That enables AWS DMS to pre-allocate memory and load the LOB data in bulk. AWS DMS replicates records from table to table, and from column to column, according to the replication task’s transformation rules. In the navigation pane, choose Database migration tasks. In this configuration, AWS DMS has no information about the maximum size of LOBs to expect. 5. 2023-06-09T15:21:11 [SOURCE_CAPTURE ]W: Column 'value' was removed from table definition 'public. g. csv) format by default. Nov 15, 2018 · AWS DMS is a pure data migration service—don’t mistake it for a two-way database replication service. 0 to enable CDC. Validate whether the source Oracle version is supported by AWS DMS. Monitor your migration task. To get the start point for a SQL Server migration task based on your transaction log backup settings, use the fn_dblog() or fn_dump_dblog() function in SQL Server. Choose the name of task that failed. ->CLOB — Replication handles Dec 21, 2017 · LOB settings – Due to their unknown and sometimes large size, large objects (LOBs) require more processing and resources than standard objects. c:2487) Large Objects (LOB) is a mechanism for storing binary data in a database. Upon checking the logs, we can see AWS DMS created five threads, because the SALES_HIST table has five partitions and loaded the data in parallel. AWS DMS converts CLOB data into a DynamoDB string when migrating data. Tables are out of sync during the full load phase and while cached transactions for individual tables are being applied. They are created using the SECUREFILE keyword as part of the CREATE TABLE statement. Next, we need to configure CDC to start from the SCN obtained in the previous step. Size your workload and understand if it's computer-intensive or memory-intensive. Thus, LOBs are migrated one at a time, piece by piece. When planning a database migration using Amazon Database Migration Service, consider the following: To connect your source and target databases to an Amazon DMS replication instance, you configure a network. This can slow down your task. This engine is optimized for storing billions of relationships and querying the graph with Feb 10, 2023 · AWS DMS provides full, limited and inline LOB modes to migrate LOB data. Choose Enable CloudWatch logs. I have a text column called description in one of my postgres tables. Because AWS DMS doesn't know the size of the LOB data to migrate, AWS DMS migrates LOBs one at a time. For example, our approach will vary if only 10% of records in the LOB column have 2 MB data and the remaining 90% records have Nov 20, 2021 · Data migration service (DMS) is an AWS cloud service that makes it easy to migrate relational databases, data warehouses, NoSQL databases, and other types of data stores. https://docs. Restart - When you restart a task, AWS DMS begins replication from the start, and uses the table preparation mode Dec 14, 2023 · Modify the read replica instance type and increase the size of it. The notification indicates updates to the replication instance. First, create an AWS DMS replication instance by completing the following steps: On the AWS DMS console, choose Replication instances in the navigation pane. I believe it's related to LOB setting in you DMS migration task. For more information, see LOB support for source database in an AWS DMS task. A warning will be logged to the logs if a LOB is truncated due to being larger than the specified LOB size. BatchApplyEnabled is useful if you have high workload on the source DB, and a task with high target CDC latency. I would suggest you to try Limited LOB option. An instance profile specifies network and security settings. In this post, we highlight a few key features: Amazon Simple Storage Service (Amazon S3) target data validation. amazon. In the Log Sequence Number section, you enter the SCN obtained in the previous step from the Oracle database. It is slower, but it is guaranteed that all data types will be migrated. - IMHO if you are migrating and replicating mariadb or mysql I strongly suggest to use native replication. We will host the lake on Amazon S3, and use AWS DMS to hydrate the data. Though the migration is slower, the advantage is that data isn’t truncated. 5 or lower. Resolution. 7, or 8. It uses some resources on your source database. Starting from a log sequence number helps Mar 21, 2019 · Step 1: Create Amazon Simple Notification Service topic. When you use Full LOB mode, AWS DMS migrates LOBs regardless of their size. Note: If you have large object (LOBs) columns, then use Limited LOB Mode. Next, we follow the AWS DMS SQL Server source endpoint public documentation to configure the distribution database on each SQL Server AlwaysOn replica. To create your AWS DMS migration task, complete the following steps: On the AWS DMS console, under Migrate data in the navigation pane, choose Database migration tasks. 