Rds logical replication. As a one step, I change the parameter of database B rds.

So if something like this happens one might grant rds_superuser (again) to be sure that this one is resolved. This is enabled by setting the parameter rds. This way, the same information is logged as with replica, plus information needed to allow extracting logical change sets from the WAL. 5, 9. I'm working with AWS RDS Postgres v13 in a multi-AZ setup, using a logical replication slot for replicating to another RDS instance. Oct 11, 2021 · Next, go to the AWS RDS Console and find your instance. They make it easy to elastically scale out beyond the capacity constraints of a single DB instance for read-heavy database workloads. Doing this allows Amazon RDS to fully copy the parameter group before it is used by the new DB cluster. For instructions, see Modifying parameters in a DB parameter group. Logical replication, as the name implies, operates at a logical level, replicating specific tables, databases, or even individual rows based on defined replication rules. This was unexpected, as I thought I might need to recreate 49. An Oracle replica in mounted mode is called a mounted replica. These logical slots also enable the RDS for PostgreSQL to be used as a source for AWS Database Migration Service In both physical and logical replication, you don't have the automatic failover option that you have in Amazon RDS and Amazon Aurora. logical_replication パラメータを有効にすると、DB クラスターのパフォーマンスに影響します。 パブリッシャー: Aurora PostgreSQL バージョン 2. Adjust the value to 1 using the selector to activate the feature. logical_replication=1 to achieve wal_level=logical. Note that in PostgreSQL 12 (current at time of update) logical replication is stable and reliable, but quite limited. Then, associate this DB parameter group with the Source DB instance and its physical read replica. Based on its setup, It also copies available writer/reader DB instances and applies the same configuration to the Staging/Green cluster. This read replica DB instance is an asynchronously created physical replica of the source DB instance. 10. logical_replication に 1 を設定して、そのパラメータグループを更新します。rds. Oct 5, 2019 · On AWS RDS PostgreSQL 10. Apr 29, 2020 · Logical replication with pg_recvlogical does currently not work correctly on RDS. logical_replication 設定為 1。 Find the rds. This can be done by configuring the following settings in your postgresql. Use the binary log file name and location from the previous step. Postgres. Open the RDS console, in the navigation pane select Databases, select your Enter “rds. The logical setting also adds information necessary to support logical decoding. Apply the parameter group to the database instance. logical_replication parameter in the database parameter group to 1. Logical Replication: Fine-Grained Control. I tried to run this in the database. If you don't want to go the route of taking snapshot, encrypting it and then restoring it, the only option left is to do replication to an encrypted RDS, either using DMS or by setting up binlog replication (in case of MySQL) or WAL replication (using pglogical) in case of PostgreSQL. Save the changes. Wanted to check if there is a similar option available in pglogical. logical_replication to apply these changes. So I set up an RDS replica and set rds. To enable logical replication of a self-managed PostgreSQL source database, set the following parameters and values in the postgresql. The default values of 10 are sufficient for this tutorial. ALTER SYSTEM SET rds. logical_replication) turned on. logical_replication to 1 in the custom parameter group associated with source Aurora PostgreSQL DB cluster. By default, logical replication is turned off in AWS-managed PostgreSQL DB instances. group_replication_enabled: 1 Dec 17, 2019 · Alternatively, enable RDS Storage autoscaling to mitigate any unforeseen space issues. For any of these replication options, you can use Logical Replication extension for PostgreSQL 15, 14, 13, 12, 11, 10, 9. x pg_recvlogical client. logical_replication and track_commit_timestamp and sets the value of wal_level to logical. RDS also copies all of the DB instances in the DB cluster. 若要在 RDS for PostgreSQL 中開啟邏輯複寫，請修改自訂參數群組以將 rds. Synchronous replication: Changes made to the primary database are replicated to the secondaries immediately. Modify Database options to use the new DB parameter group: RDS > Databases > Modify. CREATE / ALTER / DROP a database object (TABLE Choose the DB instance that you want to use as the source for a read replica. The following diagram illustrates the architecture of logical replication. answered Nov 10, 2022 at 15:04. Doing so automatically turns on the parameters rds. By default, only the master user account on AWS has the rds_replication role on Amazon RDS. Accepted Answer. Aug 7, 2023 · In the following screenshot, rds. Before upgrading, be sure that you know the purpose of logical replication slots that are in use and confirm that they can