RDS also provides a CloudWatch metric called If this metric is equal to -1, that means replication is not enabled on the instance. For more information, see the PostgreSQL documentation for The Statistics Collector.. 1 Monitoring these metrics can help you ensure that the database is able to scale sufficiently to be able to fulfill a high rate of queries. The following steps show how to optimize DR strategy, read workload, and healthy source instance while minimizing replication lag.As an overall best practice, make sure that the read queries you run on Read Replicas use the latest version of the data as the source instance. Before we get into these metrics, let’s explore one of the key maintenance tasks that helps PostgreSQL maintain concurrent operations: the VACUUM process.MVCC enables operations to occur concurrently by utilizing snapshots of the database (hence the “multi-version” aspect of MVCC), but the tradeoff is that it creates dead rows that eventually need to be cleaned up by running a VACUUM process.The VACUUM process removes dead rows from tables and indexes and adds a marker to indicate that the space is available.
To adjust this value, return to the source instance write activity.Before launching a new replica instance, modify the value of wal_keep_segments. As you scale your Amazon RDS PostgreSQL deployment over time, keeping an eye on these metrics will help you detect and troubleshoot potential issues and keep database operations running smoothly and efficiently. In order to do so, it accounts for a number of factors, including whether or not the data in question has been indexed, as well as When a query involves updating or deleting data, PostgreSQL uses In order to speed up queries, PostgreSQL uses a certain portion of the database server’s memory as a PostgreSQL maintains data reliability by logging each transaction in the WAL on the primary server, and writing it to disk periodically. Anybody can answer To ensure that your database instances have enough network bandwidth to execute cross-region replication smoothly, AWS recommends monitoring two CloudWatch metrics:If you see both of these metrics consistently increasing, you may want to upgrade your primary/source instance, along with each cross-region read replica, to an instance class that offers higher network performance. We’ll explain how to query and track replication delay from PostgreSQL and CloudWatch in the To execute cross-region replication, RDS will create a physical replication slot on the source/primary instance for each cross-region read replica instance, and use each slot to store WAL updates that still need to be applied on each specific read replica. If the block is not cached, it will need to access the data from disk. In order to ensure high availability, the primary server needs to communicate WAL updates to one or more standby servers so that it will be prepared to failover to a standby if needed. This parameter shows the size of transaction logs generated per second. In the next index scan, PostgreSQL will see a pointer in the old row that directs it to look at the new data instead.
If you see a significantly higher number of updates than HOT updates, it may be due to frequent data updates in indexed columns. I came across remote storage adapters for InfluxDB, Graphite and OpenstDB here but they don't have an adapter for … View key operational metrics in AWS Management Console, including compute/memory/storage capacity utilization, I/O activity, and instance connections. The following diagrams describe how high write activity at the source affects replication lag:The metrics TransactionLogsDiskUsage, TransactionLogsGeneration, WriteIOPS, WriteThroughput, and WriteLatency show that the source instance was under heavy write pressure at around 16:20 and 17:00. By using our site, you acknowledge that you have read and understand our Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Learn more about hiring developers or posting ads with us