Alibaba DBA (database administrator) pen question __ Database

Source: Internet
Author: User
The following topics can be selected according to their own situation to answer, do not have to answer all. You can also directly to the relevant questions to be responsible for interview personnel and not Shang ...
One: SQL tuning class

1: Enumerate several table connection ways
2: How to view SQL execution plan without the help of Third-party tools
3: How to use the difference between CBO,CBO and rule
4: How to locate the SQL that is important (consumes a lot of resources)
5: How to track the SQL of a session
What is the most concerned about 6:sql adjustment
7: Talk about your knowledge of indexes (structure of indexes, impact on DML, impact on queries, why query performance is improved)
8: Can you use the index query to improve the performance of the query?
9: What is the binding variable? What are the advantages and disadvantages of binding variables?
10: How to stabilize (fixed) the execution plan
11: How to adjust the memory related to the sort in 8i and 9i respectively, what is the function of the temporary tablespace?
12: Table T (a,b,c,d), to be sorted according to the field C after the 第21-30条 record display, please give the SQL
Two: Database basic concept Class

What does 1:pctused and pctfree mean?
2: A brief description of the relationship between Table/segment/extent/block
3: Describe the relationship between Tablespace and datafile
4: The local management of the table space and the characteristics of the Dictionary management table space, what is the characteristics of ASSM
5: What is the function of the rollback segment
6: What is the function of the log
7:sga mainly have those parts, what is the main role
What are the main functions of 8racle system process?
Three: Backup Recovery class

1: How to Categorize backups
2: What does archiving mean
3: If a table is 10:30:00 in 2004-08-04, how to restore it in the case of a perfect archive and backup
What are the 4:rman and what are the characteristics
Characteristics of 5:standby
6: How do you design a backup strategy for a system that requires a shorter recovery time (database 50G, daily archive 5G)
IV: System Management Class

1: For a system that exists system performance, say your diagnostic approach.
2: Several methods of diagnosing IO, CPU and performance status are listed
3: What do you know about Statspack?
4: If the system now needs to create an index on a large table, you will consider those factors and how to minimize the impact on the application
5: What do you know about RAID10 and RAID5?
Five: Comprehensive Casual class

1: What part of Oracle are you good at?
2: Do you like Oracle? Do you like the forum or what part of Oracle do you prefer?
3: Feel free to say what you think is the most interesting part of Oracle or the hardest part
4: Why choose to be a DBA?

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