postgresql streaming replication

1. What is streaming replication in Postgres?
2. What is streaming replication?
3. Does PostgreSQL support replication?
4. How does streaming replication work?
5. How does Postgres replication works?
6. How many types of replication are there in PostgreSQL?
7. How do I stop streaming replication?
8. What is logical replication?
9. What is a PostgreSQL cluster?
10. Which is better PostgreSQL or MySQL?
11. Does PostgreSQL support sharding?
12. How does MongoDB replication work?

What is streaming replication in Postgres?

PostgreSQL streaming replication is based on transferring the WAL files from the primary to the target database. PostgreSQL streaming replication is implemented using a master-slave configuration. The master is known as the primary instance and handles the primary database and its operations.

What is streaming replication?

Streaming Replication (SR) provides the capability to continuously ship and apply the WAL XLOG records to some number of standby servers in order to keep them current. This feature was added to PostgreSQL 9.0. The discussion below is a developer oriented one that contains some out of date information.

Does PostgreSQL support replication?

The process of copying data from a PostgreSQL database server to another server is called PostgreSQL Replication. The source database server is usually called the Master server, whereas the database server receiving the copied data is called the Replica server.

How does streaming replication work?

In Streaming Replication, three kinds of processes work cooperatively. A walsender process on the primary server sends WAL data to standby server; and then, a walreceiver and a startup processes on standby server receives and replays these data. A walsender and a walreceiver communicate using a single TCP connection.

How does Postgres replication works?

Understanding replication in PostgreSQL

Streaming replication in PostgreSQL works on log shipping. Every transaction in postgres is written to a transaction log called WAL (write-ahead log) to achieve durability. A slave uses these WAL segments to continuously replicate changes from its master.

How many types of replication are there in PostgreSQL?

PostgreSQL comes with three different replication methods. As with so many things, each replication method has its pros and cons.

How do I stop streaming replication?

1. There is nothing you need to do. Just shut down the slave. ...
2. If I shut down the slave doesn't the master accumulate WALs? ...
3. from the docs: Specifies the minimum number of past log file segments kept in the pg_xlog directory .

What is logical replication?

Logical replication is a method of replicating data objects and their changes, based upon their replication identity (usually a primary key). We use the term logical in contrast to physical replication, which uses exact block addresses and byte-by-byte replication.

What is a PostgreSQL cluster?

A PostgreSQL database "cluster" is a postmaster and a group of subsiduary processes, all managing a shared data directory that contains one or more databases. ... A cluster is normally created for you when you install PostgreSQL; the installation will usually initdb a new cluster for you.

Which is better PostgreSQL or MySQL?

In general, PostgreSQL is best suited for systems that require execution of complex queries, or data warehousing and data analysis. MySQL is the first choice for those web-based projects which require a database merely for data transactions and not anything intricate.

Does PostgreSQL support sharding?

In fact, PostgreSQL has implemented sharding on top of partitioning by allowing any given partition of a partitioned table to be hosted by a remote server. The basis for this is in PostgreSQL's Foreign Data Wrapper (FDW) support, which has been a part of the core of PostgreSQL for a long time.

How does MongoDB replication work?

Replication in MongoDB

Of the data bearing nodes, one and only one member is deemed the primary node, while the other nodes are deemed secondary nodes. ... The secondaries replicate the primary's oplog and apply the operations to their data sets such that the secondaries' data sets reflect the primary's data set.