be RDS for PostgreSQL uses PostgreSQL native streaming replication to create a read-only copy of a source DB instance. WAL -> Logical Decoding/output_plugin -> logical log -> sender -> receiver & apply. Nov 10, 2022 · Set rds. A method of logically replicating data changes from one node ("publisher") to another node ("subscriber"). iii. Staging/Green cluster stays in sync with Production cluster using logical replication. Logical replication in PostgreSQL is done on a per-database basis, which means there will be at minimum one publication and subscription per database. Make sure this group has rds. You must have superuser access to grant the rds_replication role Nov 18, 2022 · rds_replication role — to grant permissions to manage logical slots and to stream data using logical slots. Mar 1, 2016 · Logical replication is better for some tasks, physical replication for others. As a next step, I check from the server side the parameters with this query : SELECT name,setting FROM pg_settings WHERE name IN ('wal_level','rds. The rds_replication role In the Parameters search field, type rds to find the rds. max_replication_slots – Set this parameter to the total number of subscriptions that you plan to create. To enable logical replication for an Amazon RDS PostgreSQL database instance: Create a new parameter group with the following configuration: Set the rds. rds_start_replication_until procedure stops replication, you can promote the read replica to be the new primary DB instance by using the instructions in Promoting a read replica to be a standalone DB instance. logical_replication 連接至資料庫執行個體。如果自訂參數群組已連接至資料庫執行個體，請更新參數群組以將 rds. In the Parameters search field, locate the rds. After initiating a reboot with failover for testing, I noticed the replication continued seamlessly despite the switch in primary and standby roles. Logical replication first performs the initial load of data already present in the source tables and then continues to replicate ongoing changes. For MySQL, MariaDb, Aurora MySql Blue Green Deployments RDS uses logical binlog replication. Associate the instance with a custom DB parameter group with logical replication (rds. Jul 10, 2023 · Enable logical replication. As part of applying this parameter, also set the parameters wal_level , max_wal_senders , max_replication_slots , and max_connections . logical_replication parameter to 1 (true) in the parameter group. The default value for this parameter is 0, meaning that it's turned off by default. To configure replication between Oracle DB instances, you can create replica databases. Additionally, logical replication can send data for a single table, database, or specific columns in a table. I already changed the rds. It shows Replica in the Role column. PDF RSS. group_replication_enabled parameter. Logical replication slots are typically used for AWS Database Migration Service (AMS DMS) migration. It will only use GTID if your source database is configured with GTID. Open the RDS console, in the navigation pane select Databases, select your May 23, 2023 · The primary and standby servers must be running the same PostgreSQL major version for successful replication. Choose Edit parameters to access the property values, and then choose 1 from the selector to turn on the feature. You could set up a new set of instances Jun 2, 2023 · Terms. 6 と互換) 以降 サブスクライバー: Aurora PostgreSQL データベースバージョン 2. Set rds. This post demonstrates by promoting a read replica. Using a custom DNS server for outbound network access. Subset of SQL, used for defining and managing the structure of a database. The DB cluster volume is made up of multiple copies of the data for Jan 17, 2022 · Perform the following steps to configure the pglogical extension for Amazon RDS for PostgreSQL and Aurora PostgreSQL: Edit the parameter group associated with your instance. To turn on the logical replication in the target database, set the following parameters in the database parameter group. Apr 4, 2023 · The “logical” choice. For the remaining sections, specify your DB cluster settings. May 23, 2022 · 1. I think that that is just what you need, but it is not clear when/if it will become available. custom_dns_resolution: 1: This parameter specifies whether to allow DNS resolution from the Amazon DNS server in your VPC. To initialize the pgactive extension capability on your RDS for PostgreSQL DB instance, set the value of the rds. logical_replication on my writer instance still off. 6 と互換) 以降。Amazon RDS for PostgreSQL データベース The rds. Two-phase Commit Support for Logical Decoding. logical_replication 参数值设置为 1，则 AWS RDS 设置 wal_level、max_wal_senders、max_replication_slots 和 max_connections 参数。更改这些参数可能会增加 WAL 生成。