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Add covering indexes for status/dashboard queries (migration 13)

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Adds composite covering indexes on (cluster, job_state, <group_col>, ...)
for user, project, and subcluster groupings to enable index-only scans
for status views. Drops subsumed 3-column indexes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Entire-Checkpoint: 3d8def28e96e
This commit is contained in:
Jan Eitzinger
2026-03-13 13:12:54 +01:00
parent 39ab12784c
commit dd3e5427f4
3 changed files with 32 additions and 1 deletions
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18
internal/repository/migrations/sqlite3/13_status-covering-indexes.up.sql Normal file
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-- Migration 13: Add covering indexes for status/dashboard queries
-- Column order: cluster (equality), job_state (equality), grouping col, then aggregated columns
-- These indexes allow the status views to be served entirely from index scans.
CREATE INDEX IF NOT EXISTS jobs_cluster_jobstate_user_stats
ON job (cluster, job_state, hpc_user, duration, start_time, num_nodes, num_hwthreads, num_acc);
CREATE INDEX IF NOT EXISTS jobs_cluster_jobstate_project_stats
ON job (cluster, job_state, project, duration, start_time, num_nodes, num_hwthreads, num_acc);
CREATE INDEX IF NOT EXISTS jobs_cluster_jobstate_subcluster_stats
ON job (cluster, job_state, subcluster, duration, start_time, num_nodes, num_hwthreads, num_acc);
-- Drop 3-col indexes that are now subsumed by the covering indexes above
DROP INDEX IF EXISTS jobs_cluster_jobstate_user;
DROP INDEX IF EXISTS jobs_cluster_jobstate_project;
PRAGMA optimize;