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May 20, 2024
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add content on indexes #38

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add content on indexes
AlexicaWright May 16, 2024
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add extra page about indexes
AlexicaWright May 16, 2024
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38 changes: 37 additions & 1 deletion documentation/movies.workspace.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -693,7 +693,7 @@ MERGE (JamesThompson)-[:REVIEWED {summary:'Fun, but a little far fetched', ratin
MERGE (JessicaThompson)-[:REVIEWED {summary:'You had me at Jerry', rating:92}]->(JerryMaguire);
----

To see a subset of the imported data run the following statement
To see a subset of the data you just created, run the following statement

[source,cypher]
----
Expand All @@ -702,6 +702,42 @@ MATCH path = (person)-[:ACTED_IN]->(m)<-[:DIRECTED]-(d)
RETURN path;
----

In the next step you will learn about indexes and constraints.

== Indexes and constraints

To aid query performance, you can add indexes to your data.
The dataset you create in this guide is very small, but it is good practice to use indexes as they can greatly improve query performance when the datasets are larger.

Run the follwing to see the existing indexes in the database:

[source, cypher]
----
SHOW INDEXES
----

As you can see, there are already some indexes present and this is a result of the two first lines in the `MERGE` clause in the previous step:

[source,cypher]
----
CREATE CONSTRAINT movie_title IF NOT EXISTS FOR (m:Movie) REQUIRE m.title IS UNIQUE;
CREATE CONSTRAINT person_name IF NOT EXISTS FOR (p:Person) REQUIRE p.name IS UNIQUE;
----

See link:https://neo4j.com/docs/cypher-manual/current/constraints/[Cypher Manual -> Constraints^] for more information on constraints.

You can add indexes on any of your properties and if you know beforehand which ones you will use the most, it makes sense to add an index on these.
In the Movies dataset, you may be interested in both the year people were born and the year movies were released.
Run the following to add indexes on these properties:

[source,cypher]
----
CREATE INDEX person_born IF NOT EXISTS FOR (p:Person) ON (p.born);
CREATE INDEX movie_released IF NOT EXISTS FOR (m:Movie) ON (m.released)
----

See link:https://neo4j.com/docs/cypher-manual/current/indexes/[Cypher Manual -> Indexes^] to learn more about indexes.

In the next step, you will look for nodes and their properties.

== Find nodes
Expand Down