多项选择题
Which two statements are true about InnoDB auto-increment locking?（）
A.The auto-increment lock can be a table-level lock
B.InnoDB never uses table-level locks
C.Some settings for innodb_autoinc_lock_mode can help reduce locking
D.InnoDB always protects auto-increment updates with a table-level lock
相关考题
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多项选择题
You are using replication and the binary log files on your master server consume a lot of disk space. Which two steps should you perform to safely remove some of the older binary log files?（）
A.Use the command PURGE BINARY LOGS and specify a binary log file name or a date and time to remove unused files
B.Execute the PURGE BINARY LOGE NOT USED command
C.Remove all of the binary log files that have a modification date earlier than today
D.Edit the .index file to remove the files you want to delete
E.Ensure that none of the attached slaves are using any of the binary logs you want to delete -
单项选择题
You have a login-path named "adamlocal" that was created by using the mysql_config_editor command. You need to check what is defined for this login_path to ensure that it is correct for you deployment. You execute this command: $mysql_config_editor print –login-path=adamlocal What is the expected output of this command?（）
A.The command prints all parameter for the login-path. The password is replaced with stars
B.The command prints the encrypted entry for the login-path. The is only possible to see if an entry exists
C.The command prints all parameters for the login-path. The password is shown only when you provide the –password option
D.The command prints all parameters for the login-path. The password is printed in plain tex -
单项选择题
A database exists as a read-intensive server that is operating with query_cachek_type =DEMAND. The database is refreshed periodically, but the resultset size of the queries does not fluctuate. Note the following details about this environment: A web application uses a limited set of queries. The Query Cache hit rate is high. All resultsets fit into the Query Cache. All queries are configured to use the Query Cache successfully. The response times for queries have recently started to increase. The cause for this has correctly been identified as the increase in the number of concurrent users accessing the web service. Based solely on the information provided, what is the most likely cause for this slowdown at the database level?（）
A.The Query Cache is pruning queries due to an increased number of requests
B.Query_cache_min_res_unit has been exceeded, leading to an increased performance overhead due to additional memory block lookups
C.Mutex contention on the Query Cache is forcing the queries to take longer due to its singlethreaded nature
D.The average resultset of a query is increasing due to an increase in the number of users requiring SQL statement execution