3). aws. Task status. In limited LOB mode, AWS DMS truncates any data to 64 KB that you set to LONG RAW columns longer than 64 KB. The following source endpoints have full LOB support: Dec 14, 2023 · By default, AWS DMS logs the LOB truncation and continues. This is the size of the largest LOB you are migrating, so you must query your source database for this information. If available memory is exhausted in the May 20, 2019 · As confirmed by AWS, this was indeed a bug with the latest engine (v3. To use this data type with AWS DMS, you must enable the use of LOBs for a specific task. AWS Database Migration Service (AWS DMS) is a cloud service that makes it possible to migrate relational databases, data warehouses, NoSQL databases, and other types of data stores. The network speed between the source database and the AWS DMS replication instance is slow. Aug 17, 2023 · To work with this, take the following steps for the following AWS DMS data types:->BLOB — Set Limit LOB size to the Maximum LOB size (KB) value at task creation. Task status indicates the condition of a AWS DMS task and its associated resources. For example, Jul 19, 2022 · Parallel load for partitioned data. 4. 999999999% of durability. AWS recommends that you don’t load a large number of large collections using a single task with parallel-load. Jun 28, 2018 · Task settings for CDC. . Limited LOB mode – In limited LOB mode, you set a maximum size LOB that AWS DMS should accept. 2. Memory-optimized instances are suited for memory-intensive workloads, such as ongoing migrations and replications of high-throughput transactions. Amazon Neptune is a fast, reliable, fully managed graph database service that makes it easy to build and run applications that work with highly connected datasets. AWS DMS is a managed service that is designed to have self-healing behavior. use [DBname] EXEC sys. You can use AWS DMS to migrate your data into the AWS Cloud or between combinations of cloud and on-premises setups. com/dms/latest/userguide/CHAP_Target. It is important to validate and monitor connectivity between the source database and AWS DMS, and between AWS DMS to the target, to avoid any performance issues. AWS DMS creates a new row in the target table and populates the row with all data except the associated LOB value. But, because some source and target data types are not fully supported by AWS DMS, you might see data mismatch between the source and target. Data type TEXTis defined as LOB, so you have to be sure to check "Full LOB mode" - in full LOB mode AWS DMS migrates all LOBs from source to target regardless of size. AWS DMS offers many options to capture data changes from relational databases and store the data in columnar format ( Apache Parquet) into Amazon S3: AWS DMS to migrate data into Amazon API key: sqlserver-check-for-accelerated-data-recovery. For example, a source table has a column named ID and the corresponding target table has a pre-existing column called id. Problem/Use case Jun 11, 2018 · AWS Database Migration Service (AWS DMS) helps you migrate the actual data from source database to target database. The location of the AWS DMS replication instances also varies based on the target chosen. Nov 16, 2023 · 0. If it worked as expected please answer so I can mark as the correct answer. During the applied cached changes phase and ongoing replications phase, AWS DMS uses two stream buffers, one each for incoming and outgoing data. When your AWS DMS task is in a , you have two options to allow you to continue replication: Resume - When you resume a task, AWS DMS continues replication from the last point before the task stopped or failed. This framework enables you to load data incrementally from the point of failure. Enter a name for the task. API key: oracle-validate-supported-versions-of-source Oct 23, 2017 · If you are a first-time AWS CLI user, we recommend that you read the following documentation and get accustomed to how the CLI should be used and configured: Create an AWS Identity and Access Management (IAM) user. It also doesn’t address conflict resolutions. 