最好的做法是仅当您使用逻辑槽时设置 rds. After the read replica is created, you can see it on the Databases page in the RDS console. Logical replication is required for replication from the blue environment to the green environment. logical_replication parameter to 1. However, you can use Patroni and etcd for automatic failover management. In Postgres, there are two ways to replicate data: streaming replication or logical replication. Dec 30, 2022 · I need to change the rds. We are considering enabling logical (streaming) replication on our existing Aurora PG 13 cluster for CDC? We want to keep our aurora read replicas as is, but I haven't found good resource that ex Aug 18, 2023 · Synchronous using RDS SQL Server, which utilises a feature called 'Always On' or 'Mirroring' where the replication to the secondary site is a logical synchronous apply under the covers. logical_replication static parameter to 1. Dec 4, 2023 · つい最近だがzero-etlがRDSのpostgresをサポートしやがったのでこの際取り組む。 経緯. After the DB snapshot is copied, standard charges apply to storage in the destination Region. You can also set up replication between an RDS for MySQL DB instance and a MariaDB or MySQL instance that is external to Amazon RDS. We discuss two replication capabilities in Amazon RDS and Amazon Aurora: multi-source replication and replication filtering. RDS copies the blue environment's topology to a staging area, along with its configured features. conf file to enable logical replication by setting the wal_level to logical, and adjust max_replication_slots and max_wal_senders to accommodate the number of replicas you need. conf configuration file: Set wal_level = logical. logical_replication to 1; you can set this parameter in just a few clicks in the Amazon RDS Management Console. We chose logical replication because it allows us to: Port over a subset of tables, so we can start with a much smaller storage footprint in the destination database (reduced storage hardware footprint can increase Nov 17, 2023 · This is a pre-requisite for Group Replication to function. Edit your postgresql. rds_start_replication procedures to start replication with your replication source. Mar 28, 2019 · To enable logical replication with Aurora PostgreSQL, set up logical replication slots on your instance and stream changes from the database through these slots. If the source is an RDS for PostgreSQL or Aurora PostgreSQL instance, you need to enable rds. logical_replication parameter to 1 by following these steps: i. If it is, we recommend that you drop the self-managed replication slots and subscriptions across all databases in the blue environment, proceed with switchover, then recreate them to resume replication. logical_replication TO 1; May 26, 2020 · It is a complete cluster- and instance-level replication. Multi-source replication is supported Mar 16, 2024 · Logical replication in AWS RDS PostgreSQL is a mechanism that allows data to be replicated from one database to another by replicating the changes made to the data. - 2ndQuadrant/pglogical Sep 22, 2016 · A new rds_replication role, assigned to the master user by default, can be used to grant permissions to manipulate and stream data through logical slots. For an overview of Amazon RDS read replicas, see Overview of Amazon RDS read replicas. Best way to ensure that this works how intended is to create a new role right away in role rds_superuser. Set the rds. e. DBA: Create the pglogical extension on the source and target databases. For more details, see Migrating PostgreSQL from on-premises or Amazon EC2 to Amazon RDS using logical replication. Using pglogical extension that provides logical streaming replication and more capabilities such as copying the initial schema of the database, support for TRUNCATE, ability to replicate DDL, etc. An Oracle replica in read-only mode is called a read replica. For information about configuring replication with an external source, see Configuring binary log file position replication with an external source instance. It is a static parameter that requires a reboot to take effect. This parameter change can increase WAL generation, so Set the rds. Applies to PostgreSQL. Configure the streams pool with the initialization parameter STREAMS_POOL_SIZE. The workaround is to use a 10. Oracle Database doesn't permit writes in a replica, but you can promote a replica to make it writable. logical_replication=1 shared_preload_libraries = 'pglogical' Reboot your Amazon RDS instance for these parameters to take effect. rds_set_external_source (Aurora MySQL version 3) and mysql. Turn on logical replication. Limitations. External replication – For RDS for PostgreSQL, makes sure that the blue environment isn't a self-managed logical source (publisher) or replica (subscriber). The process starts with taking a snapshot of the data on the Feb 29, 2024 · In this post, we show you how to use advanced replication features between MySQL-compatible databases such as Amazon Aurora MySQL-Compatible Edition clusters or Amazon Relational Database Service (Amazon RDS) for MySQL instances. Click on the Configuration tab and find the parameter group for this database. logical_replication static parameter and set its value to 1. The lagging size of the replica lagging the