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Upgrading OpenStack from Havana to Juno
via blogs.oracle

Upgrading from Havana to Juno - Under the Covers Upgrade from one OpenStack release to the next is a daunting task. Experienced OpenStack operators usually only do so reluctantly. After all, it took days (for some - weeks) to get OpenStack to stand...
Minimal downtime rolling database upgrade to 12c Release 1
via gavinsoorma

This note describes the procedure used to perform a rolling database upgrade from 11.2.0.3 to Oracle 12c Release 1 using a Data Guard physical standby database and transient logical standby database. The average time to perform a database upgrade would...
SQL SERVER – How to Roll Back SQL Server Database Changes
via sqlauthority

In a perfect scenario, no unexpected and unplanned changes occur. There are no unpleasant surprises, no inadvertent changes. However, even with all precautions and testing, there is sometimes a need to revert a structure or data change. One of the methods...
Episode 31: What Has Virtualization Done To My Database?
via alvinashcraft.newsblur

alvinashcraft shared this story from SQL Data Partners. As database administrators, we have to live with virtualization. As a consultant, I can’t think of a single environment I have been in that didn’t have some of the SQL Servers virtualized. Troubleshooting...
Read-along: Berkeley DB
via markhansen

In this post, I read along with the 1999 Berkeley DB USENIX paper. Berkeley DB as a tiny (175KB) embedded key-value filesystem-backed database. Berkeley DB lets you associate byte-string keys to byte-string values, with no practical limits on the size...