Network Time Protocol (NTP) Posted by MOHAMMED ABDUL HAMEED on 12:58 PM

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks.

The protocol is usually described in terms of a client-server model, but can as easily be used in peer-to-peer relationships where both peers consider the other to be a potential time source.

Clock synchronization :

A typical NTP client will regularly poll three or more servers on diverse networks. To synchronize its clock, the client must compute their time offset and round-trip delay. 

Round Trip Delay :

d=(T4-T1)-(T2-T3)

Time Offset :

t=(T2-T1)+(T3-T4)/2

Oracle Database 18c Posted by MOHAMMED ABDUL HAMEED on 9:49 AM

Larry Ellison introduced the first Autonomous Database Cloud with Oracle Database 18c at Oracle OpenWorld 2017, which runs on EXADATA infrastructure. The Oracle Autonomous Database Cloud uses ground-breaking machine learning to eliminate the human labor associated with tuning, patching, updating and maintaining the database and includes the following capabilities

1. Self-Driving: Provides continuous adaptive performance tuning based on machine learning. Automatically upgrades and patches itself while running. Automatically applies security updates while running to protect against cyber-attacks.

2. Self-Scaling: Instantly resizes compute and storage without downtime. Cost savings are multiplied because Oracle Autonomous Database Cloud consumes less compute and storage than Amazon, with lower manual administration costs.

3. Self-Repairing: Provides automated protection from downtime. SLA guarantees 99.995 percent reliability and availability, which reduces costly planned and unplanned downtime to less than 30-minutes per year.