A. Degraded: The cluster is available, but the data is not redundantly backed up. DN master and slave have exited with only one exception, GTM has and only the highest available mode of the host, CNE has and only partially exited with exception

B. Normal: The cluster is available and the data is redundantly backed up. All processes are running and the master-backup relationship is normal

C. Unknow: The cluster status is unknown

D. Unavailable: The cluster is unavailable. Two or more DN master and slaves exit abnormally, GTM master and slave all exit abnormally, all CNs exit abnormally

A. xmax

B. data

C. xmin

D. cid

A. FALSE

B. TRUE

A. performance

B. verbose

C. analyze

D. costs

A. Isolation of computing and storage resources

B. When the database system load is high, resources exist between tasks

C. Some tasks have higher priorities, ensuring that higher priority tasks can obtain sufficient resources to complete the operation.

D. When multiple users use the database, achieve resource isolation

A. The storage space size of the tenant persistent data table space corresponds to an actual physical storage space size, which is specified by the parent tenant. The total storage used by all child tenants cannot exceed the total storage specified by the parent tenant

B. After "CPU Quota" is set. The system will allocate CPU execution time to the current tenant in proportion to the "CPU quota"

C. After the CPU quota parameter is set, the system will assign an exclusive number of CPU cores to the current tenant according to the "CPU quota" ratio. Other tenants can use it flexibly when the load is high

D. "CPU quota" and "CPU quota" can take effect at the same time

A. pg_xlog

B. System Log

C. Performance Log

D. pg_clog

A. Database user creation permissions

B. External server operation authority

C. Table, read-only appearance, write-only appearance, view operation permissions

D. Table space, database, schema operation permissions

A. Try to select fields that have a filter condition of col = 10001 in the query

B. Select the related conditions in the query as the columns

C. As distributed as possible

A. FALSE

B. TRUE

A. Vulnerability Scan

B. Database encryption

C. Data desensitization

A. Can balance IO and map different partitions to different disks

B. If one partition fails, other partition data is still available

C. Improve query performance

A. COPY

B. GDS

A. Redistribution phase allows performance statistics queries to be performed

B. insert mode (online) supports users to perform DROP, TRUNCATE-PARTITION operations on local tables

C. insert mode (online) does not support insert, delete, and update of local tables

D. Redistributed tables in read-only mode (offline) support updating, inserting, and deleting data