4 version, DMS Replication Instance engine Version 3. To set the appropriate configuration for LOB data migration, we need to know the max size of the LOB columns and how the LOB distribution looks. AWS DMS reads new changes from the transaction logs of the source database during ongoing replication. For more information on what objects AWS DMS creates, see Troubleshooting migration tasks in AWS Database Migration Service. AWS DMS migrates LOB data in two phases, which involve more round trips during migration. To do so, use an account that has the sysadmin role assigned to it, and run the following command. AWS DMS is an engineering nightmare. For more information about data types supported in AWS DMS for LOB columns, refer to Data types for AWS Database Migration Service. Aug 5, 2020 · During a full load task, AWS DMS performs a full table scan of the source table for each table processed in parallel. Table order during the full load phase cannot be guaranteed. At times, you might want to migrate large BLOBs and CLOBs outside of AWS DMS. Create a Data Lakehouse on Amazon S3; AWS DMS has limited support for extraction of large volumes of data whereas BryteFlow Ingest replicates petabytes of data with high throughput in real-time to AWS. Aug 16, 2019 · I am trying to move data from a oracle instance to postgres RDS using DMS. As part of these tasks, you also set up a virtual private cloud (VPC) based on the Amazon VPC service to contain your resources. Set up the roles required to use AWS DMS. , dms. This assessment is only valid for a full-load and CDC migration, or a CDC-only migration. When using a MySQL database as a source, consider the following: Change data capture (CDC) isn't supported for Amazon RDS MySQL 5. You can use this service for both homogeneous or heterogeneous migrations. Then, increase CommitRate value to improve performance. From the AWS Management Console, under Services May 13, 2024 · AWS Database Migration Service (AWS DMS) is a managed migration and replication service that helps move your databases to AWS securely with minimal downtime and zero data loss. For Serverless Replications, you specify Replications instead of replication instance types or tasks to define a replication. 您可以在使用相同数据库引擎的源端点和目标端点之间进行迁移，例如从一个 MySQL 数据库迁移到另一个 MySQL 数据库。. Source: postgres Target: OpenSearch. You can see which tables have been migrated successfully and which tables are in the process of AWS Database Migration Service (AWS DMS) is a web service you can use to migrate data from your database that is on-premises, on an Amazon Relational Database Service (Amazon RDS) DB instance, or in a database on an Amazon Elastic Compute Cloud (Amazon EC2) instance to a database on an AWS service. By default, DMS deactivates BatchApplySetting. If a table that contains LOBs doesn't have a primary key, there are several actions you can take to capture LOB changes: It is also important to have the primary key of a simple type, not LOB: In FULL LOB or LIMITED LOB mode, AWS DMS doesn't support replication of Aug 22, 2023 · This is much faster than the Full LOB mode since it loads it in bulk. Data migration challenges can vary depending on the size of the data, complexity of the data i tried with full LOB or Limited LOB options, going as far as 10mb for Maximum LOB size. XA transaction support for MySQL sources. Connectivity options vary depending on where the different components are deployed. これは、AWS DMS がソースデータベースとターゲットデータベースの両方から ThreadCount * PartitionSize レコードを取得するために発生します。. During CDC, AWS DMS supports LOB data types only in tables that have a primary key. In this Then, AWS DMS converts the internal data to the target data type. ValidationEnabled=true の AWS DMS タスクを使用して移行すると、メモリ使用量が増える場合があります。. AWS DMS doesn't support replicating changes from databases with accelerated data recovery. A migration project contains data providers, an instance profile, and migration rules. Then, AWS DMS migrates the LOBs to the target. For more information about LOB support in AWS DMS, see Setting LOB support for source databases in an AWS DMS task. AWS DMS needs Apache Hudi-EMR integration to apply and merge the changes (upsert) with the target tables, which requires a lot of coding. I also made sure that the datatypes are not mismatched between columns for the same tables. Repeat the same process for the other DMS endpoint, dms-blog-onpremise-oracle-endpoint. For more information, see Migrating large binary objects (LOBs). You can monitor the progress of your task by checking the task status and by monitoring the task's control table. AWS DMS handles large binary objects (LOBs) columns differently compared to other data types. After the task is created, we can start the task and monitor it from the DMS console. Doing this can help improve full load performance. PDF RSS. 1 and AWS MSK 2. When limited LOB mode is selected, any LOBs that are larger than max LOB size are Aug 1, 2023 · Limited LOB mode – In limited LOB mode, you set a maximum LOB size for AWS DMS to accept. mytest': the column data type is LOB and the table has no primary key or unique index (metadatamanager. html Limited LOB mode – In limited LOB mode, you set a maximum LOB size for DMS to accept. The new improvements are given below: Improved Oct 18, 2019 · dms-tasks-company dms-task-2JVAOJI7TQAZSPCVDXDTYBA5YE 2019-10-18T17:59:37 [TARGET_LOAD ]I: Table 'public'. Any info would be appreciated Feb 14, 2024 · By default, according