This is the most common question for beginners or all of us. Database is living system, every second it has doing something. As a dba we need to check some informations to keep our db up and work 7×24 without any problems.
Here is the simple task lists
Daily Activity
- Oracle Database instance is running or not
- Database Listener is running or not.
- Check any session blocking the other session
- Check the alert log for an error
- Check is there any dbms jobs running & check the status of the same
- Check the Top session using more Physical I/O
- Check the number of log switch per hour
- How_much_redo_generated_per_hour.sql
- Run the statpack report
- Detect lock objects
- Check the SQL query consuming lot of resources.
- Check the usage of SGA
- Display database sessions using rollback segments (recomended not mandatory)
- State of all the DB Block Buffer (recomended not mandatory)
Weekly Activity
- Check the objects fragmented
- Check the Chaining & Migrated Rows
- Check the size of tables & check weather it need to partition or not
- Check for Block corruption
- Check the tables without PK (recomended not mandatory)
- Check the tables having no Indexes (recomended not mandatory)
- Check the tables having more Indexes (recomended not mandatory)
- Check the tables having FK but there is no Index (recomended not mandatory)
- Check the objects having the more extents
- Check the frequently pin objects & place them in separate tablespace & in cache Check the objects reload in memory many time
- Check the free space at O/s Level
- Check the CPU, Memory usage at O/s level define the threshold for the same.
- Check the used & free Block at object level as well as on tablespaces.
- Check the objects reaching to it’s Max extents
- Check free Space in the tablespace
- Check invalid objects of the database
- Check open cursor not reaching to the max limit (recomended not mandatory)
- Check locks not reaching to the max lock (recomended not mandatory)
Monthly Activity
- Check the database size & compare it previous size to find the exact growth of the database
- Check the Indexes which is not used yet
- Tablespace need coalescing or not
- Check the overall database statistics
- Trend Analysis of objects with tablespace, last analyzed, no. of Rows, Growth in days & growth