PDB

Amazon RDS Oracle in Multitenant

By Franck Pachot . AWS has just added the possibility to create your oracle Database as as CDB (Container Database), the “new” architecture of Oracle where an instance can manage multiple databases, adding a new level between the heavy(…)

Is it possible to switch a service between 2 pluggable databases?

Introduction In an Oracle database, services have multiple purposes: identifying group of users prior authenticating them enabling/disabling access to a database for particular groups managing preferred nodes on a RAC configuration redirecting users to the primary after a switchover/failover when(…)

Oracle ACFS: “du” vs. “df” and “acfsutil info”

By Franck Pachot . This is a demo about Oracle ACFS snapshots, and how to understand the used and free space, as displayed by “df”, when there are modifications in the base parent or the snapshot children. The important(…)

Some myths about PostgreSQL vs. Oracle

By Franck Pachot . I originally wrote this as a comment on the following post that you may find on internet: https://www.2ndquadrant.com/en/blog/oracle-to-postgresql-reasons-to-migrate/ but my comment was not published (many links in it… I(…)

What is a serverless database?

By Franck Pachot . After reading the https://cloudwars.co/oracle/oracle-deal-8×8-larry-ellison-picks-amazons-pocket-again/ paper, I am writing some thoughts about how a database can be serverless and elastic. Of course, a database needs a server to process its data. Serverless(…)

Oracle disables your multitenant option when you run on EC2

I have installed Oracle 19.6 on an EC2 for our Multitenant Workshop training. And of course, during the workshop we create a lot of PDBs. If you don't have paid for the Enterprise Edition plus the(…)

PDB Snapshot Carousel Oracle 18.3

A new feature with Oracle 18c is the PDB snapshot carousel. As indicated by its name a PDB snapshot is a copy of a PDB at a specific point in time. You have the possibility to create up to eight(…)

ATP vs ADW – the Autonomous Database lockdown profiles

By Franck Pachot . The Oracle database has always distinguished two types of workloads: transactional (OLTP) and datawarehouse (VLDB, DWH, DSS, BI, analytics). There is the same idea in the managed Oracle Cloud with two autonomous database services.

18c: No Active Data Guard required (and detected) when only CDB$ROOT and PDB$SEED are opened in read-only

By Franck Pachot . When you clone a PDB on the primary CDB, you want that the same is automatically done on the standby ones. Unfortunately, for this operation, the CDB must be opened read-only. In 12.1 even the PDB(…)

Change Data Capture from Oracle with StreamSets Data Collector

By Franck Pachot . With this trend of CQRS architectures where the transactions are streamed to a bunch of heterogenous eventually consistent polyglot-persistence microservices, logical replication and Change Data Capture becomes an important component, already at the architecture design phase.