to the CDK configuration, the ora2pg task is created with "Full" LOB support. In limited LOB mode, you can gain significant performance over full LOB mode. Oracle 11g introduced Secure File LOBS that provide more efficiently storage. Following additional insights have been provided by AWS to estimate the actual memory requirements: Full LOB mode (using single row insert+update, commit rate) Memory: (# of lob columns in a table) x (Number of table in parallel, default is 8) x (lob chunk size) x Optimize DMS Instance: Verify that the DMS instance (e. You might see source latency on an AWS DMS task if: The source database has limited resources. AWS DMS provides full support for using large object data types (BLOBs, CLOBs, and NCLOBs). r5. The LONG data type isn't supported in batch-optimized apply mode (TurboStream CDC mode). For more compact storage and faster query options, you also have the option to have the data written to Apache Parquet (. aws dms は、フルサイズが回復するまで、lob チャンクサイズで指定されているとおりに lob をまとめてフェッチします。その後、aws dms は lob をターゲットに移行します。 制限付き lob モード - 最大 lob サイズを指定します。これは、移行しようとしている最大 Limitations on using a MySQL database as a source for AWS DMS. Enter a task identifier. When you initiate a failover of the current writer, AWS DMS automatically connects to the new writer instance. is there anything i need to change to get LOB populated in Kafka? I am using PostgresSQL 14. Doing this can be as simple as connecting two Amazon resources in the same virtual private cloud (VPC) as your replication instance. XMLTYPE. LOB settings. From the Overview details section, note the name of the replication instance. With AWS DMS, you can discover your source data Oct 12, 2023 · One thing that is critical is to enable FULL LOB support in the DSM task. You should identify tables with the TEXT, UNITEXT, and IMAGE data types, because AWS DMS converts these objects to LOB. In this case, any JSON data larger than 4,096 KB is truncated at the 4,096 KB limit and fails the validation test in 1. 6, 5. If the size of the LOB columns exceeds the size that you specified in the task, then AWS DMS truncates the data. For AWS DMS Serverless, the left-hand navigation panel of the AWS DMS console has a new option, Serverless replications. You can use the following dynamic SQL to generate a query for each table. This allows AWS DMS to pre-allocate resources and apply the LOBs in bulk. 使用 AWS DMS，您可以将数据从源数据存储迁移到目标数据存储。. AWS DMS transfers all objects and changes performed at the source. Per the documentation, this data type is mapped to a NCLOB. Although the migration is slower, AWS DMS doesn't truncate the data. Full LOB mode – In full LOB mode AWS DMS migrates all LOBs from source to target regardless of size. AWS DMS creates the publication automatically when you use CDC Because AWS DMS doesn't know the size of the LOB data to migrate, AWS DMS migrates LOBs one at a time. Oracle extended data type. Let’s look at an example of the LOB truncation issue. 'brokered_carriers' has Non-Optimized Full LOB Support (odbc_endpoint_imp. AWS DMS also uses an important component called a sorter, which is another memory buffer. Because AWS DMS doesn't support Full Lob Mode when you use Amazon Redshift as a target for your databases, be sure to configure LobMaxSize to an appropriate value. 1. In this section, create an SNS topic to which the Lambda function that you will create in step 5 publishes notification. 2 to improve migration performance and enhance user experience. Doing so allows AWS DMS to pre-allocate memory and load the LOB data 简短描述. Create an AWS DMS replication instance. 1. During the full load, data is migrated to the target using parallel threads and stored in subfolders mapped to the partitions of Combination full LOB mode – When you set bulk-max-size to a nonzero value, this full LOB mode uses a combination of limited LOB mode and standard full LOB mode. Consider changing the task setting to use Limited Size LOB mode upon identifying tables with such datatypes. From the navigation pane, choose Replication instances. In this document, we will describe the process of setting up an AWS data lake using source data from an Amazon RDS for MySQL database. Sep 14, 2023 · Poor performance during AWS DMS full load and change data capture (CDC), especially when migrating large objects (LOBs). Make sure that Status shows successful. This means that the LOB size limitation when you use limited LOB mode applies to JSON data. This premigration assessment checks for the presence of accelerated data recovery. その後 Prerequisites for AWS Database Migration Service. It doesn’t migrate any changes or modifications to an object like an index. If any errors or exceptions occur during change data capture (CDC) replication, then the DML transaction can fail at the target database. For