diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index 13ef8b79a5214940e38249eadefd488452eaecfa..fb2efda8e4cf46febc2880da7c13e37fe61e0c15 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -17,7 +17,7 @@
 
 static int32_t tsdbOpenBICache(STsdb *pTsdb) {
   int32_t    code = 0;
-  SLRUCache *pCache = taosLRUCacheInit(1 * 1024 * 1024, -1, .5);
+  SLRUCache *pCache = taosLRUCacheInit(5 * 1024 * 1024, -1, .5);
   if (pCache == NULL) {
     code = TSDB_CODE_OUT_OF_MEMORY;
     goto _err;