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The following terminology is used throughout this document:
Table 1. Terminology
Term | Description |
Communal storage | The shared storage location containing an Eon Mode database's data. The data within the communal storage is the canonical copy of the data—Vertica does not consider data as being committed until it has been written to communal storage.
The communal data storage location is based on an object store, such as an S3 bucket in Dell ECS. |
Depot
| A cache of data maintained by the nodes in an Eon Mode database to limit reads from communal storage. Retrieving data from communal storage often has high latency and potentially limited bandwidth, especially in cloud environments. Each node in the database caches the data it reads from and writes to the communal storage. When processing a query, the nodes first check this local cache for the data they need. If the data is cached locally, the nodes use the cached version instead of retrieving the data from communal storage. |