SystemDB

In Neo4j 4.0 the concept of multi-database was introduced. There’s now a database called system which contains some internal information, e.g. configured permissions. Those can be exposed by APOC.

WARN: Do not rely on the data structures within system database. They are a non-public implementation details of Neo4j and might change within minor release updates.

Table 1. Procedures
`apoc.systemdb.graph`	returns a `nodes` and `relationships` stored in systemdb.
`apoc.systemdb.execute`	executes an DDL command on system db, yields `row` for further processing

isType example

CALL apoc.systemdb.graph() YIELD nodes, relationships RETURN *;
CALL apoc.systemdb.execute('SHOW DATABASES') YIELD row RETURN row.name as dbName;