most in terms of WAL data received. To use the mysql. This static parameter requires the reboot of the writer instance of the Aurora PostgreSQL DB cluster to Mar 22, 2020 · I started replication like this: On source: CREATE ROLE replrds; ALTER ROLE replrds WITH NOSUPERUSER INHERIT NOCREATEROLE NOCREATEDB LOGIN REPLICATION NOBYPASSRLS CONNECT PASSWORD 'xxxxx'; GRANT ALL PRIVILEGES ON DATABASE db_name to replrds; GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO replrds; CREATE PUBLICATION rds_pub FOR ALL TABLES; Mar 15, 2024 · 1. Logical replication: Only selected tables and data changes are replicated to the secondary database. Changes are sent out in streams identified by logical replication slots. Engine log + Binlog -> byte encoded -> binlog stream -> binlog apply. Jan 24, 2024 · In the following sections, we discuss three replication options to perform an out-of-place upgrade. Turn on logical decoding. An Aurora Replica is an independent endpoint in an Aurora DB cluster, best used for scaling read operations and increasing availability. In one RDS cluster, you can create multiple databases. Apply immediately or a reboot is required to reflect the configuration change into wal_level. Set max_replication_slots to a value greater than 1. An Aurora DB cluster can include up to 15 Aurora Replicas located throughout the Availability Zones of the Aurora DB cluster's AWS Region. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 55. rds_rds_start_replication_until_gtid procedure, GTID-based replication must be enabled. The architecture has the following When backup replication is configured for a DB instance, RDS initiates a cross-Region copy of all snapshots and transaction logs as soon as they are ready on the DB instance. Open the custom DB cluster parameter group associated with your RDS for PostgreSQL Multi-AZ DB cluster. 会社でぽちぽちetlプロセス構築をおこなっている関係上、zero-etlには注目していたのだが、生憎Aurora, Redshiftのpostgresは対応されていなかったことから試したことがなかった。 Jul 25, 2021 · rds. Apply the parameter group to the database. logical_replication = 1 and restart the Postgres Service. Nov 27, 2022 · To use a Blue/Green Deployment in your Aurora MySQL DB cluster, you should turn on binary logging, changing the value for the binlog_format parameter from OFF to ROW in the DB cluster parameter group. 4 (Postgres), providing much faster replication than Slony, Bucardo or Londiste, as well as cross-version upgrades. 0 (PostgreSQL 10. Using logical replication. Use physical replication if you are asking this question. logical_replication パラメータは静的パラメータなので、有効にするには DB インスタンスの再起動が必要です。 MySQL. Jun 17, 2021 · Upgrading an Amazon RDS for Oracle DB instance with logical replication. 528 4 10. Securing connections to RDS for PostgreSQL with SSL/TLS. To create a read replica from a source DB instance, use the AWS CLI command create-db-instance-read-replica. logical_replication=1 is set. Jan 11, 2024 · To set up logical replication following the primary-standby pattern, start by configuring your primary database. Synchronous using Oracle RDS Custom, where we are able to access the underlying operating system and also make certain customisations that are not possible May 24, 2020 · While checking for roles, you don't see that you belong to rds_superuser(or not). Using a pg_dump utility. The upgrade process using logical replication involves the following high-level steps: Promote a replica to a standalone, if available, or restore a standalone DB instance from a snapshot. For Availability and durability, choose Multi-AZ DB cluster. For DB instance identifier, enter a name for the read replica. logical_replication parameter and set it to 1, to turn on logical replication. Sep 14, 2016 · In order to implement logical replication to a non-RDS database, you will need to ensure that the user account for the PostgreSQL database has the rds_superuser and rds_replication roles. Stop any DMS tasks that are dependent on the RDS instance you are upgrading by setting the rds. See PostgreSQL CREATE PUBLICATION / SUBSCRIPTION. Row_format: Replicates the change or the complete statement. Reboot the RDS for PostgreSQL DB instance so that your changes take effect. Cross-engine Events are append to the binlog (unless skipped sql_log_bin) Slaves filter using do%. Begin #. logical” in the Parameters search field to locate the parameter named rds. rds. This approach will empower database managers to evolve their systems with In the resolution provided, two source tables are replicated to two target tables using logical replication in RDS for PostgreSQL. When the upgrade is complete, upgrade the pg_statistics table by running ANALYZE on all user databases. Logical replication sends data to the replica in a logical format. Enable the logical_replication flag in that group by setting the value to 1. Set max_replication_slots and max_wal_sender to the number of concurrent Data Replication assets that you want to run. Enable logical replication by setting the rds. Depending on