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Added a scan tracker to speed up queries with high offset in very large database

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This commit is contained in:
emeric
2024-03-17 23:36:40 +01:00
parent fef4a90ce0
commit ed1be02aaf
9 changed files with 196 additions and 63 deletions
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src/libs/database/test/Track.cpp
+37 -9
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@@ -68,14 +68,20 @@ namespace lms::db::tests
ScopedTrack track1{ session, "MyTrackFile1" };
ScopedTrack track2{ session, "MyTrackFile1" };
ScopedTrack track3{ session, "MyTrackFile1" };
ScopedMediaLibrary library{ session };
ScopedMediaLibrary otherLibrary{ session };
{
auto transaction{ session.createWriteTransaction() };
track2.get().modify()->setMediaLibrary(library.get());
}
{
auto transaction{ session.createReadTransaction() };
bool moreResults;
TrackId lastRetrievedTrackId;
std::vector<Track::pointer> visitedTracks;
Track::find(session, lastRetrievedTrackId, 10, moreResults, [&](const Track::pointer& track)
Track::find(session, lastRetrievedTrackId, 10, [&](const Track::pointer& track)
{
visitedTracks.push_back(track);
});
@@ -83,40 +89,62 @@ namespace lms::db::tests
EXPECT_EQ(visitedTracks[0]->getId(), track1.getId());
EXPECT_EQ(visitedTracks[1]->getId(), track2.getId());
EXPECT_EQ(visitedTracks[2]->getId(), track3.getId());
EXPECT_FALSE(moreResults);
EXPECT_EQ(lastRetrievedTrackId, track3.getId());
}
{
auto transaction{ session.createReadTransaction() };
bool moreResults;
TrackId lastRetrievedTrackId{ track1.getId() };
std::vector<Track::pointer> visitedTracks;
Track::find(session, lastRetrievedTrackId, 1, moreResults, [&](const Track::pointer& track)
Track::find(session, lastRetrievedTrackId, 1, [&](const Track::pointer& track)
{
visitedTracks.push_back(track);
});
ASSERT_EQ(visitedTracks.size(), 1);
EXPECT_EQ(visitedTracks[0]->getId(), track2.getId());
EXPECT_TRUE(moreResults);
EXPECT_EQ(lastRetrievedTrackId, track2.getId());
}
{
auto transaction{ session.createReadTransaction() };
bool moreResults;
TrackId lastRetrievedTrackId{ track1.getId() };
std::vector<Track::pointer> visitedTracks;
Track::find(session, lastRetrievedTrackId, 0, moreResults, [&](const Track::pointer& track)
Track::find(session, lastRetrievedTrackId, 0, [&](const Track::pointer& track)
{
visitedTracks.push_back(track);
});
ASSERT_EQ(visitedTracks.size(), 0);
EXPECT_TRUE(moreResults);
EXPECT_EQ(lastRetrievedTrackId, track1.getId());
}
{
auto transaction{ session.createReadTransaction() };
TrackId lastRetrievedTrackId{};
std::vector<Track::pointer> visitedTracks;
Track::find(session, lastRetrievedTrackId, 10, [&](const Track::pointer& track)
{
visitedTracks.push_back(track);
}, otherLibrary.getId());
ASSERT_EQ(visitedTracks.size(), 0);
EXPECT_EQ(lastRetrievedTrackId, TrackId{});
}
{
auto transaction{ session.createReadTransaction() };
TrackId lastRetrievedTrackId{};
std::vector<Track::pointer> visitedTracks;
Track::find(session, lastRetrievedTrackId, 10, [&](const Track::pointer& track)
{
visitedTracks.push_back(track);
}, library.getId());
ASSERT_EQ(visitedTracks.size(), 1);
EXPECT_EQ(visitedTracks[0]->getId(), track2.getId());
EXPECT_EQ(lastRetrievedTrackId, track2.getId());
}
}
TEST_F(DatabaseFixture, Track_MediaLibrary)