diff --git a/cmd/kingshard/main.go b/cmd/kingshard/main.go
index aac70e15..308d3f4e 100644
--- a/cmd/kingshard/main.go
+++ b/cmd/kingshard/main.go
@@ -66,12 +66,14 @@ func main() {
 	}
 	if len(*configFile) == 0 {
 		fmt.Println("must use a config file")
+		os.Exit(1)
 		return
 	}
 
 	cfg, err := config.ParseConfigFile(*configFile)
 	if err != nil {
 		fmt.Printf("parse config file error:%v\n", err.Error())
+		os.Exit(1)
 		return
 	}
 
@@ -81,6 +83,7 @@ func main() {
 		sysFile, err := golog.NewRotatingFileHandler(sysFilePath, MaxLogSize, 1)
 		if err != nil {
 			fmt.Printf("new log file error:%v\n", err.Error())
+			os.Exit(1)
 			return
 		}
 		golog.GlobalSysLogger = golog.New(sysFile, golog.Lfile|golog.Ltime|golog.Llevel)
@@ -89,6 +92,7 @@ func main() {
 		sqlFile, err := golog.NewRotatingFileHandler(sqlFilePath, MaxLogSize, 1)
 		if err != nil {
 			fmt.Printf("new log file error:%v\n", err.Error())
+			os.Exit(1)
 			return
 		}
 		golog.GlobalSqlLogger = golog.New(sqlFile, golog.Lfile|golog.Ltime|golog.Llevel)
@@ -108,6 +112,7 @@ func main() {
 		golog.Error("main", "main", err.Error(), 0)
 		golog.GlobalSysLogger.Close()
 		golog.GlobalSqlLogger.Close()
+		os.Exit(1)
 		return
 	}
 	apiSvr, err = web.NewApiServer(cfg, svr)
@@ -116,6 +121,7 @@ func main() {
 		golog.GlobalSysLogger.Close()
 		golog.GlobalSqlLogger.Close()
 		svr.Close()
+		os.Exit(1)
 		return
 	}
 	prometheusSvr, err = monitor.NewPrometheus(cfg.PrometheusAddr, svr)
@@ -124,6 +130,7 @@ func main() {
 		golog.GlobalSysLogger.Close()
 		golog.GlobalSqlLogger.Close()
 		svr.Close()
+		os.Exit(1)
 		return
 	}
 
diff --git a/etc/ks.yaml b/etc/ks.yaml
index 727af5d5..ffd1bf77 100755
--- a/etc/ks.yaml
+++ b/etc/ks.yaml
@@ -28,7 +28,7 @@ log_level : debug
 
 # if set log_sql(on|off) off,the sql log will not output
 log_sql: on
- 
+
 # only log the query that take more than slow_log_time ms
 #slow_log_time : 100
 
@@ -46,38 +46,38 @@ log_sql: on
 
 # node is an agenda for real remote mysql server.
 nodes :
-- 
-    name : node1 
+-
+    name : node1
 
     # default max conns for mysql server
     max_conns_limit : 32
 
     # all mysql in a node must have the same user and password
-    user :  root 
+    user :  root
     password : root
 
-    # master represents a real mysql master server 
+    # master represents a real mysql master server
     master : 127.0.0.1:3306
 
-    # slave represents a real mysql salve server,and the number after '@' is 
+    # slave represents a real mysql salve server,and the number after '@' is
     # read load weight of this slave.
     #slave : 192.168.59.101:3307@2,192.168.59.101:3307@3
     down_after_noalive : 32
-- 
-    name : node2 
+-
+    name : node2
 
     # default max conns for mysql server
     max_conns_limit : 32
 
     # all mysql in a node must have the same user and password
-    user :  root 
+    user :  root
     password : root
 
-    # master represents a real mysql master server 
+    # master represents a real mysql master server
     master : 127.0.0.1:3309
 
-    # slave represents a real mysql salve server 
-    slave : 
+    # slave represents a real mysql salve server
+    slave :
 
