apoc.lock.read.nodes
Procedure

This procedure is not considered safe to run from multiple threads. It is therefore not supported by the parallel runtime. For more information, see the Cypher Manual → Parallel runtime.

Details
Syntax	`apoc.lock.read.nodes(nodes)`
Description	Acquires a read lock on the given `NODE` values.
Input arguments	Name	Type	Description
Input arguments	`nodes`	`LIST<NODE>`	The list of nodes to acquire a read lock on.

Example

Given this dataset:

CREATE (:Person {name: 'Alice', age: 30})-[:KNOWS {since: 2019}]->(:Person {name: 'Bob', age: 25})

The following query acquires read locks on all Person nodes before reading their properties, preventing other transactions from acquiring write locks on them for the duration of this transaction:

MATCH (n:Person)
WITH collect(n) AS people
CALL apoc.lock.read.nodes(people)
UNWIND people AS n
RETURN n.name AS name, n.age AS age ORDER BY n.age

Results
name	age
"Bob"	25
"Alice"	30

Unlike a write lock, a read lock allows other concurrent transactions to also acquire read locks on the same nodes. Only write locks - such as those required for SET, DELETE, or MERGE - are blocked.

More documentation of apoc.lock.read.nodes