070-464J Latest Exam Braindumps
Question 11: Table1という名前のテーブルがあります。 Table1には100万行あります。Table1には、Column1という名前の列の列ストアインデックスがあります。
Table1にデータをインポートする必要があります。
このソリューションでは、データのインポートにかかる時間を最小限に抑える必要がありま
す。
あなたは何をするべきか？
答えるには、適切な行動を行動のリストから回答領域に移動し、正しい順序で並べます。
Correct Answer:
1 - Create a table named Table2 by using the same schema as Table1.
2 - Partition Table1.
3 - Import the data to Table2.
4 - Create a columnstore index on Table2 for Column1.
5 - Switch Table2 toTable1.
Explanation:
Note:
* An xVelocity memory optimized columnstore index, groups and stores data for each column
and then joins all the columns to complete the whole index.
Columnstore indexes can transform the data warehousing experience for users by enabling
faster performance for common data warehousing queries such as filtering, aggregating,
grouping, and star-join queries.
* Tables that have a columnstore index cannot be updated.
There are three ways to work around this problem.
A) To update a table with a columnstore index, drop the columnstore index, perform any
required INSERT, DELETE, UPDATE, or MERGE operations, and then rebuild the
columnstore index.
B) (applies in this scenario) Partition the table and switch partitions. For a bulk insert, insert
data into a staging table, build a columnstore index on the staging table, and then switch the
staging table into an empty partition. For other updates, switch a partition out of the main
table into a staging table, disable or drop the columnstore index on the staging table, perform
the update operations, rebuild or re-create the columnstore index on the staging table, and
then switch the staging table back into the main table.
C) Place static data into a main table with a columnstore index, and put new data and recent
data likely to change, into a separate table with the same schema that does not have a
columnstore index.
