How to Clone a PDB from a Standby Database in a Data Guard Environment
Introduction Cloning PDBs in Multitenant environments is an easy way to migrate a PDB from one CDB to another or to create multiple copies of that PDB for test and development purposes. The data files are being read from the source and transferred to the target CDB. Hence, cloning a PDB also means generating workload…
Part 5/5: Zero Downtime Migration (ZDM) – Physical Offline Migration using RMAN
Introduction ZDM uses RMAN to perform an offline physical migration. It backs up the source database and instantiates a new database from this backup to the target environment. This is similar to cloning a database. The target database has no relationship to the source, so there is no data synchronization or fallback capability. No SQL*Net…
Part 4/5: Zero Downtime Migration (ZDM) – Physical Online Migration using Data Guard
Introduction ZDM uses Oracle Data Guard to perform an online physical migration. This means: it backs up the source database, instantiates a standby database from this backup to the target environment, configures Data Guard to synchronize the source and target databases, and finally switches over to the target database. ZDM allows you to pause the…
Blockchain Table in Oracle Database 19.10 and 19.11 – How and what to Consider!
Introduction Oracle Blockchain Table was initially introduced in release version 20c (preview only) and later in 21c, but the feature has been backported and is now available in version 19c as well. Blockchain tables are insert-only tables that provide a highly tamper-resistant persistence option. The rows are chained by storing the previous row’s hash in…
Part 3/5: Zero Downtime Migration (ZDM) – Logical Offline Migration using Data Pump
Introduction ZDM version 21c supports logical migrations using Oracle GoldenGate as described in Part 2 or using the classical Data Pump export and import. This blog post provides a step by step instruction how to accordingly configure ZDM for Data Pump export and import with the minimal parameters required. Using Data Pump export and import…
Part 2/5: Zero Downtime Migration (ZDM) – Logical Online Migration using Oracle GoldenGate
Introduction ZDM version 21c supports logical migrations using Oracle GoldenGate. This makes it possible to migrate to Oracle Autonomous Database with zero downtime. This blog post provides a step by step instruction how to accordingly configure ZDM with the minimal parameters required. Data Pump will be used to create the initial load and GoldenGate extract…
Part 1/5: Zero Downtime Migration (ZDM) – Introduction & Installation
Introduction Oracle Zero Downtime Migration (ZDM) is a free to use software solution that allows you to automate your Oracle database migrations from on-premises to Oracle Cloud. Initially, ZDM supported Data Guard based migrations following the principles of Oracle Maximum Availability Architecture (MAA). To support Standard Edition migrations, ZDM uses RMAN backup and restore instead.…
Connect SQL Developer to Oracle Cloud Databases in Private Subnets
Introduction There is no doubt that database servers should always be provisioned in a private subnet. However, in some cases, e.g. test and development, you’d like to connect to your databases over the internet using SQL Developer installed on your local (Windows) computer. The Environment My environment for this blog post consists of the following:…
Migrating from non-encrypted, non-CDB on local file system to encrypted PDB on ASM
Introduction Oracle Databases on Oracle Cloud are created using the Multitenant architecture. All databases are encrypted using Transparent Data Encryption (TDE) by default. All databases on Exadata, Bare Metal machines, and RAC on Virtual Machines use ASM storage management. For Single Instance databases on Virtual Machine DB systems you have the choice between Logical Volume…
Save Storage Cost with Hybrid Partitioned Tables in Oracle Autonomous Database
Introduction Partitioned Tables allow you to subdivide tables into smaller pieces (partitions) that can be managed and accessed at a finer level of granularity. The nice thing is that it is entirely transparent to your SQL SELECT statements and to the application. External (Partitioned) Tables enable you to access data on external storage as if…
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