more information, see Setting LOB support for source databases in an AWS DMS task. Instead, you can use limited LOB mode for migrating LONG RAW columns to an Oracle target. Set up the AWS CLI. Oct 24, 2023 · Migration tasks tell the replication instance what data needs to be copied over to the target cluster. This means that when issues occur, AWS DMS attempts to fix the issue and then resume operation without you needing to take any action. Flexible scaling – You can choose flexible scaling for your data replication workload instances. Select the DMS endpoint dms-blog-cloud-aurmysql-endpoint and choose Test Connections under Actions. xlarge) has adequate resources to handle the migration workload. The core of Neptune is a purpose-built, high-performance graph database engine. It includes such indications as if the task is being created, starting, running, or stopped. CLOB Aug 22, 2019 · In the DMS console, under Resource Management, choose Endpoints. Choose Create replication instance. Sep 8, 2020 · With Amazon S3, you can cost-effectively build and scale a data lake of any size in a secure environment where data is protected by 99. Following are two important uses of the sorter component (which has others): May 30, 2023 · In this section, you create and configure AWS DMS to replicate data into the DynamoDB reference table. Make sure that your Amazon Redshift tables have a primary key. AWS DMS allows you to configure a parallel full load of partitioned data within your migration task, when using Amazon S3 as a target and a supported database engine as a source. These services can include a database on When using Amazon S3 as a target in an AWS DMS task, both full load and change data capture (CDC) data is written to comma-separated value (. This operation requires a fair amount of memory. AWS DMS supports A good answer clearly answers the question and provides constructive feedback and encourages professional growth in the question asker. In this section, you can learn the prerequisite tasks for AWS DMS, such as setting up your source and target databases. DynamoDB. Oct 12, 2020 · When using Limited LOB mode, you specify the maximum size of LOB column data. 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. In addition, you set up an Amazon EC2 Dec 5, 2018 · AWS Database Migration Service Improves Migration Speeds by Adding Support for Parallel Full Load and New LOB Migration Mechanisms. Consider scaling up the instance if necessary to improve performance. CDC latency spikes as a result of high network latency and additional round trips for LOB lookup. Full LOB mode can be quite slow. parquet) format. In addition, you specify the maximum and minimum DMS capacity units (DCUs) that you want DMS to To view the CloudWatch metrics, complete the following steps: Open the AWS DMS console. Since OpenSearch does not not offer LOB support, my description is missing in my OpenSearch documents. Choose Create task. Feb 16, 2021 · In this configuration, AWS DMS has no information about the maximum size of LOBs to expect. AWS DMS fetches LOBs in chunks as specified by the LOB chunk size until the full size is recovered. 尽管 AWS DMS 创建目标架构对象，但它只 Jan 3, 2022 · If an AWS DMS full load task is restarted upon failure, AWS DMS reloads the entire source table. A LOB column Jul 14, 2021 · AWS DMS data type: CLOB. Sep 1, 2020 · AWS DMS treats the JSON data type in PostgreSQL as a LOB data type column. The Status field should show successful. A data provider stores database connection credentials. sp_cdc_enable_db. The object names must be unique to prevent overlapping. DMS uses a single threaded replication method to process the CDC changes. To use CDC native start point with SQL Server, create a publication on any table participating in ongoing replication. Set up required permissions for the IAM user. For Amazon RDS MySQL, you must use version 5. That is for a full load task, if a LOB size is within your bulk-max-size value, the instance migrates the LOB inline as in limited LOB mode. It can be used to migrate Those task settings are discussed later in this document. If you prefer to complete migration for large tables during a Sep 16, 2019 · AWS DMS doesn't support LOB data unless it is a CLOB. I am only doing a full load operation and I have disabled all the foreign keys on the target. On the Create database migration task page, in the Task configuration section, specify the task options. Time Travel for SQL Server and Oracle. Then, as changes occur on the source, AWS DMS finds and applies those changes to your data lake, ensuring your data is consistent. c:4708) dms-tasks-company dms-task-2JVAOJI7TQAZSPCVDXDTYBA5YE 2019-10-18T17:59:37 [TARGET_LOAD ]E: RetCode: SQL_ERROR SqlState: 23505 NativeError: 1 Message: ERROR Full LOB mode has no information about chunk size. For example, suppose that limited LOB mode is set to 4,096 KB. Use the Task Monitoring view to monitor the migration tasks. However, remember that increasing the LOB Max Size increases the task’s memory 使用受限 lob 模式时，需要指定 lob 列数据的最大大小。