Replication slots are a database feature used to ensure that changes to a database are propagated to all replicas in a timely manner. They are especially useful in cases where the database is being updated frequently, such as when it is being used for a live web site.
Replication slots track the position of the replica’s redo log, and guarantee that all changes made to the database are replicated to the replica. This allows the replica to stay up-to-date with the primary database, even if it is running on a different server.
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Replication slots can be used to improve the performance of replication by allowing replicas to process changes in parallel. They can also be used to prevent replicas from falling too far behind the primary database, which can happen if the replica is unable to process changes as quickly as they are made.
In order to use replication slots, the primary database must have them configured. The number of replication slots available on a primary database is limited by the size of its redo log.
Typically, each replica will require its own replication slot.
When configuring replication slots, it is important to consider how they will be used. For example, if replicas are only needed for read-only applications, then it may not be necessary to configure replication slots on the primary database.
Additionally, if all replicas are running on the same server, then it may not be necessary to configure more than one replication slot per replica.
Replication slots can be created and managed using either SQL commands or the Oracle Database Cloud Control console.
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A Postgres replication slot is a named, logical connection between a replication client and server. It ensures that only one client can connect to a given replication slot at any given time, and that each client receives all of the WAL data written to that slot, in the order it was written. Replication slots were introduced in PostgreSQL 9.4.
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Prior to that, it was possible for multiple clients to connect to the same replication slot on the same server, which could lead to data loss if one of the clients disconnects unexpectedly.
Dice slots are a type of casino game that uses dice instead of traditional slot reels. They are usually played on a table with a dealer, but can also be played online. The game is similar to traditional slots in that players bet on where the dice will land.
A cluster slot is a type of computer memory or storage that is used in a clustered environment. It is a physical slot on a server motherboard that is used to connect to other servers in a cluster. Each server in a cluster has its own cluster slot.
A motor slot is a type of electrical connector that is used to connect an electric motor to a power source. The most common type of motor slot is the three-phase AC motor slot, which is used to connect an AC electric motor to a three-phase power source. Other types of motor slots include the single-phase AC motor slot and the direct current (DC) motor slot.
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The three-phase AC motor slot is the most common type of motor slot because it can be used with any type of three-phase AC electric motor.
A slot in Flink is a parallelism unit. It defines how many concurrent tasks can be executed in parallel. A task is the smallest unit of work that can be scheduled by the Flink framework.
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Razor slots are one of the most popular type of slot machines. They are so named because they have a very sharp and defined cutting edge on the front of the machine. This allows for a very precise and clean cut when the machine is used.
