Introduction SYSDATE is a SQL function that returns the current date and time set for the operating system of the database server. CURRENT_DATE returns the current date in the session time zone. The same story applies to SYSTIMESTAMP and CURRENT_TIMESTAMP. When database and application servers are set to the same time zone, both functions will return the…
Introduction To directly export and import data to and from Object Storage, you need the DBMS_CLOUD PL/SQL package, which was initially introduced in Oracle Autonomous Database. DBMS_CLOUD was made available for non-Autonomous Oracle Databases with version 21c and later backported to 19.9. However, direct import and export from and to Object Storage using the Data…
Introduction From the very first version, Oracle Zero Downtime Migration (ZDM) supports physical online, and offline migrations using RMAN and Data Guard. However, every migration job was creating a new RMAN backup from the source database to be used to create the target database. Starting with ZDM version 21.2, you can skip the full backup…
Introduction Zero Downtime Migration (ZDM) provides great automation capabilities to migrate your Oracle Database to Oracle Cloud. After supporting Linux-based platforms, the new version 21.2 also supports cross-platform and even cross-cloud migrations. With this enhancement, now it’s possible to migrate an AWS RDS for Oracle to Oracle Autonomous Database using the offline logical migration method…
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…
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…
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…
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…
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.…
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…
