Differences between the MDB, DRDB, FDB0, and FDB1 databases


DRDB: It is a dynamic database stored in the dynamic RAM and is powered by batteries.
MDB: It is a static database stored in the power-off RAM and is lost upon a power failure.
FDB0 and FDB1: They are permanent databases stored in FLASHROM.
In normal cases, NE configuration data is stored in both the MDB and DRDB databases.
Upon a restart from a power failure, data in the MDB database is lost. Therefore, the system control board first restores data from the DRDB database. If there is no data in the DRDB database (for example, the batteries are used up or fail), the system control board first restores data from the FDB0 and FDB1 databases.

Other related questions:
Function comparison of optical spectrum analyzer units MCA and WMU on OSN 6800
1. MCA boards are classified into MCA4 and MCA8, which provide four and eight ports respectively. An MCA board is mainly used to detect channel optical power, center wavelengths, optical signal-to-noise ratio (OSNR), and the number of wavelengths on an optical path. Similar to an optical spectrum analyzer, an MCA board reports the detected information to the system control board for fault diagnosis and monitoring. In addition, an MCA board can be used together with other boards to implement the automatic power equilibrium (APE) function. 2. The core function of a WMU board is to work with the system control board to lock wavelengths and monitor the wavelength offset of the transmit-end OTU board. The monitoring information is sent to the system control board by email. Then the system control board determines whether to adjust the wavelengths based on the wavelength configuration table. If wavelength adjustment is required, the system control board sends the adjustment information to the OTU board and then adjusts the wavelength offset. 3. An MCA board can monitor both the transmit end and receive end. 4. A WMU board can be configured only at the transmit end because it must work with the system control board at the local site to adjust the wavelength offset of the OTU board at the local site. 5. An MCA board mainly facilitates maintenance and a WMU board is used for function implementation. If an OTU board with 100 GHz channel spacing is used to implement a C-band 80-wavelength system, a WMU board needs to be configured to lock the operating wavelength of the OTU board. This is because the OTU board with 100 GHz channel spacing cannot satisfy the stability requirements of an 80-wavelength system, but the WMU board can help stabilize the wavelength performance.

Differences between IN_PWR_LOW differ from IN_PWR_ABN
IN_PWR_ABN is the predecessor of IN_PWR_LOW/IN_PWR_HIGH. Due to historical reasons, both alarms exist in the OptiX OSN 8800.

Differences between HBase and conventional databases
Advantages of HBase compared to conventional databases: 1. HBase uses the column-based storage mode. When multiple records are added, the data is stored by column. Conventional databases use the row-based storage mode. When multiple records are added, the data is read and stored by row. 2. HBase supports horizontal expansion, automatic splitting, and linear performance improvement. Conventional databases require manual configuration and are difficult to expand and maintain. 3. HBase performance remains unchanged when massive sets of data are concurrently read or written. In the same situation, conventional database performance drops dramatically. Conventional databases do, however, perform better in small-scale data read/write scenarios. 4. HBase data is stored in triplicate on HDFS, eliminating single points of failure and implementing cluster-level active/standby reliability. Conventional databases use active/standby mode to ensure reliability. 5. HBase supports dynamic expansion of columns while conventional databases do not. 6. CTBase in HBase supports correlation query and secondary indexing. Conventional databases only support basic conditional querying. 7. CTBase/Phoenix supports visual GUIs. Conventional databases use a visual query system. 8. HBase supports read/write permissions of tables and columns. Conventional databases only support basic rights control. 9. HBase is applicable to TB- and PB-level data, while conventional databases are not. Disadvantages of HBase compared to conventional databases: 10. HBase does not support simultaneous transaction authoring for multiple records. This means that data rollbacks need to be performed on related applications. Conventional databases support this function. 11. HBase only supports the character data type. Conventional databases support various data types.

Relationship between the Elk database and HD
Elk is an SQL on Hadoop solution. It is a component of HD and provides excellent SQL query performance and compatibility on HD.

Differences between TE40 and TE30 usage scenarios
Compared with TE30, TE40 has higher performance and more ports. TE40 is a good choice for holding video conferences in medium- or small-scale conference rooms and office rooms. Example: TE40 supports a maximum of 8 Mbit/s call bandwidth, while TE30 supports a maximum of 4 Mbit/s call bandwidth. TE40 supports a maximum of 1080p60 image resolution, while TE30 supports a maximum of 1080p30 image resolution. TE40 supports three video input ports, while TE30 supports two. TE30 adopts an all-in-one design that that integrates digital cameras and stereo microphones, satisfying the demand of senior managers to attend video conferences in administrative offices or small-sized conference rooms. For more differences, see TE40 Product Description and TE30 Product Description.

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