When performing large write operations like batch updates, imports, and deletes, it is beneficial to execute subqueries in separate inner transactions. Cypher’s CALL { ... } IN TRANSACTIONS allows this, but each batch runs sequentially on a single thread, unnecessarily slowing down data imports. With Neo4j 5.21, the new `CALL { ... } IN CONCURRENT TRANSACTIONS` construct enables each batch to run on a separate thread, which can dramatically improve data loading performance.

Robert Steward

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