST3_VOTING
Failed to create voting files on disk group CLST3_VOTING.
Change to configuration failed, but was successfully rolled back.
CRS-4000: Command Replace failed, or completed with errors.

Lovely… so very informative. And just to be clear, it didn’t complete with errors, it completely failed. Thanks Oracle.

jeremy.schneider's picture

Voting Disk Lies (CRS-4000)

Add this to the category of annoyingly unhelpful error messages.

I’m working on a mostly-automated process to create a new cluster by cloning another existing cluster. After running OUI (Oracle Universal Installer – called by config.sh to just run config assistants) there is a single ASM diskgroup which contains both the OCR and Voting Disk; however I wanted to switch the voting disks over to some different physical devices.

Upon which I received this errors:


(root)# /oracle/11203/grid/bin/crsctl replace votedisk +CLST3_VOTING
Failed to create voting files on disk group CLST3_VOTING.
Change to configuration failed, but was successfully rolled back.
CRS-4000: Command Replace failed, or completed with errors.

Lovely… so very informative. And just to be clear, it didn’t complete with errors, it completely failed. Thanks Oracle.

jeremy.schneider's picture

Resource Manager Limits (ORA-29376)

So this is what happens when you hit that publish button too quickly – thanks Sayed for the feedback! A few corrections follow. :)


Just a brief post to mention a limit I’ve recently bumped up against. I couldn’t find any mention of this limit in the oracle docs or even on oracle’s support knowledge base. The only mention is in the text of a particular error message – I couldn’t find any further explanation or documentation.

Goal

Create a resource manager plan to guarantee fair scheduling between a large number of applications on a heavily consolidated 11.2.0.3 database. Create a consumer group for each application, put them all into a ratio-based plan so that each application gets an equal share of CPU under load.

Error

This is the error I received:

jeremy.schneider's picture

Resource Manager Limits (ORA-29376)

So this is what happens when you hit that publish button too quickly – thanks Sayed for the feedback! A few corrections follow. :)


Just a brief post to mention a limit I’ve recently bumped up against. I couldn’t find any mention of this limit in the oracle docs or even on oracle’s support knowledge base. The only mention is in the text of a particular error message – I couldn’t find any further explanation or documentation.

Goal

Create a resource manager plan to guarantee fair scheduling between a large number of applications on a heavily consolidated 11.2.0.3 database. Create a consumer group for each application, put them all into a ratio-based plan so that each application gets an equal share of CPU under load.

Error

This is the error I received:

jeremy.schneider's picture

IOUG Collaborate 2013 Wrap-Up

By now the Denver Convention Center is probably cleaned up from IOUG Collaborate. The signs directing thousands of attendees to top-notch technical presentations have been removed, the twenty rental laptops which composed the classroom for Pythian’s RAC Attack class have been returned and the vendor exhibition floor has been completely cleared out. Flight delays notwithstanding (thanks to some midwest weather), attendees are generally home by now – even those coming from places as far away as Germany and Australia.

Now that the buzz is dying down, I’ve finally found a few minutes to post my personal highlights.

Friends Old and New

First off, my favorite part of Collaborate is the opportunity to meet so many old friends and make new acquaintances who are all using Oracle technology. It’s both fun and informative to hear about the ways others are using Oracle software.

jeremy.schneider's picture

IOUG Collaborate 2013 Wrap-Up

By now the Denver Convention Center is probably cleaned up from IOUG Collaborate. The signs directing thousands of attendees to top-notch technical presentations have been removed, the twenty rental laptops which composed the classroom for Pythian’s RAC Attack class have been returned and the vendor exhibition floor has been completely cleared out. Flight delays notwithstanding (thanks to some midwest weather), attendees are generally home by now – even those coming from places as far away as Germany and Australia.

Now that the buzz is dying down, I’ve finally found a few minutes to post my personal highlights.

Friends Old and New

First off, my favorite part of Collaborate is the opportunity to meet so many old friends and make new acquaintances who are all using Oracle technology. It’s both fun and informative to hear about the ways others are using Oracle software.

jeremy.schneider's picture

How To Troubleshoot OEM 12c Cloud Control Auto-Discovery

I was recently involved with an upgrade project to go from 11.2.0.2 to 11.2.0.3 on an Exadata V2. We hit some snags during the upgrade specifically related to OEM 12c Cloud Control. We performed an out-of-place upgrade and OEM 12.1.0.1.0 had some difficulty in dealing with this.

12c Cloud Control is supposed to run a daily check which looks for new targets on each server. When it finds something new, it places this in a queue to wait for admin approval. With a single click you can promote the newly discovered target into an OEM managed object.

jeremy.schneider's picture

How To Troubleshoot OEM 12c Cloud Control Auto-Discovery

I was recently involved with an upgrade project to go from 11.2.0.2 to 11.2.0.3 on an Exadata V2. We hit some snags during the upgrade specifically related to OEM 12c Cloud Control. We performed an out-of-place upgrade and OEM 12.1.0.1.0 had some difficulty in dealing with this.

12c Cloud Control is supposed to run a daily check which looks for new targets on each server. When it finds something new, it places this in a queue to wait for admin approval. With a single click you can promote the newly discovered target into an OEM managed object.

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