这样一来，aws dms 就可以预分配资源并批量应用 lob。如果 lob 列的大小超过您在任务中指定的大小，则 aws dms 会截断数据。然后，aws dms 会向 aws dms 日志文件发送警告。在受限 lob 模式下，性能会有所提高，但 Some examples of objects that AWS DMS doesn't create include secondary indexes, data defaults, and non-primary key constraints. LOBs that exceed the maximum LOB size are truncated, and a warning is issued to the log file. 3. CDC – The changes during and after the full load are cached in the memory of the AWS DMS instance, based on the configuration of CDC. To help with tuning migrations of systems that contain LOBs, AWS DMS offers the limited size LOB mode and full LOB mode. That enables DMS to pre-allocate memory and load the LOB data in bulk. 7, or for a read-only replica as a source, perform the following steps: For tables without primary keys, set up MS-CDC for the database. You can see this in item 7 in the architecture diagram. However, if the end-user forgets or overlooks the logs, this can lead to truncated data. Full LOB mode. At a high level, DMS Schema Conversion operates with the following three components: instance profiles, data providers, and migration projects. For more information on replication instance size and types, see Choosing the right AWS DMS replication instance for your migration. 这两个数据存储称为端点。. Apr 11, 2019 · Use the Limited LOB mode with a very high value, a value you know your data for a row (or a cell maybe) does not exceed in size. I tried using the mapping rule bellow, but does not seem to be doing Apr 25, 2023 · For the entire list of improvements, refer to AWS Database Migration Service 3. The number of tasks and the number of threads impact CPU consumption. AWS DMS recommends to identify the size of LOB columns and choose limited or full mode, and max LOB size in the LOB settings appropriately. During the ongoing replication phase, you might observe that AWS DMS is using more resources on the target database because of poor indexing or full table scans. Limited LOB mode - Specify the maximum LOB size. AWS Database Migration Service (DMS) has expanded its functionality from replication engine version 3. AWS DMS doesn't support replicating these datatypes using FULL LOB mode. 0 Beta release notes. Short description. The following table describes the settings. Mar 2, 2020 · If your source database has large binary objects (LOBs) and you have to migrate them over to the target database, AWS DMS offers the following options: Full LOB mode – AWS DMS migrates all the LOBs from the source to the target database regardless of their size. この設定 AWS DMS では、 は予想される LOBs の最大サイズに関する情報がありません。したがって、LOB は一度に 1 つずつ移行されます。Full LOB mode は非常に低速になることがあります。 [Limited LOB mode] (制限付き LOB モード) - 制限付き LOB モードでは、DMS の最大 On the navigation pane, choose Database migration tasks, and then choose Create task. DMS provides the task level setting BatchApplyEnabled to quickly process changes on a target using batches. Nov 29, 2022 · Currently, a table must have a primary key for AWS DMS to capture LOB changes. If you are already familiar with the open-source tool Ora2Pg, you can use this tool to bulk load your data and then use AWS DMS for change data capture Feb 28, 2023 · Let’s take a closer look into Amazon CloudWatch Logs and how AWS DMS treated this task. To migrate the remaining objects that aren't migrated by AWS DMS, use one of these methods: aws dms はまた lob 列に null レコードを挿入します。 次に、AWS DMS はターゲットテーブルの行を LOB 列データで更新します。 ターゲットが AWS DMS によって作成されていない場合は、ターゲットデータ記述言語 (DDL) で NOT NULL 属性が指定されているかどうかを確認 Because AWS DMS doesn't know the size of the LOB data to migrate, AWS DMS migrates LOBs one at a time. A detailed explanation of LOB handling by AWS DMS is out of scope for this walkthrough. The Primary benefits of using SECUREFILE lobs include: Compression — Uses Oracle advanced compression to AWS DMS takes a table-by-table approach when migrating data from source to target in the Full Load phase. The AWS DMS replication instance has limited resources. After sorting out a mountain of data issues, invalid triggers, and other unrelated errors, I was able to confirm that what appeared to be garbage data in the migrated columns, was in fact just my db client's inability to understand/render geometry columns. Also, consider using memory-optimized instances. AWS DMS updates the row in the target table with the LOB data. For versions of AWS DMS earlier than 3. Full lob support is 100% mandatory for migrating spatial data to/from Oracle. Based on this, you can determine the class and size of the replication instance: AWS DMS processes LOBs in memory. ok dj zw ig nd dg yw wp ni ag