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NEW QUESTION: 1
The OPTIMIZER_USE_PLAN_BASELINES parameter is set to TRUE. The optimizer generates a plan for a SQL statement but does not find a matching plan in the SQL plan baseline.
Which two operations are performed by the optimizer in this scenario? (Choose two.)
A. The optimizer selects the new plan for the execution of the SQL statement.
B. The optimizer adds the new plan to the plan history.
C. The optimizer costs each of the accepted plans in the SQL plan baseline and picks the one with the lowest cost.
D. The optimizer adds the new plan to the SQL plan baseline as an accepted plan.
E. The optimizer adds the new plan to the SQL plan baseline but not in the ENABLED state.
Answer: B,C
Explanation:
Explanation/Reference:
Explanation:
15.2.2 Selecting SQL Plan Baselines
During the SQL plan baseline selection phase, Oracle Database detects plan changes based on the stored plan history, and selects plans to avoid potential performance regressions for a set of SQL statements.
Each time the database compiles a SQL statement, the optimizer does the following:
1
2
3
. Uses a cost-based search method to build a best-cost plan
. Tries to find a matching plan in the SQL plan baseline
. Does either of the following depending on whether a match is found:
If found, then the optimizer proceeds using the matched plan If not found, then the optimizer evaluates the cost of each accepted plan in the SQL plan baseline and selects the plan with the lowest cost The best-cost plan found by the optimizer that does not match any plans in the plan history for the SQL statement represents a new plan. The database adds this plan as a nonaccepted plan to the plan history.
The database does not use the new plan until it is verified to not cause a performance regression.
However, if a change in the system (such as a dropped index) causes all accepted plans to become non- reproducible, then the optimizer selects the best-cost plan. Thus, the presence of a SQL plan baseline causes the optimizer to use conservative plan selection strategy for the SQL statement.
To enable the use of SQL plan baselines, set the OPTIMIZER_USE_SQL_PLAN_BASELINES initialization parameter to TRUE (default).
A SQL plan baseline contains one or more accepted plans.
The plan history is the set of plans, both accepted and not accepted, that the optimizer generates for a SQL statement over time, the plans in the baseline form a subset of the plan history. For example, after the optimizer generates the first acceptable plan for a SQL plan baseline, subsequent plans are part of the plan history but not part of the plan baseline.

NEW QUESTION: 2

A. Option C
B. Option B
C. Option A
D. Option D
Answer: C

NEW QUESTION: 3
Microsoft Azure仮想マシン上にMicrosoft SQL Serverがあります。
現在のSQL Serverのインデックスではクエリの実行が遅くなると思われます。
クエリの実行時間を短縮するには、どのインデックスを作成する必要があるのかを特定する必要があります。
どの3つの動的管理ビューを使用しますか？それぞれの正しい答えは解決策の一部を表しています。
注：それぞれ正しい選択は1ポイントの価値があります。
A. sys.dm_db_index_physical_stats
B. sys.dm_db_index_operational_stats
C. sys.indexes
D. sys.dm_db_missing_index_details
E. sys.dm_db_missing_index_group_stats
F. sys.dm_db_index_usage_stats
G. sys.dm_db_missing_index_groups
H. sys.sysindexkeys
Answer: D,E,G
Explanation:
Explanation
The missing indexes feature consists of the following components:
A set of dynamic management objects that can be queried to return information about missing indexes.
The Missing Indexes element in XML Showplans, which correlate indexes that the query optimizer considers missing with the queries for which they are missing.
Dynamic Management Objects
After running a typical workload on SQL Server, you can retrieve information about missing indexes by querying the dynamic management objects listed in the following table. These dynamic management objects are stored in the master database.
sys.dm_db_missing_index_group_stats
Returns summary information about missing index groups, for example, the performance improvements that could be gained by implementing a specific group of missing indexes.
sys.dm_db_missing_index_groups
Returns information about a specific group of missing indexes, such as the group identifier and the identifiers ofall missing indexes that are contained in that group.
sys.dm_db_missing_index_details
Returns detailed information about a missing index; for example, it returns the name and identifier of the table where the index is missing, and the columns and column types that should make up the missing index.
sys.dm_db_missing_index_columns
Returns information about the database table columns that are missing an index.
References: https://technet.microsoft.com/en-us/library/ms345524(v=sql.105).aspx