Disable InnoDB Adaptive Hash Index

Superset BI workloads are dominated by range scans (SQL Lab analytics)
rather than point lookups where AHI helps. Disabling AHI frees buffer
pool memory for actual data pages. Re-enable after profiling with
SHOW ENGINE INNODB STATUS if hash searches exceed 10% of non-hash.

Closes #83

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: szachovy

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Dependabot updates for `github-actions` and `terraform` ecosystems. (#29)
 * CI workflow to build and push service images to GitHub Container Registry on master merge. (#97)
 * Pull-first with local build fallback for container images during deployment. (#97)
+* Disable InnoDB Adaptive Hash Index to free buffer pool memory for BI workload. (#83)
 
 ### Changed
 

services/mysql-server/mysql_config.cnf.tpl

@@ -14,3 +14,4 @@ ssl-key = "/etc/mysql/ssl/mysql_server_key.pem"
 require_secure_transport = "ON"
 max_connections = "50"
 max_connect_errors = "50"
+innodb_adaptive_hash_index = "OFF"