From 95eb1f00bca268353852c9ce9e40e4e3d3492bf8 Mon Sep 17 00:00:00 2001
From: emeric <emeric.poupon@laposte.net>
Date: Sun, 21 Jun 2026 17:00:36 +0200
Subject: [PATCH] Log mmap size used by sqlite3

---
 src/libs/database/impl/Db.cpp | 28 ++++++++++++++++++++++++++++
 src/libs/database/impl/Db.hpp |  1 +
 2 files changed, 29 insertions(+)

diff --git a/src/libs/database/impl/Db.cpp b/src/libs/database/impl/Db.cpp
index 550f6d4a..6d242777 100644
--- a/src/libs/database/impl/Db.cpp
+++ b/src/libs/database/impl/Db.cpp
@@ -170,6 +170,24 @@ namespace lms::db
             return res;
         }
 
+        std::optional<long long> getMmapSize(Wt::Dbo::SqlConnection& connection)
+        {
+            auto statement = connection.prepareStatement("PRAGMA mmap_size");
+            statement->execute();
+
+            std::optional<long long> res;
+            while (statement->nextRow())
+            {
+                assert(!res);
+                long long value{};
+                if (statement->getResult(0, &value))
+                    res = value;
+                break;
+            }
+
+            return res;
+        }
+
         void getCompileOptions(Wt::Dbo::SqlConnection& connection, std::function<void(std::string_view compileOption)> callback)
         {
             auto statement = connection.prepareStatement("PRAGMA compile_options");
@@ -217,6 +235,7 @@ namespace lms::db
 
         logPageSize();
         logCacheSize();
+        logMmapSize();
         logCompileOptions();
         if (checkType == "quick")
         {
@@ -278,6 +297,15 @@ namespace lms::db
             LMS_LOG(DB, INFO, "Cache size set to " << *cacheSize);
     }
 
+    void Db::logMmapSize()
+    {
+        ScopedConnection connection{ *_connectionPool };
+        const std::optional<long long> mmapSize{ getMmapSize(*connection) };
+
+        if (mmapSize)
+            LMS_LOG(DB, INFO, "Mmap size set to " << *mmapSize);
+    }
+
     void Db::logCompileOptions()
     {
         ScopedConnection connection{ *_connectionPool };
diff --git a/src/libs/database/impl/Db.hpp b/src/libs/database/impl/Db.hpp
index 63890021..5b5c1845 100644
--- a/src/libs/database/impl/Db.hpp
+++ b/src/libs/database/impl/Db.hpp
@@ -51,6 +51,7 @@ namespace lms::db
 
         void logPageSize();
         void logCacheSize();
+        void logMmapSize();
         void logCompileOptions();
         void performQuickCheck();
         void performIntegrityCheck();