your expected usage, you might also need to To migrate from Amazon RDS for PostgreSQL to Aurora PostgreSQL, use one of the following methods depending on your use case: Using a snapshot. Dec 5, 2023 · Logical replication combined with Point-In-Time Recovery (PITR) in PostgreSQL offers a powerful strategy for version upgrades without significant downtime. Aug 23, 2021 · For this post, we set rds. rds_set_external_master (Aurora MySQL version 2) or mysql. logical_replication'); Feb 25, 2022 · I know it is not a relevant example but AWS DMS (which used Postgres native logical replication) gives you an option to stop/resume the replication. You can use the Parameter groups page in the Amazon RDS console or the describe-db-cluster-parameters command to verify that your DB cluster parameter group is created. logical_replication. May 25, 2022 · Set the rds. Apr 9, 2021 · Modify the following parameters at the source and reboot the instance to apply changes. In the meantime, all you can do is monitor the situation, then then drop the slot if it starts to fall behind too far. DB snapshot copy charges apply to the data transfer. When Create a parameter group for your RDS database. To migrate a database from an Amazon RDS source cluster for PostgreSQL to a Managed Service for PostgreSQL target cluster: Configure Amazon RDS. As a one step, I change the parameter of database B rds. There is a proposal to allow a logical replication slots WAL retention to be limited. Using an Aurora read replica. To turn on logical replication in RDS Complete the following prerequisites on the source database to prepare for a logical migration. The transaction on the primary is not committed until it has been successfully RDS supports both physical and logical replication. You also need to set the rds. conf: wal_level = logical shared_preload_libraries = 'pglogical'. Apply the changes. Since the 'data_directory_mode' parameter was introduced with 11. For a summary of the differences between Oracle replicas and other DB engines, see Differences among read Oct 4, 2021 · Use cases for PostgreSQL native logical replication. For example, grant rds_replication to <my_user>. For instructions, see the Amazon RDS documentation. Inspired by insights from RDS and David’s blog, we explored how this approach applies to on-premises databases. x, a 10. To enable logical replication, set the parameter rds. But it seems that RDS replica doesn't react to that - SHOW ALL says wal_level = hot_standby while it should be logical. The DB cluster is copied to the green environment, and RDS configures replication from the DB cluster in the blue environment to the DB cluster in the green environment. The rds_replication role to grant permissions to manage logical slots and to stream data using logical slots Set the rds. Overview of RDS for Oracle replicas. Create a new parameter group (non-default group). This functionality can be used for a variety of purposes, including replication solutions and auditing. 如果您将 rds. After the mysql. Amazon RDS Read Replicas provide enhanced performance and durability for Amazon RDS database (DB) instances. In the Amazon RDS DB parameter group, set the rds. When the instance is available, you can use psql (or pgAdmin) to connect to the RDS for PostgreSQL DB instance. Step #3: Create a Provider node (on the source database). Amazon Aurora PostgreSQL-compatible edition and Amazon RDS for PostgreSQL version 11 and later support logical replication using pglogical. And it will use the binlog_format that is specified for the source database. Working with PostgreSQL features supported by Amazon RDS for PostgreSQL. It's all a bit complicated. As a result, replication lag can occur. Streaming replication can be logical replication. Set wal_sender_timeout to 0. logical_replication parameter to 1 in order to get wal_level to logical. Thanks To turn on logical replication for a newly created RDS for PostgreSQL DB instance – Create a new DB custom parameter group and set the static parameter rds. on publisher: CREATE PUBLICATION mypublication FOR TABLE &lt;mytable&gt;; on subscriber: CREATE SUBSCRIPTION Jan 10, 2018 · 5. logical_replication parameter in your DB CLUSTER parameter group to 1. Connecting to a DB instance running the PostgreSQL database engine. logical_replication parameter. DDL--Data Definition Language. Offline and Online Migrations Require: The character set on the source database must be the same as the target database. 7, I turned on logical replication for a one specific table . v. These messages are either returned by the replication slot SQL interface or are sent by a walsender. iv. The rds. Using Kerberos authentication with Amazon RDS for PostgreSQL. 