Interview Questions on DB2

Repeatable Read provides highest data integrity as it holds page and lock the rows until a COMMIT point. In the context of DB2 or any relational database management system (RDBMS), the highest isolation level that provides the highest data integrity is typically considered to be “Serializable.” Isolation levels define the visibility of changes made by … Read more

Uncommitted read provides maximum concurrency. In DB2, the isolation level that provides maximum concurrency is “Read Committed.” This isolation level allows multiple transactions to access and modify the data simultaneously, and it ensures that each transaction sees a snapshot of the database at the beginning of the transaction. While Read Committed provides high concurrency, it … Read more

Concurrency is the process in which more than one application can access the similar data at same time. Concurrency in DB2 refers to the ability of multiple transactions to execute concurrently without interfering with each other. It involves managing access to shared resources, such as database tables, in a way that ensures data consistency and … Read more

DB2 optimizer is used to select the access paths and for processing SQL statements. In IBM DB2, the component responsible for processing SQL statements and selecting access paths is the “Query Compiler” or “SQL Compiler.” The Query Compiler is responsible for analyzing SQL statements and determining the most efficient way to retrieve or manipulate data, … Read more

The default page size of buffer pool is 4kb. BP0 BP1 BP2 BP32 In IBM Db2, the default page size of buffer pools is typically 4 KB (kilobytes). However, it’s essential to note that this can vary based on the version and configuration of Db2. It’s always a good practice to consult the specific documentation … Read more