Sökning: "query optimizer"

Hittade 2 uppsatser innehållade orden query optimizer.

1. 1. GPS-Free UAV Geo-Localization Using a Reference 3D Database

   Master-uppsats, Linköpings universitet/Institutionen för systemteknik

   Författare :Justus Karlsson; [2022]
   Nyckelord :Deep Learning; Machine Learning; ML; AI; UAV; GPS-Free; CNN; 3D CNN; GCNN; 3D Database; geolocalization; geo-localization; georegistration; Hidden Markov Model; HMM; satellite; satellite database; Batch-Hard; triplet loss; PyTorch Geometric;

   Sammanfattning : The goal of this thesis has been global geolocalization using only visual input and a 3D database for reference. In recent years Convolutional Neural Networks (CNNs) have seen huge success in the task of classifying images. The flattened tensors at the final layers of a CNN can be viewed as vectors describing different input image features. LÄS MER

3. 2. Evaluating the effect of cardinality estimates on two state-of-the-art query optimizer's selection of access method

   Master-uppsats, KTH/Skolan för datavetenskap och kommunikation (CSC)

   Författare :Martin Barksten; [2016]
   Nyckelord :database; query optimizer; postgresql; mariadb; index selection;

   Sammanfattning : This master thesis concern relational databases and their query optimizer’s sensitivity to cardinality estimates and the e!ect the quality of the estimate has on the number of different access methods used for the same relation. Two databases are evaluated — PostgreSQL and MariaDB — on a real-world dataset to provide realistic results. LÄS MER