diff --git a/conf/example.input.exec/exec.toml b/conf/input.exec/exec.toml
similarity index 73%
rename from conf/example.input.exec/exec.toml
rename to conf/input.exec/exec.toml
index 9cc243f..3acfa4d 100644
--- a/conf/example.input.exec/exec.toml
+++ b/conf/input.exec/exec.toml
@@ -1,11 +1,11 @@
 # # collect interval
 # interval = 15
 
-[[instances]]
-# commands, support glob
-commands = [
-    "/opt/categraf/scripts/*.sh"
-]
+# [[instances]]
+# # commands, support glob
+# commands = [
+#     "/opt/categraf/scripts/*.sh"
+# ]
 
 # # timeout for each command to complete
 # timeout = 5
diff --git a/conf/example.input.oracle/metric.toml b/conf/input.oracle/metric.toml
similarity index 100%
rename from conf/example.input.oracle/metric.toml
rename to conf/input.oracle/metric.toml
diff --git a/conf/example.input.oracle/oracle.toml b/conf/input.oracle/oracle.toml
similarity index 65%
rename from conf/example.input.oracle/oracle.toml
rename to conf/input.oracle/oracle.toml
index d91bf2c..59cb2ce 100644
--- a/conf/example.input.oracle/oracle.toml
+++ b/conf/input.oracle/oracle.toml
@@ -1,14 +1,14 @@
 # # collect interval
 # interval = 15
 
-[[instances]]
-address = "10.1.2.3:1521/orcl"
-username = "monitor"
-password = "123456"
-is_sys_dba = false
-is_sys_oper = false
-disable_connection_pool = false
-max_open_connections = 5
+# [[instances]]
+# address = "10.1.2.3:1521/orcl"
+# username = "monitor"
+# password = "123456"
+# is_sys_dba = false
+# is_sys_oper = false
+# disable_connection_pool = false
+# max_open_connections = 5
 # # interval = global.interval * interval_times
 # interval_times = 1
 # labels = { region="cloud" }
diff --git a/inputs/exec/exec.go b/inputs/exec/exec.go
index ceef54d..8b2bb0e 100644
--- a/inputs/exec/exec.go
+++ b/inputs/exec/exec.go
@@ -58,6 +58,10 @@ func (e *Exec) GetInterval() config.Duration {
 }
 
 func (e *Exec) Init() error {
+	if len(e.Instances) == 0 {
+		return fmt.Errorf("exec instances empty")
+	}
+
 	for i := 0; i < len(e.Instances); i++ {
 		if e.Instances[i].DataFormat == "" || e.Instances[i].DataFormat == "influx" {
 			e.Instances[i].parser = influx.NewSeriesParser()
diff --git a/inputs/oracle/oracle.go b/inputs/oracle/oracle.go
index 8853d53..ca8e247 100644
--- a/inputs/oracle/oracle.go
+++ b/inputs/oracle/oracle.go
@@ -76,6 +76,9 @@ func (o *Oracle) Init() error {
 	o.dbconnpool = make(map[string]*sqlx.DB)
 	for i := 0; i < len(o.Instances); i++ {
 		dbConf := o.Instances[i]
+		if dbConf.Address == "" {
+			return fmt.Errorf("some oracle address is blank")
+		}
 		connString := getConnectionString(dbConf)
 		db, err := sqlx.Open("godror", connString)
 		if err != nil {