     # down mysql after N seconds noalive
     # 0 will no down
@@ -91,28 +91,28 @@ schema_list :
     default: node1
     shard:
     -
-
+        db : node2_db
+        nodes: [node2]
 -
     user: kingshard
     nodes: [node1,node2]
-    default: node1      
+    default: node1
     shard:
-    -   
+    -
         db : kingshard
         table: test_shard_hash
         key: id
         nodes: [node1, node2]
         type: hash
         locations: [4,4]
-
-    - 
+    -
         db : hidb
         table: test_hash
         key: id
         nodes: [node1, node2]
         type: hash
         locations: [4,4]
-    -   
+    -
         db : kingshard
         table: test_shard_range
         key: id
diff --git a/proxy/server/conn_preshard.go b/proxy/server/conn_preshard.go
index 1b9c55e9..6f783f73 100644
--- a/proxy/server/conn_preshard.go
+++ b/proxy/server/conn_preshard.go
@@ -30,6 +30,7 @@ import (
 type ExecuteDB struct {
 	ExecNode *backend.Node
 	IsSlave  bool
+	db       string
 	sql      string
 }
 
@@ -210,6 +211,17 @@ func (c *ClientConn) setExecuteNode(tokens []string, tokensLen int, executeDB *E
 	}
 
 	if executeDB.ExecNode == nil {
+		if c.db != "" && executeDB.db == "" {
+			executeDB.db = c.db
+		}
+		if executeDB.db != "" {
+			// get default db nodes from rules
+			rule := c.schema.rule.Rules[executeDB.db][""]
+			if rule != nil && len(rule.Nodes) > 0 {
+				executeDB.ExecNode = c.proxy.GetNode(rule.Nodes[0])
+				return nil
+			}
+		}
 		defaultRule := c.schema.rule.DefaultRule
 		if len(defaultRule.Nodes) == 0 {
 			return errors.ErrNoDefaultNode
@@ -239,6 +251,7 @@ func (c *ClientConn) getSelectExecDB(sql string, tokens []string, tokensLen int)
 					//if the token[i+1] like this:kingshard.test_shard_hash
 					if DBName != "" {
 						ruleDB = DBName
+						executeDB.db = DBName
 					} else {
 						ruleDB = c.db
 					}
@@ -288,6 +301,7 @@ func (c *ClientConn) getDeleteExecDB(sql string, tokens []string, tokensLen int)
 					//if the token[i+1] like this:kingshard.test_shard_hash
 					if DBName != "" {
 						ruleDB = DBName
+						executeDB.db = DBName
 					} else {
 						ruleDB = c.db
 					}
@@ -326,6 +340,7 @@ func (c *ClientConn) getInsertOrReplaceExecDB(sql string, tokens []string, token
 					//if the token[i+1] like this:kingshard.test_shard_hash
 					if DBName != "" {
 						ruleDB = DBName
+						executeDB.db = DBName
 					} else {
 						ruleDB = c.db
 					}
@@ -363,6 +378,7 @@ func (c *ClientConn) getUpdateExecDB(sql string, tokens []string, tokensLen int)
 				//if the token[i+1] like this:kingshard.test_shard_hash
 				if DBName != "" {
 					ruleDB = DBName
+					executeDB.db = DBName
 				} else {
 					ruleDB = c.db
 				}
@@ -457,6 +473,7 @@ func (c *ClientConn) handleShowColumns(sql string, tokens []string,
 				//get the ruleDB
 				if i+4 < tokensLen && strings.ToLower(tokens[i+1]) == mysql.TK_STR_FROM {
 					ruleDB = strings.Trim(tokens[i+4], "`")
+					executeDB.db = ruleDB
 				} else {
 					ruleDB = c.db
 				}
@@ -494,6 +511,7 @@ func (c *ClientConn) getTruncateExecDB(sql string, tokens []string, tokensLen in
 		//if the token[i+1] like this:kingshard.test_shard_hash
 		if DBName != "" {
 			ruleDB = DBName
+			executeDB.db = DBName
 		} else {
 			ruleDB = c.db
 		}
diff --git a/proxy/server/conn_query.go b/proxy/server/conn_query.go
index 22ec0217..ef5c7d8c 100644
--- a/proxy/server/conn_query.go
+++ b/proxy/server/conn_query.go
@@ -113,6 +113,21 @@ func (c *ClientConn) handleQuery(sql string) (err error) {
 	return nil
 }
 
