Description Estimates the variance of a population based on a sample by using the numbers in a field column of records in a list or database that match conditions that you specify. The range of cells that makes up the list or database. A database is a list of related data in which rows of related information are records, and columns of data are fields.
Federation allows a Prometheus server to scrape selected time series from another Prometheus server. Use cases There are different use cases for federation. Commonly, it is used to either achieve scalable Prometheus monitoring setups or to pull related metrics from one service's Prometheus into another.
Hierarchical federation Hierarchical federation allows Prometheus to scale to environments with tens of data centers and millions of nodes. In this use case, the federation topology resembles a tree, with higher-level Prometheus servers collecting aggregated time series data from a larger number of subordinated servers.
For example, a setup might consist of many per-datacenter Prometheus servers that collect data in high detail instance-level drill-downand a set of global Prometheus servers which collect and store only aggregated data job-level drill-down from those local servers.
This provides an aggregate global view and detailed local views.
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Cross-service federation In cross-service federation, a Prometheus server of one service is configured to scrape selected data from another service's Prometheus server to enable alerting and queries against both datasets within a single server.
For example, a cluster scheduler running multiple services might expose resource usage information like memory and CPU usage about service instances running on the cluster.
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On the other hand, a service running on that cluster will only expose application-specific service metrics. Often, these two sets of metrics are scraped by separate Prometheus servers.
Using federation, the Prometheus server containing service-level metrics may pull in the cluster resource usage metrics about its specific service from the cluster Prometheus, so that both sets of metrics can be used within that server.
At least one match URL parameter must be specified to select the series to expose.
If multiple match parameters are provided, the union of all matched series is selected.This is especially useful for databases, as it means backups can be taken while the database is active, without requiring downtime.
Every backup type in ZCB relies upon one or more VSS Writers. Each writer is controlled by a Windows Service. initdb creates a new PostgreSQL database cluster.
A database cluster is a collection of databases that are managed by a single server instance.
A database cluster is a collection of databases that are managed by a single server instance. Цены уточняйте у наших менеджеров по тел: ; или смотрите прайс-лист! DevConf is a conference in South Africa for professional software developers focusing on the enterprise development scenarios.
In an Oracle cluster prior to version c, when a split brain problem occurs, the node with lowest node number survives.
However, starting from Oracle Database c, the node with higher weight will survive during split brain resolution. Sep 12, · SQL Server Reporting Services is a server-based reporting platform that provides comprehensive reporting functionality.