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Oracle Interview Questions And Answers
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PROCESSES - To determine number of operating system processes that can be connected to ORACLE concurrently. The value should be 5 (background process) and additional 1 for each user. ROLLBACK_SEGMENTS - List of rollback segments an ORACLE instance acquires at database startup. Also optionally LICENSE_MAX_SESSIONS,LICENSE_SESSION_WARNING and LICENSE_MAX_USERS. 56. What is a trace file and how is it created ? Each server and background process can write an associated trace file. When an internal error is detected by a process or user process, it dumps information about the error to its trace. This can be used for tuning the database. 57. What are roles ? How can we implement roles ? Roles are the easiest way to grant and manage common privileges needed by different groups of database users. Creating roles and assigning provies to roles. Assign each role to group of users. This will simplify the job of assigning privileges to individual users. 58. What are the steps to switch a database's archiving mode between NO ARCHIVELOG and ARCHIVELOG mode ? 1. Shutdown the database instance. 2. Backup the databse 3. Perform any operating system specific steps (optional) 4. Start up a new instance and mount but do not open the databse. 5. Switch the databse's archiving mode. 59. How can you enable automatic archiving ? Shut the database Backup the database Modify/Include LOG_ARCHIVE_START_TRUE in init.ora file. Start up the databse. 60. How can we specify the Archived log file name format and destination ? By setting the following values in init.ora file. LOG_ARCHIVE_FORMAT = arch %S/s/T/tarc (%S - Log sequence number and is zero left paded, %s - Log sequence number not padded. %T - Thread number lef-zero-paded and %t - Thread number not padded). The file name created is arch 0001 are if %S is used. LOG_ARCHIVE_DEST = path. 61. What is the use of ANALYZE command ? To perform one of these function on an index,table, or cluster: |