diff --git a/session/bootstrap.go b/session/bootstrap.go
index 50fae971872d3..5afcba11ae4a2 100644
--- a/session/bootstrap.go
+++ b/session/bootstrap.go
@@ -583,13 +583,11 @@ const (
 	version84 = 84
 	// version85 updates bindings with status 'using' in mysql.bind_info table to 'enabled' status
 	version85 = 85
-	// version86 changes global variable `tidb_enable_top_sql` value from false to true.
-	version86 = 86
 )
 
 // currentBootstrapVersion is defined as a variable, so we can modify its value for testing.
 // please make sure this is the largest version
-var currentBootstrapVersion int64 = version86
+var currentBootstrapVersion int64 = version85
 
 var (
 	bootstrapVersion = []func(Session, int64){
@@ -678,7 +676,6 @@ var (
 		upgradeToVer83,
 		upgradeToVer84,
 		upgradeToVer85,
-		upgradeToVer86,
 	}
 )
 
@@ -1755,14 +1752,6 @@ func upgradeToVer85(s Session, ver int64) {
 	mustExecute(s, fmt.Sprintf("UPDATE HIGH_PRIORITY mysql.bind_info SET status= '%s' WHERE status = '%s'", bindinfo.Enabled, bindinfo.Using))
 }
 
-func upgradeToVer86(s Session, ver int64) {
-	if ver >= version86 {
-		return
-	}
-	// Enable Top SQL by default after upgrade
-	mustExecute(s, "set @@global.tidb_enable_top_sql = 1")
-}
-
 func writeOOMAction(s Session) {
 	comment := "oom-action is `log` by default in v3.0.x, `cancel` by default in v4.0.11+"
 	mustExecute(s, `INSERT HIGH_PRIORITY INTO %n.%n VALUES (%?, %?, %?) ON DUPLICATE KEY UPDATE VARIABLE_VALUE= %?`,
@@ -1915,10 +1904,6 @@ func doDMLWorks(s Session) {
 			}
 			value := fmt.Sprintf(`("%s", "%s")`, strings.ToLower(k), vVal)
 			values = append(values, value)
-
-			if v.GlobalConfigName != "" {
-				domain.GetDomain(s).NotifyGlobalConfigChange(v.GlobalConfigName, variable.OnOffToTrueFalse(vVal))
-			}
 		}
 	}
 	sql := fmt.Sprintf("INSERT HIGH_PRIORITY INTO %s.%s VALUES %s;", mysql.SystemDB, mysql.GlobalVariablesTable,
diff --git a/session/bootstrap_test.go b/session/bootstrap_test.go
index 659d237a63b71..581068a9f56bd 100644
--- a/session/bootstrap_test.go
+++ b/session/bootstrap_test.go
@@ -24,7 +24,6 @@ import (
 	"github.com/pingcap/tidb/bindinfo"
 	"github.com/pingcap/tidb/config"
 	"github.com/pingcap/tidb/domain"
-	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/meta"
 	"github.com/pingcap/tidb/parser/auth"
 	"github.com/pingcap/tidb/sessionctx"
@@ -1095,55 +1094,3 @@ func TestUpgradeToVer85(t *testing.T) {
 	require.NoError(t, r.Close())
 	mustExec(t, se, "delete from mysql.bind_info where default_db = 'test'")
 }
-
-func TestUpgradeVersion86(t *testing.T) {
-	ctx := context.Background()
-	store, dom := createStoreAndBootstrap(t)
-	defer func() { require.NoError(t, store.Close()) }()
-
-	seV85 := createSessionAndSetID(t, store)
-	txn, err := store.Begin()
-	require.NoError(t, err)
-	m := meta.NewMeta(txn)
-	err = m.FinishBootstrap(int64(85))
-	require.NoError(t, err)
-	err = txn.Commit(context.Background())
-	require.NoError(t, err)
-	mustExec(t, seV85, "update mysql.tidb set variable_value='85' where variable_name='tidb_server_version'")
-	mustExec(t, seV85, "set @@global.tidb_enable_top_sql = 0")
-	mustExec(t, seV85, "commit")
-	unsetStoreBootstrapped(store.UUID())
-	ver, err := getBootstrapVersion(seV85)
-	require.NoError(t, err)
-	require.Equal(t, int64(85), ver)
-	// Top SQL is disabled in old version TiDB by default.
-	r := mustExec(t, seV85, `SELECT @@global.tidb_enable_top_sql`)
-	req := r.NewChunk(nil)
-	require.NoError(t, r.Next(ctx, req))
-	require.Equal(t, 1, req.NumRows())
-	row := req.GetRow(0)
-	require.Equal(t, int64(0), row.GetInt64(0))
-	dom.Close()
-
-	// after upgrade.
-	domV86, err := BootstrapSession(store)
-	require.NoError(t, err)
-	defer domV86.Close()
-	seV86 := createSessionAndSetID(t, store)
-	ver, err = getBootstrapVersion(seV86)
-	require.NoError(t, err)
-	require.Equal(t, currentBootstrapVersion, ver)
-	r = mustExec(t, seV86, `SELECT @@global.tidb_enable_top_sql`)
-	req = r.NewChunk(nil)
-	require.NoError(t, r.Next(ctx, req))
-	require.Equal(t, 1, req.NumRows())
-	row = req.GetRow(0)
-	require.Equal(t, int64(1), row.GetInt64(0))
-
-	storeWithePD, ok := store.(kv.StorageWithPD)
-	require.True(t, ok)
-	items, err := storeWithePD.GetPDClient().LoadGlobalConfig(ctx, []string{"enable_resource_metering"})
-	require.NoError(t, err)
-	require.Equal(t, 1, len(items))
-	require.Equal(t, "true", items[0].Value)
-}
diff --git a/util/topsql/state/state.go b/util/topsql/state/state.go
index 8c76f68059cbf..d86823e303c0f 100644
--- a/util/topsql/state/state.go
+++ b/util/topsql/state/state.go
@@ -18,7 +18,7 @@ import "go.uber.org/atomic"
 
 // Default Top-SQL state values.
 const (
-	DefTiDBTopSQLEnable                = true
+	DefTiDBTopSQLEnable                = false
 	DefTiDBTopSQLPrecisionSeconds      = 1
 	DefTiDBTopSQLMaxTimeSeriesCount    = 100
 	DefTiDBTopSQLMaxMetaCount          = 5000