diff --git a/RomRepoMgr.Database/Context.cs b/RomRepoMgr.Database/Context.cs
index eb8d055..725c448 100644
--- a/RomRepoMgr.Database/Context.cs
+++ b/RomRepoMgr.Database/Context.cs
@@ -77,6 +77,42 @@ namespace RomRepoMgr.Database
                 entity.HasIndex(e => e.Size);
 
                 entity.HasIndex(e => e.IsInRepo);
+
+                entity.HasIndex(e => new
+                {
+                    e.Crc32,
+                    e.Size
+                });
+
+                entity.HasIndex(e => new
+                {
+                    e.Md5,
+                    e.Size
+                });
+
+                entity.HasIndex(e => new
+                {
+                    e.Sha1,
+                    e.Size
+                });
+
+                entity.HasIndex(e => new
+                {
+                    e.Sha256,
+                    e.Size
+                });
+
+                entity.HasIndex(e => new
+                {
+                    e.Sha384,
+                    e.Size
+                });
+
+                entity.HasIndex(e => new
+                {
+                    e.Sha512,
+                    e.Size
+                });
             });
 
             modelBuilder.Entity<RomSet>(entity =>
diff --git a/RomRepoMgr.Database/Migrations/20200911005409_AddCompositeIndexes.Designer.cs b/RomRepoMgr.Database/Migrations/20200911005409_AddCompositeIndexes.Designer.cs
new file mode 100644
index 0000000..c6e82bf
--- /dev/null
+++ b/RomRepoMgr.Database/Migrations/20200911005409_AddCompositeIndexes.Designer.cs
@@ -0,0 +1,473 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using RomRepoMgr.Database;
+
+namespace RomRepoMgr.Database.Migrations
+{
+    [DbContext(typeof(Context))]
+    [Migration("20200911005409_AddCompositeIndexes")]
+    partial class AddCompositeIndexes
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "3.1.7");
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.DbDisk", b =>
+                {
+                    b.Property<ulong>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("CreatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("IsInRepo")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Md5")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(32);
+
+                    b.Property<string>("OriginalFileName")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Sha1")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(40);
+
+                    b.Property<ulong?>("Size")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("UpdatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("IsInRepo");
+
+                    b.HasIndex("Md5");
+
+                    b.HasIndex("Sha1");
+
+                    b.HasIndex("Size");
+
+                    b.ToTable("Disks");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.DbFile", b =>
+                {
+                    b.Property<ulong>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Crc32")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(8);
+
+                    b.Property<DateTime>("CreatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("IsInRepo")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Md5")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(32);
+
+                    b.Property<string>("OriginalFileName")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Sha1")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(40);
+
+                    b.Property<string>("Sha256")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(64);
+
+                    b.Property<string>("Sha384")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(96);
+
+                    b.Property<string>("Sha512")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(128);
+
+                    b.Property<ulong>("Size")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("UpdatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Crc32");
+
+                    b.HasIndex("IsInRepo");
+
+                    b.HasIndex("Md5");
+
+                    b.HasIndex("Sha1");
+
+                    b.HasIndex("Sha256");
+
+                    b.HasIndex("Sha384");
+
+                    b.HasIndex("Sha512");
+
+                    b.HasIndex("Size");
+
+                    b.HasIndex("Crc32", "Size");
+
+                    b.HasIndex("Md5", "Size");
+
+                    b.HasIndex("Sha1", "Size");
+
+                    b.HasIndex("Sha256", "Size");
+
+                    b.HasIndex("Sha384", "Size");
+
+                    b.HasIndex("Sha512", "Size");
+
+                    b.ToTable("Files");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.DbMedia", b =>
+                {
+                    b.Property<ulong>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("CreatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("IsInRepo")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Md5")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(32);
+
+                    b.Property<string>("OriginalFileName")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Sha1")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(40);
+
+                    b.Property<string>("Sha256")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(64);
+
+                    b.Property<ulong?>("Size")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("SpamSum")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("UpdatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("IsInRepo");
+
+                    b.HasIndex("Md5");
+
+                    b.HasIndex("Sha1");
+
+                    b.HasIndex("Sha256");
+
+                    b.HasIndex("Size");
+
+                    b.HasIndex("SpamSum");
+
+                    b.ToTable("Medias");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.DiskByMachine", b =>
+                {
+                    b.Property<ulong>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<ulong>("DiskId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<ulong>("MachineId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("DiskId");
+
+                    b.HasIndex("MachineId");
+
+                    b.HasIndex("Name");
+
+                    b.ToTable("DisksByMachines");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.FileByMachine", b =>
+                {
+                    b.Property<ulong>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<ulong>("FileId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime?>("FileLastModification")
+                        .HasColumnType("TEXT");
+
+                    b.Property<ulong>("MachineId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Path")
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(4096);
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("FileId");
+
+                    b.HasIndex("MachineId");
+
+                    b.HasIndex("Name");
+
+                    b.ToTable("FilesByMachines");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.Machine", b =>
+                {
+                    b.Property<ulong>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("CreatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<long>("RomSetId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<DateTime>("UpdatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Name");
