tempdb Sizing and Contention

Why this problem matters

Uneven or frequently growing tempdb files can increase workspace pressure and latency. Contention on allocation pages can appear as PAGELATCH waits.

How to diagnose it

Review file sizes, growth settings, and space use inside tempdb together. Current waiting tasks help confirm whether contention is actually occurring on tempdb pages.

The queries read tempdb file configuration and current space distribution. Waiting tasks and growth events over time should also be evaluated when diagnosing contention.

SELECT name, type_desc,
       size * 8.0 / 1024 AS size_mb,
       growth,
       is_percent_growth,
       physical_name
FROM tempdb.sys.database_files
ORDER BY file_id;

SELECT SUM(user_object_reserved_page_count) * 8.0 / 1024 AS user_objects_mb,
       SUM(internal_object_reserved_page_count) * 8.0 / 1024 AS internal_objects_mb,
       SUM(version_store_reserved_page_count) * 8.0 / 1024 AS version_store_mb
FROM tempdb.sys.dm_db_file_space_usage;

A safe solution approach

Managing data files with equal sizes and growth configuration generally improves predictability. Plan file count and size from measured contention and space demand rather than a copied formula.

Why continuous monitoring matters

tempdb consumption can change rapidly with queries, version stores, and maintenance operations. moon can track trends with low overhead and route pressure alerts to Slack, PagerDuty, or webhooks.