6, 9. logical_replication to 1. it is very important to also stop walsender to recover server memory with the following command: select pg_terminate_backend(pid) from pg_stat_replication; this will free up your server storage memory. This enables logical replication. x client will not send the command and hence work fine. Logical Replication. Jul 8, 2024 · Logical replication is available in Amazon RDS for PostgreSQL version 10. Oct 26, 2023 · Logical replication uses a publish and subscribe model with one or more subscribers subscribing to one or more publications on a publisher node. logical_replication parameter, but when i run SHOW rds. You can create one or more replicas of a given source DB Instance and serve high-volume application Jan 12, 2024 · Set rds. Set max_replication_slots and max_wal_sender to the number of concurrent Data Replication assets you want to run. wal_level = logical wal_sender_timeout = 0 max_replication_slots = 10 #number of subscriptions Mar 8, 2023 · Binary replication is a form of physical replication. Add pglogical to the shared_preload_libraries parameter. The following are typical use cases for logical replication: Data migration from on-premises or self-managed PostgreSQL environments to Aurora PostgreSQL. May 16, 2023 · I am trying to enable logical replication from B ---> C. Choose Create read replica. max_wal_senders – The number of tasks that can run in parallel. logical_replication 設定為 1，然後將 rds. Logical replication slots are used to keep track of the changes that need to be replicated. enable_pgactive parameter to 1 and then create the extension in the database. If you’re using logical replication you might consider setting up some monitoring around this metric as it could indicate that your logical replication slot on RDS has switched to inactive - meaning it is no longer consuming the Apr 27, 2024 · Logical replication allows fine-grained control over the data replication, including table-level data replication. . Note: shared_preload_libraries may have multiple comma-separated values. Option A: Logical replication with pglogical. Already tried applying the DB Cluster Parameter Group to the regional cluster and only to the writer instance. DB インスタンスにアタッチ済みのカスタムパラメータグループの場合は、rds. This means that sometimes the replica can't keep up with the primary DB instance. After the parameter settings in the parameter group are modified, you need to reboot the cluster for the changes to take effect, which causes an outage. Connect to the DB instance and call the mysql. You need to set rds. Publication for PostgreSQL Logical Replication Working with read replicas for Amazon RDS for Oracle. Using a data import from Amazon S3. g. As part of applying this parameter, set the wal_level, max_wal_senders, max_replication_slots, and max_connections parameters Aug 10, 2018 · Especially in Amazon Web Services RDS, this is a problem because RDS won't give you SUPERUSER role so you could connect and turn off the slots. For more information, see Working with parameter groups. PostgreSQL provides infrastructure to stream the modifications performed via SQL to external consumers. To enable a user account other than the master account to initiate logical replication, you must grant the account the rds_replication role. Use logical replication if data migration using Yandex Data Transfer is not possible for any reason. Mar 9, 2023 · Once installed, you'll need to configure PostgreSQL to load the extension and use logical replication. Daniel Bentes. Jul 9, 2018 · The rds_replication role grants permissions to manage logical slots and to stream data using logical slots. They are also used for replicating tables from databases to data lakes, business intelligence tools, and other targets. logical_replication parameter serves the same purpose as a standalone PostgreSQL server's wal_level parameter and other parameters that control the write-ahead log file management. Jun 20, 2024 · RDS Blue/Green Deployment feature offered by AWS creates a new Staging/Green cluster from the current Production/Blue cluster. logical_replication parameter to 0. 4, and generally obey the same message flow as physical replication. When you choose Create Blue/Green Deployment, it creates a new staging environment and runs automated tasks to prepare the database for production. We recommend that you consider the following limitations of using logical replication before starting your migration: Mar 4, 2020 · 5. logical_replication parameter to 1 in the database options group for your database instance and then reboot the instance. For Actions, choose Create read replica. logical_replication set to 1 (true) and that max_replication_slots, max_logical_replication_workers and max_worker_processes are set to values > 0. ii. By default, its value is set to 0, indicating that the feature is deactivated by default. An Oracle replica database is a physical copy of your primary database. 2. AWS DMS supports change data capture (CDC) using logical replication. logical_replication 参数。 To set up logical replication for an RDS for PostgreSQL Multi-AZ DB cluster. DNS resolution must be enabled when group replication is enabled with the rds. 4 and higher. ie yt kx aa ao eu wd su tt ta