Arenadata QuickMarts
Arenadata QuickMarts (ADQM) is a cluster column-oriented DBMS built on ClickHouse. ADQM generates various online analytical reports based on vast amounts of information stored in flat marts. ADQM is much faster than traditional DBMS.
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This article describes the parameters that can be configured for ADQM services via ADCM.
Sharding is a database design principle that suggests locating parts of the same table on different shards. A shard is a cluster node that can consist of one or more replicas. Replicas are servers that duplicate data within a shard. SELECT and INSERT queries can be sent to any replica of a shard, there is no dedicated master.
Learn about the minimum hardware requirements for servers of an ADQM cluster.
Learn about the minimum software requirements for servers of an ADQM cluster.
Indexing is a technique to improve database performance. Indexes are special data structures that allow a database server to quickly find requested rows by values of a key column (or column set) without a full table scan.
The easiest way to work with ADQM/ClickHouse tables is to use the clickhouse-client console client, which becomes available on each cluster host after ADQM installation. This client allows you to enter queries, pass them to ClickHouse, and view the results.
This article discusses a typical ADQM cluster — three shards, each one consists of two replicas (in other words, a distributed cluster of 3 nodes with a replication factor of 2).
ADQM writes general and error text logs that can be useful for analyzing the causes of different errors. Additionally, you can enable logs of other types (for example, collect information about query execution, dependent views, threads, stack traces) that will be saved to special system tables in ADQM.
This section describes available tools to connect to ADQM.
To connect to ADQM, you can use clickhouse-client — a standard ClickHouse command-line client that allows you to run SQL queries and view their results in your terminal application. Once ADQM is installed, clickhouse-client is available on each server of the ADQM cluster.