+func (c *ClientConn) getExecuteNode() (*backend.Node, error) {
+	if c.db != "" {
+		rule := c.schema.rule.Rules[c.db][""]
+		if rule != nil && len(rule.Nodes) > 0 {
+			return c.proxy.GetNode(rule.Nodes[0]), nil
+		}
+	}
+	// fallback to default
+	defaultRule := c.schema.rule.DefaultRule
+	if len(defaultRule.Nodes) == 0 {
+		return nil, errors.ErrNoDefaultNode
+	}
+	return c.proxy.GetNode(defaultRule.Nodes[0]), nil
+}
+
 func (c *ClientConn) getBackendConn(n *backend.Node, fromSlave bool) (co *backend.BackendConn, err error) {
 	if !c.isInTransaction() {
 		if fromSlave {
diff --git a/proxy/server/conn_stmt.go b/proxy/server/conn_stmt.go
index a5d258a8..9735d600 100644
--- a/proxy/server/conn_stmt.go
+++ b/proxy/server/conn_stmt.go
@@ -21,7 +21,6 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/flike/kingshard/core/errors"
 	"github.com/flike/kingshard/core/golog"
 	"github.com/flike/kingshard/mysql"
 	"github.com/flike/kingshard/sqlparser"
@@ -72,9 +71,10 @@ func (c *ClientConn) handleStmtPrepare(sql string) error {
 
 	s.sql = sql
 
-	defaultRule := c.schema.rule.DefaultRule
-
-	n := c.proxy.GetNode(defaultRule.Nodes[0])
+	n, err := c.getExecuteNode()
+	if err != nil {
+		return err
+	}
 
 	co, err := c.getBackendConn(n, false)
 	defer c.closeConn(co, false)
@@ -258,14 +258,13 @@ func (c *ClientConn) handleStmtExecute(data []byte) error {
 }
 
 func (c *ClientConn) handlePrepareSelect(stmt *sqlparser.Select, sql string, args []interface{}) error {
-	defaultRule := c.schema.rule.DefaultRule
-	if len(defaultRule.Nodes) == 0 {
-		return errors.ErrNoDefaultNode
+	n, err := c.getExecuteNode()
+	if err != nil {
+		return err
 	}
-	defaultNode := c.proxy.GetNode(defaultRule.Nodes[0])
 
 	//choose connection in slave DB first
-	conn, err := c.getBackendConn(defaultNode, true)
+	conn, err := c.getBackendConn(n, true)
 	defer c.closeConn(conn, false)
 	if err != nil {
 		return err
@@ -295,14 +294,13 @@ func (c *ClientConn) handlePrepareSelect(stmt *sqlparser.Select, sql string, arg
 }
 
 func (c *ClientConn) handlePrepareExec(stmt sqlparser.Statement, sql string, args []interface{}) error {
-	defaultRule := c.schema.rule.DefaultRule
-	if len(defaultRule.Nodes) == 0 {
-		return errors.ErrNoDefaultNode
+	n, err := c.getExecuteNode()
+	if err != nil {
+		return err
 	}
-	defaultNode := c.proxy.GetNode(defaultRule.Nodes[0])
 
 	//execute in Master DB
-	conn, err := c.getBackendConn(defaultNode, false)
+	conn, err := c.getBackendConn(n, false)
 	defer c.closeConn(conn, false)
 	if err != nil {
 		return err