From 8d345cd09aedfa72d3018ee5ebdfd452de056e25 Mon Sep 17 00:00:00 2001
From: Haibin Xie <lambdax.tyler@gmail.com>
Date: Tue, 8 May 2018 19:18:50 +0800
Subject: [PATCH] *: open auto analyze and stats feedback by default (#6500)

---
 config/config.go                 | 2 +-
 config/config.toml.example       | 2 +-
 sessionctx/variable/tidb_vars.go | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/config/config.go b/config/config.go
index 9fcf062cf2..348eaa959e 100644
--- a/config/config.go
+++ b/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,
 	},
diff --git a/config/config.toml.example b/config/config.toml.example
index d850b30044..b67358286d 100644
--- a/config/config.toml.example
+++ b/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
diff --git a/sessionctx/variable/tidb_vars.go b/sessionctx/variable/tidb_vars.go
index 63b522f3ac..1695fdcb77 100644
--- a/sessionctx/variable/tidb_vars.go
+++ b/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