*: open auto analyze and stats feedback by default (#6500)

config/config.go

@@ -264,7 +264,7 @@ var defaultConf = Config{
 		StatsLease:          "3s",
 		RunAutoAnalyze:      true,
 		StmtCountLimit:      5000,
-		FeedbackProbability: 0,
+		FeedbackProbability: 0.05,
 		QueryFeedbackLimit:  1024,
 		PseudoEstimateRatio: 0.7,
 	},

config/config.toml.example

@@ -131,7 +131,7 @@ stats-lease = "3s"
 run-auto-analyze = true
 
 # Probability to use the query feedback to update stats, 0 or 1 for always false/true.
-feedback-probability = 0.0
+feedback-probability = 0.05
 
 # The max number of query feedback that cache in memory.
 query-feedback-limit = 1024

sessionctx/variable/tidb_vars.go

@@ -167,7 +167,7 @@ const (
 	DefIndexLookupSize               = 20000
 	DefDistSQLScanConcurrency        = 15
 	DefBuildStatsConcurrency         = 4
-	DefAutoAnalyzeRatio              = 0.0
+	DefAutoAnalyzeRatio              = 0.7
 	DefChecksumTableConcurrency      = 4
 	DefSkipUTF8Check                 = false
 	DefOptAggPushDown                = false