diff --git a/dbms/src/Storages/KVStore/Decode/RegionTable.cpp b/dbms/src/Storages/KVStore/Decode/RegionTable.cpp
index dd5793cbdd7..0091c19b1b3 100644
--- a/dbms/src/Storages/KVStore/Decode/RegionTable.cpp
+++ b/dbms/src/Storages/KVStore/Decode/RegionTable.cpp
@@ -46,9 +46,11 @@ namespace FailPoints
 extern const char force_set_num_regions_for_table[];
 } // namespace FailPoints
 
-void RegionTable::InternalRegion::updateRegionCacheBytes(size_t cache_bytes_)
+int64_t RegionTable::InternalRegion::updateRegionCacheBytes(size_t cache_bytes_)
 {
+    auto diff = static_cast<int64_t>(cache_bytes_) - static_cast<int64_t>(cache_bytes);
     cache_bytes = cache_bytes_;
+    return diff;
 }
 
 RegionTable::Table & RegionTable::getOrCreateTable(const KeyspaceID keyspace_id, const TableID table_id)
@@ -64,31 +66,45 @@ RegionTable::Table & RegionTable::getOrCreateTable(const KeyspaceID keyspace_id,
     return it->second;
 }
 
+bool RegionTable::hasTable(KeyspaceID keyspace_id, TableID table_id)
+{
+    auto ks_table_id = KeyspaceTableID{keyspace_id, table_id};
+    auto it = tables.find(ks_table_id);
+    if (it == tables.end())
+    {
+        return false;
+    }
+    return true;
+}
+
+
 RegionTable::InternalRegion & RegionTable::insertRegion(Table & table, const Region & region)
 {
     const auto range = region.getRange();
-    return insertRegion(table, *range, region.id());
+    return insertRegion(table, *range, region);
 }
 
 RegionTable::InternalRegion & RegionTable::insertRegion(
     Table & table,
     const RegionRangeKeys & region_range_keys,
-    const RegionID region_id)
+    const Region & region)
 {
     auto keyspace_id = region_range_keys.getKeyspaceID();
     auto & table_regions = table.regions;
     // Insert table mapping.
     // todo check if region_range_keys.mapped_table_id == table.table_id ??
-    auto [it, ok] = table_regions.emplace(region_id, InternalRegion(region_id, region_range_keys.rawKeys()));
+    auto [it, ok] = table_regions.emplace(region.id(), InternalRegion(region.id(), region_range_keys.rawKeys()));
     if (!ok)
         throw Exception(
             ErrorCodes::LOGICAL_ERROR,
             "{}: insert duplicate internal region, region_id={}",
             __PRETTY_FUNCTION__,
-            region_id);
+            region.id());
 
     // Insert region mapping.
-    regions[region_id] = KeyspaceTableID{keyspace_id, table.table_id};
+    regions[region.id()] = KeyspaceTableID{keyspace_id, table.table_id};
+
+    table.updateTableCacheBytes(it->second.updateRegionCacheBytes(region.totalSize()));
 
     return it->second;
 }
@@ -110,6 +126,14 @@ RegionTable::InternalRegion & RegionTable::getOrInsertRegion(const Region & regi
     return insertRegion(table, region);
 }
 
+void RegionTable::updateTableCacheBytes(const Region & region, int64_t diff)
+{
+    auto keyspace_id = region.getKeyspaceID();
+    auto table_id = region.getMappedTableID();
+    auto & table = getOrCreateTable(keyspace_id, table_id);
+    table.updateTableCacheBytes(diff);
+}
+
 RegionTable::RegionTable(Context & context_)
     : context(&context_)
     , log(Logger::get())
@@ -161,7 +185,7 @@ void RegionTable::updateRegion(const Region & region)
 {
     std::lock_guard lock(mutex);
     auto & internal_region = getOrInsertRegion(region);
-    internal_region.updateRegionCacheBytes(region.dataSize());
+    updateTableCacheBytes(region, internal_region.updateRegionCacheBytes(region.totalSize()));
 }
 
 namespace
@@ -313,7 +337,7 @@ RegionDataReadInfoList RegionTable::tryWriteBlockByRegion(const RegionPtr & regi
 
     func_update_region([&](InternalRegion & internal_region) -> bool {
         internal_region.pause_flush = false;
-        internal_region.updateRegionCacheBytes(region->dataSize());
+        updateTableCacheBytes(*region, internal_region.updateRegionCacheBytes(region->totalSize()));
 
         internal_region.last_flush_time = Clock::now();
         return true;
@@ -385,10 +409,10 @@ void RegionTable::shrinkRegionRange(const Region & region)
     std::lock_guard lock(mutex);
     auto & internal_region = getOrInsertRegion(region);
     internal_region.range_in_table = region.getRange()->rawKeys();
-    internal_region.updateRegionCacheBytes(region.dataSize());
+    updateTableCacheBytes(region, internal_region.updateRegionCacheBytes(region.totalSize()));
 }
 
