statistics: reduce dumpStatsMaxDuration as 5min (pingcap#56538) (ping…

…cap#56736)

ref pingcap#56537

statistics/handle/update.go

@@ -400,7 +400,7 @@ var (
 	// DumpStatsDeltaRatio is the lower bound of `Modify Count / Table Count` for stats delta to be dumped.
 	DumpStatsDeltaRatio = 1 / 10000.0
 	// dumpStatsMaxDuration is the max duration since last update.
-	dumpStatsMaxDuration = time.Hour
+	dumpStatsMaxDuration = 5 * time.Minute
 )
 
 // needDumpStatsDelta checks whether to dump stats delta.
@@ -427,7 +427,7 @@ func (h *Handle) needDumpStatsDelta(is infoschema.InfoSchema, mode dumpMode, id
 		item.InitTime = currentTime
 	}
 	if currentTime.Sub(item.InitTime) > dumpStatsMaxDuration {
-		// Dump the stats to kv at least once an hour.
+		// Dump the stats to kv at least once 5 minutes.
 		return true
 	}
 	statsTbl := h.GetPartitionStats(tbl.Meta(), id)