What Is Rollup?

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Rollup is the process by which CES calculates the maximum, minimum, average, or variance values based on sample raw data collected in different periods and makes the result persistent. The calculation period is called a rollup period.


Rollup is a smooth calculation process. The longer the rollup interval, the more smoothly processing will be implemented, and the more accurate the generated data for trend prediction and statistics will be. The shorter the rollup interval is, the more accurate the generated data for alarm reporting will be.


The rollup period can be 5 minutes, 20 minutes, 1 hour, 4 hours, and 1 day.


The methods CES uses to process collected data vary depending on the data type:



  • If the data is an integer, the data will be rounded.

  • If the data is a decimal fraction, two decimal places will be retained. Any further decimal places will be rounded.


For example, the instance quantity in AS is an integer. If the rollup period is 5 minutes, the values of collected metric data are 1 and 4, then the average value is 2 instead of 2.5.


You can choose the CES mode based on the characteristics of the rollup to meet your service requirements.


Other related questions:
What is AS
Auto Scaling (AS) is a service that automatically adjusts resources based on your service requirements and configured AS policies. You can specify AS configurations and policies based on service requirements. These configurations and policies free you from repeatedly adjusting resources to keep up with service changes and demand peaks, which helps you reduce the required resources and workforce.

What is Beamforming
The beamforming or Transmit Beam Forming (TxBF) technology produces the strong directional radiation pattern based on the strong correlation of the spatial channel and wave interference principle, making the main lobe of the radiation pattern adaptive to point to the wave direction. This technology improves the SNR, system capacity, and coverage range. Beamforming or TxBF is an optional feature in the 802.11n standard. Beamforming includes explicit beamforming and implicit beamforming. Explicit beamforming requires the receive end to send information about the received signal to an AP. The AP then adjusts the transmit power to the optimal value according to the signal information. This function increases the SNR of the receive end and improves the receiving capability. Implicit beamforming allows an AP to automatically adjust the transmit power to increase the SNR of the receive end based on channel parameters without requiring the receive end to work with the AP. Currently, mainstream terminals do not support beamforming.

What is MIMO
Multiple input multiple output (MIMO) is an antenna system that consists of M transit antennas and N receive antennas. The MIMO technology allows spaces to become the resources used to improve performance and increases the coverage range of the wireless system. The MIMO system generates multiple spatial flows with each antenna generating a maximum of one spatial flow. The single in single out (SISO) system sends or receives one spatial flow (one copy of signals) at a time. The MIMO technology allows multiple antennas to send and receive multiple spatial flows (multiple copies of signals) simultaneously and to differentiate the signals sent to or received from different spaces. An 802.11n device supports up to 4x4 MIMO, a maximum of four spatial flows, with a rate of up to 600 Mbit/s.

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