Enlarge the SQLite database cache intelligently.

src/cpp/database/SqliteDatabase.cpp

@@ -196,11 +196,18 @@ uint64 SqliteDatabase::getBigInt(int colIndex)
 	return(sqlite3_column_int64(mCurrentStmt, colIndex));
 }
 
-int SqliteDatabase::getKBUsed()
+int SqliteDatabase::getKBUsedAll()
 {
 	return static_cast<int>(sqlite3_memory_used() / 1024);
 }
 
+int SqliteDatabase::getKBUsedDB()
+{
+	int cur = 0, hiw = 0;
+	sqlite3_db_status(mConnection, SQLITE_DBSTATUS_CACHE_USED, &cur, &hiw, 0);
+	return cur / 1024;
+}
+
 static int SqliteWALHook(void *s, sqlite3* dbCon, const char *dbName, int walSize)
 {
 	(reinterpret_cast<SqliteDatabase*>(s))->doHook(dbName, walSize);

src/cpp/database/SqliteDatabase.h

@@ -58,7 +58,8 @@ public:
 	void runWal();
 	void doHook(const char *db, int walSize);
 
-	int getKBUsed();
+	int getKBUsedDB();
+	int getKBUsedAll();
 };
 
 class SqliteStatement

src/cpp/database/database.h

@@ -89,7 +89,8 @@ public:
 
 	virtual bool setupCheckpointing(JobQueue*)	{ return false; }
 	virtual SqliteDatabase* getSqliteDB()		{ return NULL; }
-	virtual int getKBUsed()						{ return -1; }
+	virtual int getKBUsedAll()					{ return -1; }
+	virtual int getKBUsedDB()					{ return -1; }
 };
 
 #endif