diff --git a/inputs/mysql/binlog.go b/inputs/mysql/binlog.go
index daa9901..b569e8e 100644
--- a/inputs/mysql/binlog.go
+++ b/inputs/mysql/binlog.go
@@ -11,7 +11,7 @@ import (
 	"github.com/toolkits/pkg/container/list"
 )
 
-func (m *MySQL) gatherBinlog(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string, cache map[string]float64) {
+func (m *MySQL) gatherBinlog(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string) {
 	var logBin uint8
 	err := db.QueryRow(`SELECT @@log_bin`).Scan(&logBin)
 	if err != nil {
diff --git a/inputs/mysql/mysql.go b/inputs/mysql/mysql.go
index b62bfbd..7a7142b 100644
--- a/inputs/mysql/mysql.go
+++ b/inputs/mysql/mysql.go
@@ -238,11 +238,11 @@ func (m *MySQL) gatherOnce(slist *list.SafeList, ins *Instance) {
 	m.gatherGlobalVariables(slist, ins, db, tags, cache)
 	m.gatherEngineInnodbStatus(slist, ins, db, tags, cache)
 	m.gatherEngineInnodbStatusCompute(slist, ins, db, tags, cache)
-	m.gatherBinlog(slist, ins, db, tags, cache)
-	m.gatherProcesslistByState(slist, ins, db, tags, cache)
-	m.gatherProcesslistByUser(slist, ins, db, tags, cache)
-	m.gatherSchemaSize(slist, ins, db, tags, cache)
-	m.gatherTableSize(slist, ins, db, tags, cache, false)
-	m.gatherTableSize(slist, ins, db, tags, cache, true)
-	m.gatherSlaveStatus(slist, ins, db, tags, cache)
+	m.gatherBinlog(slist, ins, db, tags)
+	m.gatherProcesslistByState(slist, ins, db, tags)
+	m.gatherProcesslistByUser(slist, ins, db, tags)
+	m.gatherSchemaSize(slist, ins, db, tags)
+	m.gatherTableSize(slist, ins, db, tags, false)
+	m.gatherTableSize(slist, ins, db, tags, true)
+	m.gatherSlaveStatus(slist, ins, db, tags)
 }
diff --git a/inputs/mysql/processlist.go b/inputs/mysql/processlist.go
index 1b8f960..2fde3aa 100644
--- a/inputs/mysql/processlist.go
+++ b/inputs/mysql/processlist.go
@@ -90,7 +90,7 @@ var (
 	}
 )
 
-func (m *MySQL) gatherProcesslistByState(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string, cache map[string]float64) {
+func (m *MySQL) gatherProcesslistByState(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string) {
 	if !ins.GatherProcessListProcessByState {
 		return
 	}
diff --git a/inputs/mysql/processlist_by_user.go b/inputs/mysql/processlist_by_user.go
index 29e761b..bb4692c 100644
--- a/inputs/mysql/processlist_by_user.go
+++ b/inputs/mysql/processlist_by_user.go
@@ -9,7 +9,7 @@ import (
 	"github.com/toolkits/pkg/container/list"
 )
 
-func (m *MySQL) gatherProcesslistByUser(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string, cache map[string]float64) {
+func (m *MySQL) gatherProcesslistByUser(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string) {
 	if !ins.GatherProcessListProcessByUser {
 		return
 	}
diff --git a/inputs/mysql/schema_size.go b/inputs/mysql/schema_size.go
index 1c55ba8..b37468a 100644
--- a/inputs/mysql/schema_size.go
+++ b/inputs/mysql/schema_size.go
@@ -9,7 +9,7 @@ import (
 	"github.com/toolkits/pkg/container/list"
 )
 
-func (m *MySQL) gatherSchemaSize(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string, cache map[string]float64) {
+func (m *MySQL) gatherSchemaSize(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string) {
 	if !ins.GatherSchemaSize {
 		return
 	}
diff --git a/inputs/mysql/slave_status.go b/inputs/mysql/slave_status.go
index 3cbe986..0df3293 100644
--- a/inputs/mysql/slave_status.go
+++ b/inputs/mysql/slave_status.go
@@ -14,7 +14,7 @@ import (
 var slaveStatusQueries = [2]string{"SHOW ALL SLAVES STATUS", "SHOW SLAVE STATUS"}
 var slaveStatusQuerySuffixes = [3]string{" NONBLOCKING", " NOLOCK", ""}
 
-func (m *MySQL) gatherSlaveStatus(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string, cache map[string]float64) {
+func (m *MySQL) gatherSlaveStatus(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string) {
 	if !ins.GatherSlaveStatus {
 		return
 	}
@@ -89,6 +89,11 @@ func (m *MySQL) gatherSlaveStatus(slist *list.SafeList, ins *Instance, db *sql.D
 		textItems["channel_name"] = textItems["connection_name"]
 	}
 
+	// default channel name is empty
+	if textItems["channel_name"] == "" {
+		textItems["channel_name"] = "default"
+	}
+
 	for k, v := range fields {
 		slist.PushFront(inputs.NewSample("slave_status_"+k, v, tags, map[string]string{
 			"master_host":  textItems["master_host"],
diff --git a/inputs/mysql/table_size.go b/inputs/mysql/table_size.go
index ad9967e..62a8c6a 100644
--- a/inputs/mysql/table_size.go
+++ b/inputs/mysql/table_size.go
@@ -9,7 +9,7 @@ import (
 	"github.com/toolkits/pkg/container/list"
 )
 
-func (m *MySQL) gatherTableSize(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string, cache map[string]float64, isSystem bool) {
+func (m *MySQL) gatherTableSize(slist *list.SafeList, ins *Instance, db *sql.DB, globalTags map[string]string, isSystem bool) {
 	query := SQL_QUERY_TABLE_SIZE
 	if isSystem {
 		query = SQL_QUERY_SYSTEM_TABLE_SIZE