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Materialized views

These settings control materialized view SQL support and the background refresh job. Materialized views can use dedicated worker threads or share the server's common pool.

To cap the native memory a single refresh may allocate, see cairo.mat.view.refresh.memory.limit.bytes.

cairo.mat.view.enabled​

  • Default: true
  • Reloadable: no

Enables or disables SQL support and the refresh job for materialized views.

cairo.mat.view.max.refresh.retries​

  • Default: 10
  • Reloadable: yes

Maximum number of immediate retries within a single refresh attempt. A retry happens when the base table changes structurally during the refresh, when a refresh step produces an oversized transaction, or when a step fails with an out-of-memory error, including a breach of the refresh memory limit. Each retry shrinks the refresh interval step. Once the retries are exhausted or the step cannot shrink further, the error propagates and the deferred retries governed by cairo.mat.view.refresh.busy.retry.limit take over.

cairo.mat.view.parallel.sql.enabled​

  • Default: true
  • Reloadable: no

When disabled, SQL executed by the materialized view refresh job always runs single-threaded.

cairo.mat.view.refresh.busy.retry.limit​

  • Default: 10
  • Reloadable: no

Maximum number of deferred retries after an incremental or scheduled period refresh fails with a transient error. If all retries fail, the view is invalidated. A successful refresh resets the counter; 0 disables deferred retries.

Transient errors include a busy base table or view and out-of-memory errors, including breaches of the refresh memory limit. Full refreshes and user-requested REFRESH ... RANGE FROM ... TO ... do not use these deferred retries.

cairo.mat.view.refresh.busy.retry.timeout​

  • Default: 1000
  • Reloadable: no

Delay in milliseconds before a deferred retry for an incremental or scheduled period refresh. The retry is timer-driven and does not block a refresh worker. The deprecated cairo.mat.view.refresh.oom.retry.timeout key is accepted but has no effect; deferred out-of-memory retries use this backoff.

mat.view.refresh.worker.affinity​

  • Default: equal to the CPU core count
  • Reloadable: no

Comma-separated list of numerical CPU core indexes.

mat.view.refresh.worker.count​

  • Default: 0
  • Reloadable: no

Number of dedicated worker threads assigned to refresh materialized views. When 0, uses the shared worker pool.

mat.view.refresh.worker.haltOnError​

  • Default: false
  • Reloadable: no

Flag that indicates if the worker thread must stop when an unexpected error occurs.