![]() PostgreSQL is managed by PostgreSQL Global Development Group. The secondary database models like the document store, RDF store, graph DBMS, and key-value store are supported by the Oracle Database. Oracle Database is a licensed or commercial relational database management system. PostgreSQL is an open-source object-relational database system based on SQL language combined with many new features that are capable of storing and scaling complicated workloads securely and efficiently. Points of difference between PostgreSQL and Oracle Databases: Factor or Aspect Various concepts like tablespaces, indices, and schemas are very similar in both databases, but they diverge in some fields like replication of the data stored and support provided by them. PostgreSQL is an open-source object-relational database system based on SQL language combined with many new features that are capable of storing and scaling complicated workloads securely and efficiently whereas Oracle is a commercially licensed relational database management software under the management of Oracle Corporation. Important: You must set the InlineLobMaxSize when you specify the task settings for your task.While looking at PostgreSQL and Oracle database management systems, the major point that differentiates both of these two databases is that Oracle is a closed database system that means the source code is not publicly available and is held by some organization or company managing that particular software, while PostgreSQL is an open-source database. However, Inline LOB mode works only during the full load phase. Then, AWS DMS migrates LOBs that are larger than the specified size in Full LOB mode by performing a lookup from the source table. The AWS DMS task transfers the small LOBs inline, which is more efficient. ![]() First, specify a value for the InlineLobMaxSize parameter, which is available only when Full LOB mode is set to true. When using Inline LOB mode, you can migrate LOBs without truncating data or slowing your task performance, by replicating both small and large LOBs. It's a best practice to be sure that you have enough memory allocated to the replication instance to handle the task. Then, you must specify the Max LOB size parameter when using Limited LOB mode. Using Limited LOB mode improves performance, but before you run the task, you must identify the maximum LOB size of the data on the source. AWS DMS then sends warnings to the AWS DMS log file. If the size of the LOB columns exceeds the size that you specified in the task, then AWS DMS truncates the data. This allows AWS DMS to pre-allocate resources and apply the LOBs in bulk. When using Limited LOB mode, you specify the maximum size of LOB column data. ![]() It's a best practice to create the separate task on a new replication instance to migrate these tables alone. ![]() If you have LOBs that are larger than a few megabytes, then you can create a separate AWS DMS task with Full LOB mode. Then, you can use Limited LOB mode if the size of the largest LOB size isn't more than a few megabytes. To improve the performance of a task that uses Full LOB mode with multiple tables, identify the size of the largest LOB in your database. Although the migration is slower, the advantage is that data isn't truncated. Because AWS DMS doesn't know the size of the LOB data that needs to be migrated, AWS DMS migrates LOBs one at a time. When using Full LOB mode, AWS DMS migrates LOBs regardless of their size. AWS DMS offers the following options when migrating LOB data: ![]()
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