diff --git a/config/datanode.example.toml b/config/datanode.example.toml
index 2a1c97b16f08..d646fb93737b 100644
--- a/config/datanode.example.toml
+++ b/config/datanode.example.toml
@@ -105,8 +105,8 @@ global_write_buffer_reject_size = "2GB"
 sst_meta_cache_size = "128MB"
 # Cache size for vectors and arrow arrays (default 512MB). Setting it to 0 to disable the cache.
 vector_cache_size = "512MB"
-# Cache size for pages of SST row groups (default 2GB). Setting it to 0 to disable the cache.
-page_cache_size = "2GB"
+# Cache size for pages of SST row groups (default 512MB). Setting it to 0 to disable the cache.
+page_cache_size = "512MB"
 # Buffer size for SST writing.
 sst_write_buffer_size = "8MB"
 
diff --git a/config/standalone.example.toml b/config/standalone.example.toml
index e03014ca66db..b355896130d8 100644
--- a/config/standalone.example.toml
+++ b/config/standalone.example.toml
@@ -177,8 +177,8 @@ global_write_buffer_reject_size = "2GB"
 sst_meta_cache_size = "128MB"
 # Cache size for vectors and arrow arrays (default 512MB). Setting it to 0 to disable the cache.
 vector_cache_size = "512MB"
-# Cache size for pages of SST row groups (default 2GB). Setting it to 0 to disable the cache.
-page_cache_size = "2GB"
+# Cache size for pages of SST row groups (default 512MB). Setting it to 0 to disable the cache.
+page_cache_size = "512MB"
 # Buffer size for SST writing.
 sst_write_buffer_size = "8MB"
 
diff --git a/src/mito2/src/config.rs b/src/mito2/src/config.rs
index f58266fd0db1..a51d469de3b5 100644
--- a/src/mito2/src/config.rs
+++ b/src/mito2/src/config.rs
@@ -65,7 +65,7 @@ pub struct MitoConfig {
     pub sst_meta_cache_size: ReadableSize,
     /// Cache size for vectors and arrow arrays (default 512MB). Setting it to 0 to disable the cache.
     pub vector_cache_size: ReadableSize,
-    /// Cache size for pages of SST row groups (default 2GB). Setting it to 0 to disable the cache.
+    /// Cache size for pages of SST row groups (default 512MB). Setting it to 0 to disable the cache.
     pub page_cache_size: ReadableSize,
 
     // Other configs:
@@ -87,7 +87,7 @@ impl Default for MitoConfig {
             global_write_buffer_reject_size: ReadableSize::gb(2),
             sst_meta_cache_size: ReadableSize::mb(128),
             vector_cache_size: ReadableSize::mb(512),
-            page_cache_size: ReadableSize::gb(2),
+            page_cache_size: ReadableSize::mb(512),
             sst_write_buffer_size: ReadableSize::mb(8),
         }
     }