A few weeks back, we began making changes to prepare for using Oracle Golden Gate. One of the first steps required is to enable "minimal supplemental logging" at the database level. We did this during an evening maintenance window. However by the time the morning workload picked up, we started seeing a lot of sessions blocking, and the root blocker was one of the DB Writer (DBWn) processes.
Looking at the blocked sessions, a query (more...)
This week I migrated our EM12c repository database to a new server as part of it's promotion to production status. Just to make it a little more exciting, the migration also involved an in-flight upgrade from 184.108.40.206 to 220.127.116.11. Much of this post is directly inspired by Martin Bach's post on the same subject
. I ran into a few other snags that weren't mentioned so I thought it would (more...)
Last Friday I kicked off a database backup to an NFS destination, using the standard "backup as compressed backupset database" syntax. Loyal readers of this blog may recall that I'm the proud custodian of a 25 Tb database, so this backup normally takes a few days, with an expected completion on Monday morning. However it was still running on Wednesday, and reviewing the logs I saw that there was just 1 channel (of the original (more...)
I recently had to change the db_unique_name of a database to make it jive with our typical database/DataGuard naming policy of appending the datacenter location. For the sake of this post let's say it was changed from ORCL to ORCL_NYC, since this database is in our fictional New York City datacenter.
I did a quick set of tests and thought I'd share the findings to save anyone any unpleasant surprises. Here are the things to (more...)
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...)
When I sat down at my desk yesterday morning I was greeted with some disturbing email alerts notifying me that one of the NFS mounts on my standby database host was full. This was the NFS mount that held an image copy of my database that is updated daily from an incremental backup. The concept and an example can be found in the documentation
. With a 25Tb database, waiting to restore from backups is not (more...)
When adding ZFSSA targets to #EM12c
, be sure to uncheck "kiosk user" for the oracle_agent user in ZFSSA. Doc ID 1609846.1https://twitter.com/dtseiler/status/428210917155692544
We recently upgraded our EM12c 18.104.22.168 installation to 22.214.171.124. This service was configured to authenticate logins against our Active Directory server via LDAP. However, after upgrading we found that authentication stopped working, even after recreating the Active Directory Authenticator (as required). I could see the list of users from AD, but could not authenticate them in EM!
In this post I'm going to share what we did to diagnose (more...)
When I started out as an Oracle DBA on Oracle 7.3, nearly everyone would tell you to avoid doing a "shutdown abort" if at all possible since it leaves the database open to possible corruptions. In the years and versions since, that thinking has softened greatly, to the point (more...)
Yesterday I was creating a new Oracle 126.96.36.199 database from a copy of datafiles and archivelogs taken from our standby. I was sure to include archivelogs from just prior to well after the span of the datafile backup time. I had created a new controlfile, gotten everything (more...)
Bobby Curtis just posted a great post about adding a database to Oracle Restart
, aka srvctl. The post is a must-read, but I do have one thing to add. In Bobby's example, he leaves out the instance_name clause (noted by the -i parameter). This won't cause a problem for (more...)
Had an interesting little case come up today when helping a client re-write a view. This legacy application stored a date value as January 1, 1970 when they didn't have a date (basically using it as a de facto NULL). I did my best to lecture the client on why (more...)
This post is the third in a short series about Oracle 11g ADR. These posts are based on the presentations I gave at the NoCOUG Summer Conference in August 2011 and at the RMOUG Training Days in February 2012.
One of the benefits of the new ADR system is the (more...)
This post is the second in a short series about Oracle 11g ADR. These posts are based on the presentations I gave at the NoCOUG Summer Conference in August 2011 and at the RMOUG Training Days in February 2012.
Wherever the DIAGNOSTIC_DEST is (remember that the default is the $ORACLE_BASE (more...)
This post is the first in a short series about Oracle 11g ADR. These posts are based on the presentations I gave at the NoCOUG Summer Conference in August 2011 and at the RMOUG Training Days in February 2012.
The Automatic Diagnostic Repository, or "ADR", is a location on disk (more...)