-void RegionTable::extendRegionRange(const RegionID region_id, const RegionRangeKeys & region_range_keys)
+void RegionTable::extendRegionRange(const Region & region, const RegionRangeKeys & region_range_keys)
 {
     std::lock_guard lock(mutex);
 
@@ -396,7 +420,7 @@ void RegionTable::extendRegionRange(const RegionID region_id, const RegionRangeK
     auto table_id = region_range_keys.getMappedTableID();
     auto new_handle_range = region_range_keys.rawKeys();
 
-    if (auto it = regions.find(region_id); it != regions.end())
+    if (auto it = regions.find(region.id()); it != regions.end())
     {
         auto ks_tbl_id = KeyspaceTableID{keyspace_id, table_id};
         RUNTIME_CHECK_MSG(
@@ -404,13 +428,13 @@ void RegionTable::extendRegionRange(const RegionID region_id, const RegionRangeK
             "{}: table id not match the previous one"
             ", region_id={} keyspace={} table_id={} old_keyspace={} old_table_id={}",
             __PRETTY_FUNCTION__,
-            region_id,
+            region.id(),
             keyspace_id,
             table_id,
             it->second.first,
             it->second.second);
 
-        InternalRegion & internal_region = doGetInternalRegion(ks_tbl_id, region_id);
+        InternalRegion & internal_region = doGetInternalRegion(ks_tbl_id, region.id());
 
         if (*(internal_region.range_in_table.first) <= *(new_handle_range.first)
             && *(internal_region.range_in_table.second) >= *(new_handle_range.second))
@@ -420,7 +444,7 @@ void RegionTable::extendRegionRange(const RegionID region_id, const RegionRangeK
                 "internal region has larger range, keyspace={} table_id={} region_id={}",
                 keyspace_id,
                 table_id,
-                region_id);
+                region.id());
         }
         else
         {
@@ -435,8 +459,13 @@ void RegionTable::extendRegionRange(const RegionID region_id, const RegionRangeK
     else
     {
         auto & table = getOrCreateTable(keyspace_id, table_id);
-        insertRegion(table, region_range_keys, region_id);
-        LOG_INFO(log, "insert internal region, keyspace={} table_id={} region_id={}", keyspace_id, table_id, region_id);
+        insertRegion(table, region_range_keys, region);
+        LOG_INFO(
+            log,
+            "insert internal region, keyspace={} table_id={} region_id={}",
+            keyspace_id,
+            table_id,
+            region.id());
     }
 }
 
diff --git a/dbms/src/Storages/KVStore/Decode/RegionTable.h b/dbms/src/Storages/KVStore/Decode/RegionTable.h
index 60d10785322..90446d86be2 100644
--- a/dbms/src/Storages/KVStore/Decode/RegionTable.h
+++ b/dbms/src/Storages/KVStore/Decode/RegionTable.h
@@ -78,11 +78,11 @@ class RegionTable : private boost::noncopyable
             , range_in_table(range_in_table_)
         {}
 
-        void updateRegionCacheBytes(size_t);
+        int64_t updateRegionCacheBytes(size_t);
 
         RegionID region_id;
         std::pair<DecodedTiKVKeyPtr, DecodedTiKVKeyPtr> range_in_table;
-        bool pause_flush = false;
+        bool pause_flush = false; // TODO Can we remove this?
         Timepoint last_flush_time = Clock::now();
 
     private:
@@ -95,11 +95,18 @@ class RegionTable : private boost::noncopyable
     {
         explicit Table(const TableID table_id_)
             : table_id(table_id_)
+            , size(0)
         {}
+        void updateTableCacheBytes(UInt64 diff) { size.fetch_add(diff); }
         TableID table_id;
         InternalRegions regions;
+
+    private:
+        std::atomic_int64_t size;
     };
 
+    void updateTableCacheBytes(const Region &, int64_t);
+
     explicit RegionTable(Context & context_);
     void restore();
 
@@ -109,7 +116,7 @@ class RegionTable : private boost::noncopyable
     void shrinkRegionRange(const Region & region);
 
     /// extend range for possible InternalRegion or add one.
-    void extendRegionRange(RegionID region_id, const RegionRangeKeys & region_range_keys);
+    void extendRegionRange(const Region & region, const RegionRangeKeys & region_range_keys);
 
     void removeRegion(RegionID region_id, bool remove_data, const RegionTaskLock &);
 
