In which three scenarios can you use ADDM to get recommendations?
Examine the parameters set for your database instance:
You are asked by a developer to create a table for an application with these requirements:
Which attributes are the best for the tablespace in which this table should be created? (Choose the best answer.)
You are administering a database that supports an OLTP workload. RESULT_CACHE_MODE is set to the default value and a result cache is configured for the instance. Multiple sessions execute syntactically similar queries without dblinks, containing functions and expressions, on tables with no DML activity. Some users complain about poor performance of these queries.
You investigate and find that the queries are frequently performing physical I/O, even though the results fetched by the queries are similar.
Which two actions do you recommend to overcome the problem affecting these queries? (Choose two.)
Your database supports a DSS workload. In an application, a few complex queries that contain multiple functions and expressions are using materialized views. You notice that some queries are performing poorly because they are not benefiting from query rewrites.
Which three actions would you take to improve the performance of queries? (Choose three.)
You plan to upgrade your production database from Oracle Database 11g to 12c. As part of the upgrade, you want to introduce new indexes and materialized views. You have already created a test system with Oracle Database 12c, having the same structure and data as the production database, along with new schema objects to be added to the production database.
You want to identify regressed SQL statements, if any, which may have been caused by schema changes and the change in the optimizer version.
Which two methods would you use to achieve this? (Choose two.)
Which two statements are true about the interpretation of Buffer Cache Hit Ratio in the Instance Efficiency Percentages section of an AWR report? (Choose two.)
Your database supports an online transaction processing (OLTP) workload. The database uses ASM storage. One of the ASM disks goes offline because of hardware failure. When the disk is replaced and then added back to the diskgroup, database performance is affected by rebalance operations.
Which two actions would you recommend to lower the impact of rebalance operations on the performance of the database? (Choose two.)
Your database supports an OLTP system.
Examine the parameter values configured in your database:
sga_max_size = 480M
sga_target = 480M
pga_aggregate_target = 160M
The CUSTOMERS table contains 8,000 rows. The CUST_ID column is the primary key and the COUNTRY_ID column contains only three possible values: 1111, 2222, and 3333.
You execute the commands:
SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS('SH','CUSTOMERS');
PL/SQL procedure successfully completed.
SQL> CREATE INDEX COUNTRY_IDX ON CUSTOMERS (COUNTRY_ID);
You then perform a series of INSERT, UPDATE, and DELETE operations on the table.
View the Exhibit to examine the query and its execution plan.
Which two options can improve the performance of the query without significantly slowing down the DML operations? (Choose two.)
Examine the command to change a parameter value from the default to 50:
SQL> ALTER SYSTEM SET OPTIMIZER_INDEX_COST_ADJ = 50;
What is the effect of changing the value of the parameter? (Choose the best answer.)
Which two result in the least internal fragmentation within segments and the least external fragmentation within tablespaces? (Choose two.)