diff --git a/internal/topo/node/cache/sync_cache.go b/internal/topo/node/cache/sync_cache.go
index 5c7f55d30d..a1d132f93b 100644
--- a/internal/topo/node/cache/sync_cache.go
+++ b/internal/topo/node/cache/sync_cache.go
@@ -136,8 +136,11 @@ func NewSyncCache(ctx api.StreamContext, cacheConf *conf.SinkConf) (*SyncCache,
 		writeBufferPage: newPage(cacheConf.BufferPageSize),
 		readBufferPage:  newPage(cacheConf.BufferPageSize),
 	}
-	err := c.initStore(ctx)
-	return c, err
+	return c, nil
+}
+
+func (c *SyncCache) InitStore(ctx api.StreamContext) error {
+	return c.initStore(ctx)
 }
 
 func (c *SyncCache) SetupMeta(ctx api.StreamContext) {
diff --git a/internal/topo/node/cache/sync_cache_test.go b/internal/topo/node/cache/sync_cache_test.go
index b2f582f3be..bdebd6288e 100644
--- a/internal/topo/node/cache/sync_cache_test.go
+++ b/internal/topo/node/cache/sync_cache_test.go
@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/lf-edge/ekuiper/v2/internal/conf"
 	"github.com/lf-edge/ekuiper/v2/internal/pkg/def"
@@ -130,6 +131,7 @@ func TestCache(t *testing.T) {
 		CleanCacheAtStop: false,
 	})
 	assert.NoError(t, err)
+	require.NoError(t, s.InitStore(ctx))
 	// prepare data
 	tuples := make([]any, 15)
 	for i := 0; i < 15; i++ {
@@ -234,6 +236,7 @@ func TestCacheCase2(t *testing.T) {
 		ResendInterval:       cast.DurationConf(10 * time.Millisecond),
 	})
 	assert.NoError(t, err)
+	require.NoError(t, s.InitStore(ctx))
 	// prepare data
 	tuples := make([]any, 15)
 	for i := 0; i < 15; i++ {
@@ -337,6 +340,7 @@ func TestCacheInit(t *testing.T) {
 		CleanCacheAtStop:     false,
 	})
 	assert.NoError(t, err)
+	require.NoError(t, s.InitStore(ctx))
 	// prepare data
 	tuples := make([]any, 10)
 	for i := 0; i < 10; i++ {
@@ -361,6 +365,7 @@ func TestCacheInit(t *testing.T) {
 		CleanCacheAtStop:     false,
 	})
 	assert.NoError(t, err)
+	require.NoError(t, s.InitStore(ctx))
 	r, _ := s.PopCache(ctx)
 	assert.Equal(t, 3, s.CacheLength, "cache length after pop")
 	assert.Equal(t, &xsql.RawTuple{
@@ -380,6 +385,7 @@ func TestCacheInit(t *testing.T) {
 		CleanCacheAtStop:     false,
 	})
 	assert.NoError(t, err)
+	require.NoError(t, s.InitStore(ctx))
 	r, _ = s.PopCache(ctx)
 	assert.Equal(t, 2, s.CacheLength, "cache length after pop")
 	assert.Equal(t, &xsql.RawTuple{
diff --git a/internal/topo/node/cache_op.go b/internal/topo/node/cache_op.go
index 5850579453..fd1b16c3f5 100644
--- a/internal/topo/node/cache_op.go
+++ b/internal/topo/node/cache_op.go
@@ -70,6 +70,10 @@ func (s *CacheOp) Exec(ctx api.StreamContext, errCh chan<- error) {
 		infra.DrainError(ctx, fmt.Errorf("cache op should have only 1 output but got %+v", s.outputs), errCh)
 	}
 	s.cache.SetupMeta(ctx)
+	if err := s.cache.InitStore(ctx); err != nil {
+		infra.DrainError(ctx, fmt.Errorf("cache op init store error:%v", err), errCh)
+		return
+	}
 	s.prepareExec(ctx, errCh, "op")
 	go func() {
 		err := infra.SafeRun(func() error {
@@ -105,7 +109,7 @@ func (s *CacheOp) Exec(ctx api.StreamContext, errCh chan<- error) {
 					s.send()
 					s.span = nil
 					s.onProcessEnd(ctx)
-					l := int64(len(s.input) + s.cache.CacheLength)
+					l := int64(len(s.input)) + int64(s.cache.CacheLength)
 					if s.currItem != nil {
 						l += 1
 					}