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Update cypher replanner config settings #1237

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merged 2 commits into from
Apr 4, 2025
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Update cypher replanner config settings #1237

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update config setting
JPryce-Aklundh Apr 3, 2025
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JPryce-Aklundh Apr 4, 2025
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4 changes: 2 additions & 2 deletions modules/ROOT/pages/planning-and-tuning/query-tuning.adoc
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Expand Up @@ -248,8 +248,8 @@ This setting is experimental, and using it in a production environment is discou
Cypher replanning occurs in the following circumstances:

* When the query is not in the cache.
This can either be when the server is first started or restarted, if the cache has recently been cleared, or if link:{neo4j-docs-base-uri}/operations-manual/current/configuration/configuration-settings#config_server.db.query_cache_size[server.db.query_cache_size] was exceeded.
* When the time has past the link:{neo4j-docs-base-uri}/operations-manual/current/configuration/configuration-settings#config_dbms.cypher.min_replan_interval[dbms.cypher.min_replan_interval] value, and the database statistics have changed more than the link:{neo4j-docs-base-uri}/operations-manual/current/configuration/configuration-settings#config_dbms.cypher.statistics_divergence_threshold[dbms.cypher.statistics_divergence_threshold] value.
This can either be when the server is first started or restarted, if the cache has recently been cleared, or if link:{neo4j-docs-base-uri}/operations-manual/current/configuration/configuration-settings#config_server.memory.query_cache.per_db_cache_num_entries[`server.memory.query_cache.per_db_cache_num_entries`] was exceeded.
* When the time has past the link:{neo4j-docs-base-uri}/operations-manual/current/configuration/configuration-settings#config_dbms.cypher.min_replan_interval[`dbms.cypher.min_replan_interval`] value, and the database statistics have changed more than the link:{neo4j-docs-base-uri}/operations-manual/current/configuration/configuration-settings#config_dbms.cypher.statistics_divergence_threshold[`dbms.cypher.statistics_divergence_threshold`] value.

There may be situations where xref::planning-and-tuning/execution-plans.adoc[Cypher query planning] can occur at a non-ideal time.
For example, when a query must be as fast as possible and a valid plan is already in place.
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