Bandwidth synonym7/14/2023 It doesn’t discuss the manual aspects of database migration, such as application dependencies. This series covers only the Oracle to PostgreSQL migration process. The planning decisions that you make regarding which databases to migrate and how help define the environments required to develop the proper solutions. Building and testing the environment for Oracle, AWS DMS, and PostgreSQL.Appropriate instance types and database versions for the source environment, migration tools, and target environment.Setup tools for each different stage of the migration process.The blog series addresses the following aspects: The blog series concludes with setting up the PostgreSQL target database environment for AWS DMS. Stage 3: Target database considerations for the PostgreSQL environment.The second blog post covers setting up the Oracle source database environment with a DMS service for both one-time migrations and also continuing change data capture (CDC) replication. Stage 2: Source database considerations for the Oracle and AWS DMS CDC environment. ![]() It also covers understanding the migration process at a high level, requiring access to the Oracle database and client hardware and operating system as appropriate. This post discusses the source server infrastructure setup. Stage 1: Migration process and infrastructure considerations.This series contains three blog posts, covering the three stages of the migration: ![]() To better understand the complexities involved, see the AWS Database Blog post Database Migration-What Do You Need to Know Before You Start? These posts don’t address the complexities and intricacies of the application components and different scenarios, because these depend a great deal on the use case. The blog posts in this series provide high-level information about the components to consider for a database migration. We start with the data migration process from Oracle to a database based either on Amazon RDS for PostgreSQL or Amazon Aurora with PostgreSQL compatibility.Īlthough each of these environments is different, they share common features. The series focuses on the source and target database infrastructure, setup, tools and configurations used for migrating the production, development, testing, and staging database environments. This blog series covers the environment and configuration setups for your source Oracle database, the AWS Database Migration (AWS DMS) service, and the target PostgreSQL database. This option is available on all major brands of scanners under slightly different names: from GE and Hitachi as "Variable Bandwidth (VB)", Siemens as "Optimized Bandwidth", Philips as "Optimized Water/Fat Shift", and Canon as "Matched Bandwidth".An Oracle to PostgreSQL migration in the AWS Cloud can be a complex multistage process with different technologies and skills involved, starting from the assessment stage to the cutover stage. Here, regular or high BWs are used for early echoes, while smaller BWs are used for later echoes where the signal is weaker. ![]() Variable bandwidth, also known as optimal bandwidth or matched bandwidth, is a practical compromise that can be performed on multi-echo studies. Finally, more time spent collecting each echo limits the minimum TR, minimum TE, and maximum number of slices available for a given pulse sequence. This may result in greater geometric distortion and greater slice-to-slice differences in size. Similarly, magnetic field inhomogeneities and artifacts from ferromagnetic objects are accentuated. Secondly, chemical shift artifacts are accentuated using a narrow BW technique because a smaller band of frequencies spans each pixel. The longer sampling window also gives more time for patient motion and flow artifacts to be generated. These may be manifest as rippling or zipper-like artifacts in the center of the image. First, longer sampling provides a longer window for unwanted spurious echoes to be detected. In spite of this SNR advantage, low bandwidth techniques with their longer sampling times should be used infrequently and with caution.
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