A company uses the RDS for mysql service of HUAWEI CLOUD. As the amount of data increases, the disk of the RDS instance is found to be full. Which of the following methods can be used to solve it? (Multiple choice)

• A. You can delete useless historical table data to free up space.
• B. Expand the disk storage space size.
• C. Change the storage type to super high 10, and then expand the disk capacity.
• D. If the binlog log file occupies too much, you can contact a technician to clear the local binlog log to free up disk space.

After customers purchase basic cloud services such as HUAWEI CLOUD ECS and EVS, they deploy an open source MSQL database on ECS. When it is found that the SQL read and write of the database is slow.
Which of the following descriptions are correct about how users deal with referrals? (Multiple choice)

• A. The customer will check which MySQL table is slow to read and write and create a new index if the appropriate index is not established.
• B. In order to solve the problem as soon as possible, the customer does not need to analyze the problem and directly report the problem to Huawei engineers for solution.
• C. The customer database is slow to read and write. The preliminary analysis is that the hard disk is slow to read and write. If the hard disk fails to meet the promised performance indicators, report the failure to Huawei engineers for assistance.
• D. The customer database is slow to read and write. The initial analysis is that the network delay is large. If there is a bandwidth bottleneck within the bandwidth purchase range, report the failure to a Huawei engineer for assistance.

Which of the following descriptions about the source and destination networks of the DRS migration database are correct? (Multiple choice)

• A. When the source mySQL database and the target RDS cloud database are not in the same VPC, DRS automatically opens up the VPC network connection.
• B. When the databases of other public cloud platforms are migrated to HUAWEI CLOUD, they can be migrated by public IP interoperability.
• C. DRS can migrate both relational databases and non-relational databases such as MonoDB.
• D. When the local database is moved to the Huawei public cloud, it can be migrated by means of VPN interoperability.

An advertising design company has a large number of design documents stored on HUAWEI CLOUD 0BS, and the company's ECS instance (in the same area) also needs to access the documents in OBS.
As the public network access is affected by the network quality, it is decided to use the intranet domain name to access 0BS. Which of the following methods can tenants use to access the files in the 0BS bucket via the intranet domain name?

• A. The ECS instance accesses the 0BS bucket resources nearby through the accelerated method of CDN.
• B. ECS instances directly access the bucket resources through the 0Bs regional intranet IP.
• C. The ECS instance directly accesses the bucket resources by configuring the internal DNS domain name of 0BS.
• D. ECS instances directly access the bucket resources through the internal domain name of the 0Bs VPC.

When users implement the migration project, which of the following measures can reduce the risk of data inconsistency? (Multiple choice)

• A. Stop source-end business writing before migration to ensure that the migrated data is the full amount of data.
• B. After the migration is completed, check whether the destination and source data are consistent.
• C. Before the migration, the customer should make a backup of the source data.
• D. Full synchronization with multiple incremental synchronizations, the last synchronization needs to stop the source-side business writing.