In order to avoid data corruption, do not perform any write operations when the server is still in read-only status. Running SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE sets the current session to read write mode. You can either increase the amount of provisioned storage to your server or start a new session in read-write mode and drop data to reclaim free storage. All subsequent read queries will work uninterrupted. Any subsequent write operations and transaction commits fail. When the server is set to read-only, all existing sessions are disconnected and uncommitted transactions are rolled back. Alternatively, if you have provisioned 5 GB of storage, the server is marked read-only when the free storage reaches less than 512 MB. Servers with more than 100 GB provisioned storage are marked read only when the free storage is less than 5 GB.įor example, if you have provisioned 110 GB of storage, and the actual utilization goes over 105 GB, the server is marked read-only. Servers with less than equal to 100 GB provisioned storage are marked read-only if the free storage is less than 512MB or 5% of the provisioned storage size. The relevant metrics to monitor are storage limit, storage percentage, storage used, and IO percent. You can monitor your I/O consumption in the Azure portal or by using Azure CLI commands. In the General Purpose and Memory Optimized pricing tiers, the IOPS scale with the provisioned storage size in a 3:1 ratio. The Basic tier does not provide an IOPS guarantee. The total amount of storage you provision also defines the I/O capacity available to your server. The storage is used for the database files, temporary files, transaction logs, and the PostgreSQL server logs. The storage you provision is the amount of storage capacity available to your Azure Database for PostgreSQL server. All other regions utilize Gen 5 logical CPUs that are based on Intel E5-2673 v4 (Broadwell) 2.3-GHz processors. China East 1, China North 1, US DoD Central, and US DoD East utilize Gen 4 logical CPUs that are based on Intel E5-2673 v3 (Haswell) 2.4-GHz processors. Compute generations and vCoresĬompute resources are provided as vCores, which represent the logical CPU of the underlying hardware. For more information, see the Scale resources section. You can't change the backup storage type after a server is created. You also can independently adjust the amount of storage up and the backup retention period up or down with no application downtime. Examples include servers for processing real-time data and high-performance transactional or analytical apps.Īfter you create a server, the number of vCores, hardware generation, and pricing tier (except to and from Basic) can be changed up or down within seconds. High-performance database workloads that require in-memory performance for faster transaction processing and higher concurrency. Examples include servers for hosting web and mobile apps and other enterprise applications. Most business workloads that require balanced compute and memory with scalable I/O throughput. Examples include servers used for development or testing or small-scale infrequently used applications. Workloads that require light compute and I/O performance. To choose a pricing tier, use the following table as a starting point. All resources are provisioned at the PostgreSQL server level. The pricing tiers are differentiated by the amount of compute in vCores that can be provisioned, memory per vCore, and the storage technology used to store the data. You can create an Azure Database for PostgreSQL server in one of three different pricing tiers: Basic, General Purpose, and Memory Optimized. Azure Database for PostgreSQL - Single Server
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