| Cassandra |
ApsaraDB for Cassandra, an online distributed NoSQL database. It supports the SQL-like
Cassandra query language (CQL) and multi-active geo-redundancy to provide enterprise-grade
features such as security assurance, disaster recovery, monitoring, and backup and
restoration.
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| CQL |
The Cassandra query language. It is a SQL-like query language provided by Cassandra.
For more information, visit The Cassandra Query Language (CQL).
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| data center |
A data center is a node group that has independent power supply and network in a region.
Multiple data centers within an instance are connected through the internal network
and have little network latency. Faults are isolated between data centers.
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| partitioner |
A partitioner determines the policy of distributing data evenly among nodes. ApsaraDB
for Cassandra uses Murmur3Partitioner by default.
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| number of replicas |
The number of replicas indicates the number of data copies in a cluster. For example,
if the number of replicas is two, each row in a cluster has two replicas that are
on different nodes. You can specify the number of replicas when you create a keyspace.
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| replica policy |
A replica policy determines the node on which replicas are stored. You can specify
the replica policy when you create a keyspace. We recommend that you use NetworkTopologyStrategy
to deploy a cluster in multiple data centers.
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| keyspace |
A keyspace contains multiple tables. You can specify replica policies for keyspaces. |