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modules/ROOT/pages/database-administration/composite-databases/concepts.adoc

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@@ -8,15 +8,15 @@ A composite database is a special type of database.
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Composite databases are the means to access this partitioned data or graphs with a single Cypher query.
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Composite databases *do not store data* independently.
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They contain _database aliases_ that target the local or remote databases (the so-called _constituents_) that constitute a fabric setup.
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They contain _database aliases_ that target the local or remote databases (the so-called _constituents_).
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Local database aliases target databases within the same DBMS, while remote database aliases target databases from another Neo4j DBMS.
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For more information, see xref:database-administration/aliases/manage-aliases-composite-databases.adoc[].
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Composite databases are managed using Cypher administrative commands.
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For a detailed example of how to create a Composite database and add database aliases to it, see xref:database-administration/composite-databases/querying-composite-databases.adoc[Set up and query composite databases].
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Composite databases cannot guarantee compatibility between constituents from different long-term support (LTS) versions of Neo4j.
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Therefore, all constituents should belong to the same LTS version.
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Composite databases cannot guarantee compatibility between constituents from different Neo4j versions.
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Constituents from versions without breaking changes should work fine, apart from newly-added features.
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If a new feature is introduced, its availability will be limited to the intersection of features available for all constituents.
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Composite databases have the following characteristics:
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* Can be deployed in standalone and cluster deployments.
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* Managed using Cypher commands, such as `CREATE COMPOSITE DATABASE` and `CREATE ALIAS`.
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* You can shard an existing database with the help of the `neo4j-admin copy` command.
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* Use the same user credentials as the database aliases.
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* Do not support database management.
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Any database management commands, index and constraint management commands, or user and security management commands must be issued directly to the DBMSs and databases, not the Composite databases.
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See xref:database-administration/composite-databases/sharding-with-copy.adoc[Sharding data with the copy command] for details.
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* Use the existing user for local constituents or the user credentials defined by the remote aliases for remote consituents.
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* Do not support privileges, index, and constraint management commands.
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These must be defined on the constituent target database in the respective DBMS.
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* Allow only transactions with queries that read from multiple graphs, or read from multiple graphs and write to a single graph.
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* Do not support Neo4j embedded in Java applications.
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Composite databases can be used only in a typical client/server mode when users connect to a Neo4j DBMS from their client application or tool via Bolt or HTTP protocol.

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