@@ -151,6 +158,7 @@ class RegionTable : private boost::noncopyable
         const LoggerPtr & log);
 
     void clear();
+    bool hasTable(KeyspaceID keyspace_id, TableID table_id);
 
 public:
     // safe ts is maintained by check_leader RPC (https://github.com/tikv/tikv/blob/1ea26a2ac8761af356cc5c0825eb89a0b8fc9749/components/resolved_ts/src/advance.rs#L262),
@@ -183,7 +191,7 @@ class RegionTable : private boost::noncopyable
     Table & getOrCreateTable(KeyspaceID keyspace_id, TableID table_id);
     void removeTable(KeyspaceID keyspace_id, TableID table_id);
     InternalRegion & getOrInsertRegion(const Region & region);
-    InternalRegion & insertRegion(Table & table, const RegionRangeKeys & region_range_keys, RegionID region_id);
+    InternalRegion & insertRegion(Table & table, const RegionRangeKeys & region_range_keys, const Region & region);
     InternalRegion & insertRegion(Table & table, const Region & region);
     InternalRegion & doGetInternalRegion(KeyspaceTableID ks_table_id, RegionID region_id);
 
diff --git a/dbms/src/Storages/KVStore/MultiRaft/ApplySnapshot.cpp b/dbms/src/Storages/KVStore/MultiRaft/ApplySnapshot.cpp
index d01c3aab43e..cd8474c2690 100644
--- a/dbms/src/Storages/KVStore/MultiRaft/ApplySnapshot.cpp
+++ b/dbms/src/Storages/KVStore/MultiRaft/ApplySnapshot.cpp
@@ -277,7 +277,7 @@ void KVStore::onSnapshot(
         const auto range = new_region_wrap->getRange();
         auto & region_table = tmt.getRegionTable();
         // extend region to make sure data won't be removed.
-        region_table.extendRegionRange(region_id, *range);
+        region_table.extendRegionRange(*new_region_wrap, *range);
     }
 
     // Register the new Region.
diff --git a/dbms/src/Storages/KVStore/MultiRaft/RaftCommands.cpp b/dbms/src/Storages/KVStore/MultiRaft/RaftCommands.cpp
index a1883bca63b..c4f52f79901 100644
--- a/dbms/src/Storages/KVStore/MultiRaft/RaftCommands.cpp
+++ b/dbms/src/Storages/KVStore/MultiRaft/RaftCommands.cpp
@@ -199,7 +199,7 @@ RegionID RegionRaftCommandDelegate::execCommitMerge(
             : source_region_meta_delegate.regionState().getRegion().end_key();
 
         region_table.extendRegionRange(
-            id(),
+            *this,
             RegionRangeKeys(TiKVKey::copyFrom(new_start_key), TiKVKey::copyFrom(new_end_key)));
     }
 
diff --git a/dbms/src/Storages/KVStore/Region.cpp b/dbms/src/Storages/KVStore/Region.cpp
index c0fb112bb19..d1f4a35c1b7 100644
--- a/dbms/src/Storages/KVStore/Region.cpp
+++ b/dbms/src/Storages/KVStore/Region.cpp
@@ -185,6 +185,12 @@ size_t Region::dataSize() const
     return data.dataSize();
 }
 
+size_t Region::totalSize() const
+{
+    return data.totalSize() + sizeof(RegionMeta);
+}
+
+
 size_t Region::writeCFCount() const
 {
     std::shared_lock<std::shared_mutex> lock(mutex);
diff --git a/dbms/src/Storages/KVStore/Region.h b/dbms/src/Storages/KVStore/Region.h
index da5ed6166d9..3bd86e61ced 100644
--- a/dbms/src/Storages/KVStore/Region.h
+++ b/dbms/src/Storages/KVStore/Region.h
@@ -165,6 +165,8 @@ class Region : public std::enable_shared_from_this<Region>
 
     // Payload size in RegionData, show how much data flows in/out of the Region.
     size_t dataSize() const;
+    // How much memory the Region consumes.
+    size_t totalSize() const;
     size_t writeCFCount() const;
     std::string dataInfo() const;
 
diff --git a/dbms/src/Storages/KVStore/tests/gtest_new_kvstore.cpp b/dbms/src/Storages/KVStore/tests/gtest_new_kvstore.cpp
index f9c85dd2a27..fa555f1cbdd 100644
--- a/dbms/src/Storages/KVStore/tests/gtest_new_kvstore.cpp
+++ b/dbms/src/Storages/KVStore/tests/gtest_new_kvstore.cpp
@@ -95,6 +95,8 @@ try
          {RecordKVFormat::genKey(table_id, 11), RecordKVFormat::genKey(table_id, 20)},
          {RecordKVFormat::genKey(table_id, 21), RecordKVFormat::genKey(table_id, 30)}});
 
+    auto & region_table = ctx.getTMTContext().getRegionTable();
+    ASSERT_TRUE(region_table.hasTable(NullspaceID, table_id));
     {
         // default
         auto region_id = 1;