+
+                    b.HasIndex("RomSetId");
+
+                    b.ToTable("Machines");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.MediaByMachine", b =>
+                {
+                    b.Property<ulong>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<ulong>("MachineId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<ulong>("MediaId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MachineId");
+
+                    b.HasIndex("MediaId");
+
+                    b.HasIndex("Name");
+
+                    b.ToTable("MediasByMachines");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.RomSet", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Author")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Category")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Comment")
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("CreatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Date")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Description")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Filename")
+                        .IsRequired()
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Homepage")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Sha384")
+                        .IsRequired()
+                        .HasColumnType("TEXT")
+                        .HasMaxLength(96);
+
+                    b.Property<DateTime>("UpdatedOn")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Version")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Author");
+
+                    b.HasIndex("Category");
+
+                    b.HasIndex("Comment");
+
+                    b.HasIndex("Date");
+
+                    b.HasIndex("Description");
+
+                    b.HasIndex("Filename");
+
+                    b.HasIndex("Homepage");
+
+                    b.HasIndex("Name");
+
+                    b.HasIndex("Sha384");
+
+                    b.HasIndex("Version");
+
+                    b.ToTable("RomSets");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.RomSetStat", b =>
+                {
+                    b.Property<long>("RomSetId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<long>("CompleteMachines")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<long>("HaveRoms")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<long>("IncompleteMachines")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<long>("MissRoms")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<long>("TotalMachines")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<long>("TotalRoms")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("RomSetId");
+
+                    b.ToTable("RomSetStats");
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.DiskByMachine", b =>
+                {
+                    b.HasOne("RomRepoMgr.Database.Models.DbDisk", "Disk")
+                        .WithMany("Machines")
+                        .HasForeignKey("DiskId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("RomRepoMgr.Database.Models.Machine", "Machine")
+                        .WithMany("Disks")
+                        .HasForeignKey("MachineId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.FileByMachine", b =>
+                {
+                    b.HasOne("RomRepoMgr.Database.Models.DbFile", "File")
+                        .WithMany("Machines")
+                        .HasForeignKey("FileId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("RomRepoMgr.Database.Models.Machine", "Machine")
+                        .WithMany("Files")
+                        .HasForeignKey("MachineId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.Machine", b =>
+                {
+                    b.HasOne("RomRepoMgr.Database.Models.RomSet", "RomSet")
+                        .WithMany("Machines")
+                        .HasForeignKey("RomSetId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.MediaByMachine", b =>
+                {
+                    b.HasOne("RomRepoMgr.Database.Models.Machine", "Machine")
+                        .WithMany("Medias")
+                        .HasForeignKey("MachineId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("RomRepoMgr.Database.Models.DbMedia", "Media")
+                        .WithMany("Machines")
+                        .HasForeignKey("MediaId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("RomRepoMgr.Database.Models.RomSetStat", b =>
+                {
+                    b.HasOne("RomRepoMgr.Database.Models.RomSet", "RomSet")
+                        .WithOne("Statistics")
+                        .HasForeignKey("RomRepoMgr.Database.Models.RomSetStat", "RomSetId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/RomRepoMgr.Database/Migrations/20200911005409_AddCompositeIndexes.cs b/RomRepoMgr.Database/Migrations/20200911005409_AddCompositeIndexes.cs
new file mode 100644
index 0000000..a41157a
--- /dev/null
+++ b/RomRepoMgr.Database/Migrations/20200911005409_AddCompositeIndexes.cs
@@ -0,0 +1,55 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace RomRepoMgr.Database.Migrations
+{
+    public partial class AddCompositeIndexes : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateIndex("IX_Files_Crc32_Size", "Files", new[]
+            {
+                "Crc32", "Size"
+            });
+
+            migrationBuilder.CreateIndex("IX_Files_Md5_Size", "Files", new[]
+            {
+                "Md5", "Size"
+            });
+
+            migrationBuilder.CreateIndex("IX_Files_Sha1_Size", "Files", new[]
+            {
+                "Sha1", "Size"
+            });
+
+            migrationBuilder.CreateIndex("IX_Files_Sha256_Size", "Files", new[]
+            {
+                "Sha256", "Size"
+            });
+
+            migrationBuilder.CreateIndex("IX_Files_Sha384_Size", "Files", new[]
+            {
+                "Sha384", "Size"
+            });
+
+            migrationBuilder.CreateIndex("IX_Files_Sha512_Size", "Files", new[]
+            {
+                "Sha512", "Size"
+            });
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex("IX_Files_Crc32_Size", "Files");
+
+            migrationBuilder.DropIndex("IX_Files_Md5_Size", "Files");
+
+            migrationBuilder.DropIndex("IX_Files_Sha1_Size", "Files");
+
+            migrationBuilder.DropIndex("IX_Files_Sha256_Size", "Files");
+
+            migrationBuilder.DropIndex("IX_Files_Sha384_Size", "Files");
+
+            migrationBuilder.DropIndex("IX_Files_Sha512_Size", "Files");
+        }
+    }
+}
\ No newline at end of file
diff --git a/RomRepoMgr.Database/Migrations/ContextModelSnapshot.cs b/RomRepoMgr.Database/Migrations/ContextModelSnapshot.cs
index 474f8c1..6ab506b 100644
--- a/RomRepoMgr.Database/Migrations/ContextModelSnapshot.cs
+++ b/RomRepoMgr.Database/Migrations/ContextModelSnapshot.cs
@@ -89,6 +89,18 @@ namespace RomRepoMgr.Database.Migrations
 
                 b.HasIndex("Size");
 
+                b.HasIndex("Crc32", "Size");
+
+                b.HasIndex("Md5", "Size");
+
+                b.HasIndex("Sha1", "Size");
+
+                b.HasIndex("Sha256", "Size");
+
+                b.HasIndex("Sha384", "Size");
+
+                b.HasIndex("Sha512", "Size");
+
                 b.ToTable("Files");
             });