The whole world population witnesses changes that are happening due to COVID-19 pandemic. One of the greatest changes is shown in the manner of conducting the educational process that has been transferred from traditional onsite to online. This paper analyses what are advantages and what are disadvantages of online teaching in higher education in Croatia, but it is applicable to all levels of education system. As approximately one year has passed since first lockdown and consequently closing all educational institutions, some experience is gained. This paper will try to systematize most of the findings that practice of online education has shown. In a few words, some advantages of quality online teaching are: low expenses, timesaving, learning at one’s own pace, motivation, communication, attention etc. Disadvantages of online teaching are: lack of social face-to-face contact, extreme exposure to screens, all sorts of distractions due to inappropriate work environment, inadequate technical equipment, lack of digital skills etc. Although the key role is on the teachers as creators of the educational process, students, as participants of the process, should also make an effort to adjust and embrace new ways of teaching and learning. Both teachers and students should express their opinions and all sorts of needs, to take the best out of online education during a pandemic.

The study aims to assess the impact of interactive and linear video on learning effectiveness of undergraduate informatics students with different predominant learning styles (visual, aural, read/write and kinesthetic style). The students in different treatment groups (learning with interactive vs. linear video) have achieved very good learning outcomes and those who used interactive videos achieved better learning outcomes. The impact of the kinesthetic predominant learning style on learning with interactive videos was not evident, i.e. the predominant learning style of the undergraduate informatics students did not affect their success, regardless of the type of video

Količina nastalih informacija svakim se danom povećava, a time rastu i zahtjevi za kapacitetomračunalnih resursa kojima se one obrađuju i analiziraju. Rastuću ulogu u obradi podataka imaračunarstvo u oblaku. Budući da se korištenje usluga u oblaku uobičajeno temelji na plaćanju popotrošnji, poznavanjem mogućnosti optimizacije i efikasnog korištenja resursa moguće je upravljatiželjenim performansama i troškovima. U ovom radu opisani su i prikazani na praktičnom primjerurazličiti postupci koji se mogu provesti u svrhu optimizacije podataka i SQL upita, a prilikom korištenjausluga u oblaku za rad s velikim podacima. Opisani postupci uključuju odabir formata i provedbukompresije podataka, ali i razne druge mogućnosti značajne za rad u oblaku, poput particioniranjapodataka i planiranja strukture SQL upita. U praktičnom dijelu rada, nad podacima različitih obilježjaproveden je niz SQL upita kako bi se usporedile performanse u odnosu na primijenjene postupke iobilježja upita. Temeljem navedenih postupaka i prikupljenih rezultata, može se zaključiti kako postojiveći broj mogućnosti putem kojih se može optimizirati provedba SQL upita. Važnost ovih postupakasastoji se u njihovom doprinosu učinkovitom i isplativom korištenju usluga u oblaku prilikom rada svelikim podacima.