moncheck - adjust queries to take less data
With selecting only the bare minimum we get much nicer performance.
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f759b2f993
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1960907547
@ -64,7 +64,7 @@ func check(thread int, db *sql.DB, waitDuration time.Duration) {
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log.Printf("[%d] could not start transaction: %s", thread, err)
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continue
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}
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rows, err := tx.Query("select check_id, check_id, cmdLine, states, next_time from active_checks where next_time < now() and enabled order by next_time for update skip locked limit 1;")
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rows, err := tx.Query("select check_id, cmdLine, states, notify from active_checks where next_time < now() and enabled order by next_time for update skip locked limit 1;")
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if err != nil {
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log.Printf("[%d] could not start query: %s", thread, err)
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tx.Rollback()
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@ -128,12 +128,16 @@ func check(thread int, db *sql.DB, waitDuration time.Duration) {
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states = append([]int64{0}, states[:statePos]...)
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}
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if _, err := tx.Exec("update active_checks set next_time = now() + interval, states = $2 where check_id = $1", id, pq.Array(&states)); err != nil {
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if _, err := tx.Exec("update active_checks set next_time = now() + intval, states = $2 where check_id = $1", id, pq.Array(&states)); err != nil {
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log.Printf("[%d] could not update row '%d': %s", thread, id, err)
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tx.Rollback()
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continue
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}
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if notify {
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if _, err := tx.Exec("insert into notifications(check_id, states, output) values ($1, $2, $3);", id, pq.Array(&states), &output); err != nil {
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if _, err := tx.Exec("insert into notifications(check_id, states, output) values ($1, $2, $3);", &id, pq.Array(&states), output.Bytes()); err != nil {
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log.Printf("[%d] could not create notification for '%d': %s", thread, id, err)
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tx.Rollback()
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continue
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}
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}
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tx.Commit()
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