Re: automating database creation

Hi Nenad,
you might want to give a look at a couple of presentations that I gave in the past about DB on ACFS and clone structures.

https://www.slideshare.net/ludovicocaldara/how-to-bake-a-customer-story-with-with-windows-nvme-data-guard-acfs-snapshots-perl https://www.slideshare.net/ludovicocaldara/oracle-database-on-acfs-a-perfect-marriage

About your questions:

1. Where do you place the mount points for user data directories? The ACFS Administration Manual suggests placing it under /acfsmounts, which deviates from the recommendation in OFA.

It does not matter, mountpoints are mountpoints. Stick to your naming convention (e.g. /u02/oradata, /u02/oraredo1, /u02/oraredo2...)

2. You have a separate disk group for online redo logs, right? The best practices document suggest that, but the examples in the ACFS Administration Guide are without it.

I'd recommend at least 4 ASM disk groups (DATA, REDO1, REDO2, FRA).

Regarding the Filesystem , you can create just one big filesystem per diskgroup, so you don't have to micro-manage one per database. If you do that, the important step is to create a snapshot in DATA per database and always have your datafiles in a snapshots (yes, also for the "base databases"), never in the filesystem directly. In this way, each snapshot is self-contained and the snapshot clones will be more efficient.

This is not required (not recommended) for REDO logs. Never snapshot the REDO filesystem or you will have big performance problems.

3. In which disk group do you keep the mirrored copies of the online redo logs?

See above

4. Do you keep the Oracle Software in ACFS, too?

No, I prefer to have the software local to the machines, so I can do rolling-patching either in-place or out-of-place (although in general I do it out-of-place).

HTH

-- 
Ludo

Il giorno lun 17 ago 2020 alle ore 10:50 Noveljic Nenad <
nenad.noveljic_at_vontobel.com> ha scritto:



> Hi Ludovico,


>

>

>

> Thank you for this information.

>

>

>

> >but at every new version DBCA was introducing a new surprise

>

>

>

> The arbitrary behavior across different releases is a no-go. This

> information is invaluable, because I couldn’t have discovered it by testing

> dbca on a single release.

>

>

>

> > What I would do if I have to start again is to have a first script that

> automates the creation of new templates from scratch (CREATE DATABASE

> {{tpl_name}} ...) and a second one that clones the template: copy of

> datafiles + create controlfile + dbid + add tempfiles, nothing complex at

> all. In this way you can also integrate the database creation with the

> management of your ACFS filesystem, if you want to leverage snapshots.

>

>

>

> Interestingly, our current implementation with the create templates is

> identical to your idea, because we’ve been leveraging ZFS snapshots. The

> implementation has proven very robust and low-maintenance. We’ve been using

> it since 10 years without any significant modifications. We’ll reuse the

> same concept for ACFS.

>

>

>

> > Ansible, python or shell (if done properly) are good solutions for that.

>

>

>

> Python seems the best fit for our team. We’ll also check if Ansible would

> add value for some functionalities. Shell misses lots of features for

> complex processing (variable scoping, data structures, built-in libraries

> etc.). It would be expensive and less agile in the long run.

>

>

>

> I’d be grateful if you could share your preferences with regard to the

> following points concerning ACFS:

>

> 1.      Where do you place the mount points for user data directories?

> The ACFS Administration Manual suggests placing it under /acfsmounts, which

> deviates from the recommendation in OFA.

>

> 2.      You have a separate disk group for online redo logs, right? The

> best practices document suggest that, but the examples in the ACFS

> Administration Guide are without it.

>

> 3.      In which disk group do you keep the mirrored copies of the online

> redo logs?

>

> 4.      Do you keep the Oracle Software in ACFS, too?

>

>

>

>

>

> Best regards,

>

>

>

> Nenad

>

> https://nenadnoveljic.com/blog/about/

> <https://urldefense.com/v3/__https:/nenadnoveljic.com/blog/about/__;!!GvC3Dl69FG1X3k3XzQ!KZ-YtPjOpVdKpz3XqsB6VQJHXbGyHr_h57YFQFFviDiZM22g94_c6JpozP7S4lBodw$>

>

>

>

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