diff --git a/src/ripple/app/rdb/backend/MemoryDatabase.h b/src/ripple/app/rdb/backend/MemoryDatabase.h
new file mode 100644
index 000000000..24c8ea315
--- /dev/null
+++ b/src/ripple/app/rdb/backend/MemoryDatabase.h
@@ -0,0 +1,143 @@
+#ifndef RIPPLE_APP_RDB_BACKEND_MEMORYDATABASE_H_INCLUDED
+#define RIPPLE_APP_RDB_BACKEND_MEMORYDATABASE_H_INCLUDED
+#include <ripple/app/rdb/RelationalDatabase.h>
+#include <boost/container/flat_map.hpp>
+#include <shared_mutex>
+
+namespace ripple {
+
+class MemoryDatabase : public RelationalDatabase
+{
+private:
+    mutable std::shared_mutex mutex_;
+    boost::container::flat_map<LedgerIndex, LedgerInfo> ledgers_;
+    boost::container::flat_map<uint256, LedgerInfo> ledgersByHash_;
+    boost::container::flat_map<LedgerIndex, LedgerHashPair> ledgerHashes_;
+    std::vector<std::shared_ptr<Transaction>> txHistory_;
+
+public:
+    MemoryDatabase(ripple::Application& app, ripple::Config const& conf, ripple::JobQueue& jq)
+    {
+    }
+
+    std::optional<LedgerIndex> getMinLedgerSeq() override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        if (ledgers_.empty())
+            return {};
+        return ledgers_.begin()->first;
+    }
+
+    std::optional<LedgerIndex> getMaxLedgerSeq() override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        if (ledgers_.empty())
+            return {};
+        return ledgers_.rbegin()->first;
+    }
+
+    std::optional<LedgerInfo> getLedgerInfoByIndex(LedgerIndex ledgerSeq) override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        auto it = ledgers_.find(ledgerSeq);
+        if (it == ledgers_.end())
+            return {};
+        return it->second;
+    }
+
+    std::optional<LedgerInfo> getNewestLedgerInfo() override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        if (ledgers_.empty())
+            return {};
+        return ledgers_.rbegin()->second;
+    }
+
+    std::optional<LedgerInfo> getLedgerInfoByHash(uint256 const& ledgerHash) override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        auto it = ledgersByHash_.find(ledgerHash);
+        if (it == ledgersByHash_.end())
+            return {};
+        return it->second;
+    }
+
+    uint256 getHashByIndex(LedgerIndex ledgerIndex) override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        auto it = ledgerHashes_.find(ledgerIndex);
+        if (it == ledgerHashes_.end())
+            return {};
+        return it->second.ledgerHash;
+    }
+
+    std::optional<LedgerHashPair> getHashesByIndex(LedgerIndex ledgerIndex) override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        auto it = ledgerHashes_.find(ledgerIndex);
+        if (it == ledgerHashes_.end())
+            return {};
+        return it->second;
+    }
+
+    std::map<LedgerIndex, LedgerHashPair> getHashesByIndex(LedgerIndex minSeq, LedgerIndex maxSeq) override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        std::map<LedgerIndex, LedgerHashPair> result;
+        auto it = ledgerHashes_.lower_bound(minSeq);
+        auto end = ledgerHashes_.upper_bound(maxSeq);
+        for (; it != end; ++it)
+        {
+            result[it->first] = it->second;
+        }
+        return result;
+    }
+
+    std::vector<std::shared_ptr<Transaction>> getTxHistory(LedgerIndex startIndex) override
+    {
+        std::shared_lock<std::shared_mutex> lock(mutex_);
+        if (startIndex >= txHistory_.size())
+            return {};
+        return std::vector<std::shared_ptr<Transaction>>(
+            txHistory_.begin() + startIndex,
+            txHistory_.begin() + std::min(static_cast<size_t>(startIndex + 20), txHistory_.size()));
+    }
+
+    bool ledgerDbHasSpace(Config const& config) override
+    {
+        // In-memory database always has space
+        return true;
+    }
+
+    bool transactionDbHasSpace(Config const& config) override
+    {
+        // In-memory database always has space
+        return true;
+    }
+
+    // Add methods to insert data (these would be called when saving ledgers/transactions)
+    void insertLedger(LedgerInfo const& ledgerInfo)
+    {
+        std::unique_lock<std::shared_mutex> lock(mutex_);
+        ledgers_[ledgerInfo.seq] = ledgerInfo;
+        ledgersByHash_[ledgerInfo.hash] = ledgerInfo;
+        ledgerHashes_[ledgerInfo.seq] = {ledgerInfo.hash, ledgerInfo.parentHash};
+    }
+
+    void insertTransaction(std::shared_ptr<Transaction> const& tx)
+    {
+        std::unique_lock<std::shared_mutex> lock(mutex_);
+        txHistory_.push_back(tx);
+    }
+};
+
+std::unique_ptr<RelationalDatabase>
+getMemoryDatabase(Application& app, Config const& config, JobQueue& jobQueue)
+{
+    return std::make_unique<MemoryDatabase>(app, config, jobQueue);
+}
+
+
+
+} // namespace ripple
+#endif
diff --git a/src/ripple/app/rdb/impl/RelationalDatabase.cpp b/src/ripple/app/rdb/impl/RelationalDatabase.cpp
index 8a3ce5b01..d7104d3b8 100644
--- a/src/ripple/app/rdb/impl/RelationalDatabase.cpp
+++ b/src/ripple/app/rdb/impl/RelationalDatabase.cpp
@@ -21,6 +21,7 @@
 #include <ripple/app/rdb/RelationalDatabase.h>
 #include <ripple/core/ConfigSections.h>
 #include <ripple/nodestore/DatabaseShard.h>
+#include <ripple/app/rdb/backend/MemoryDatabase.h>
 
 namespace ripple {
 
@@ -38,6 +39,7 @@ RelationalDatabase::init(
 {
     bool use_sqlite = false;
     bool use_postgres = false;
+    bool use_memory = false;
 
     if (config.reporting())
     {
@@ -52,6 +54,10 @@ RelationalDatabase::init(
             {
                 use_sqlite = true;
             }
+            else if (boost::iequals(get(rdb_section, "backend"), "memory"))
+            {
+                use_memory = true;
+            }
             else
             {
                 Throw<std::runtime_error>(
@@ -73,6 +79,10 @@ RelationalDatabase::init(
     {
         return getPostgresDatabase(app, config, jobQueue);
     }
+    else if (use_memory)
+    {
+        return getMemoryDatabase(app, config, jobQueue);
+    }
 
     return std::unique_ptr<RelationalDatabase>();
 }