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最新的 SnowPro Advanced Certification ARA-C01 免費考試真題 (Q107-Q112):
問題 #107
Which of the following are characteristics of how row access policies can be applied to external tables?
(Choose three.)
- A. A row access policy can be applied to the VALUE column of an existing external table.
- B. While cloning a database, both the row access policy and the external table will be cloned.
- C. A row access policy cannot be applied to a view created on top of an external table.
- D. An external table can be created with a row access policy, and the policy can be applied to the VALUE column.
- E. External tables are supported as mapping tables in a row access policy.
- F. A row access policy cannot be directly added to a virtual column of an external table.
答案:A,D,F
解題說明:
These three statements are true according to the Snowflake documentation and the web search results. A row access policy is a feature that allows filtering rows based on user-defined conditions. A row access policy can be applied to an external table, which is a table that reads data from external files in a stage. However, there are some limitations and considerations for using row access policies with external tables.
* An external table can be created with a row access policy by using the WITH ROW ACCESS POLICY clause in the CREATE EXTERNAL TABLE statement. The policy can be applied to the VALUE column, which is the column that contains the raw data from the external files in a VARIANT data type1.
* A row access policy can also be applied to the VALUE column of an existing external table by using the ALTER TABLE statement with the SET ROW ACCESS POLICY clause2.
* A row access policy cannot be directly added to a virtual column of an external table. A virtual column is a column that is derived from the VALUE column using an expression. To apply a row access policy to a virtual column, the policy must be applied to the VALUE column and the expression must be
* repeated in the policy definition3.
* External tables are not supported as mapping tables in a row access policy. A mapping table is a table that is used to determine the access rights of users or roles based on some criteria. Snowflake does not support using an external table as a mapping table because it may cause performance issues or errors4.
* While cloning a database, Snowflake clones the row access policy, but not the external table. Therefore, the policy in the cloned database refers to a table that is not present in the cloned database. To avoid this issue, the external table must be manually cloned or recreated in the cloned database4.
* A row access policy can be applied to a view created on top of an external table. The policy can be applied to the view itself or to the underlying external table. However, if the policy is applied to the view, the view must be a secure view, which is a view that hides the underlying data and the view definition from unauthorized users5.
References:
* CREATE EXTERNAL TABLE | Snowflake Documentation
* ALTER EXTERNAL TABLE | Snowflake Documentation
* Understanding Row Access Policies | Snowflake Documentation
* Snowflake Data Governance: Row Access Policy Overview
* Secure Views | Snowflake Documentation
問題 #108
A DevOps team has a requirement for recovery of staging tables used in a complex set of data pipelines. The staging tables are all located in the same staging schem a. One of the requirements is to have online recovery of data on a rolling 7-day basis.
After setting up the DATA_RETENTION_TIME_IN_DAYS at the database level, certain tables remain unrecoverable past 1 day.
What would cause this to occur? (Choose two.)
- A. The staging tables are of the TRANSIENT type.
- B. The tables exceed the 1 TB limit for data recovery.
- C. The DATA_RETENTION_TIME_IN_DAYS for the staging schema has been set to 1 day.
- D. The staging schema has not been setup for MANAGED ACCESS.
- E. The DevOps role should be granted ALLOW_RECOVERY privilege on the staging schema.
答案:A,C
問題 #109
What step will im the performance of queries executed against an external table?
- A. Partition the external table.
- B. Use an internal stage instead of an external stage to store the source files.
- C. Shorten the names of the source files.
- D. Convert the source files' character encoding to UTF-8.
答案:A
解題說明:
Partitioning an external table is a technique that improves the performance of queries executed against the table by reducing the amount of data scanned. Partitioning an external table involves creating one or more partition columns that define how the table is logically divided into subsets of data based on the values in those columns. The partition columns can be derived from the file metadata (such as file name, path, size, or modification time) or from the file content (such as a column value or a JSON attribute). Partitioning an external table allows the query optimizer to prune the files that do not match the query predicates, thus avoiding unnecessary data scanning and processing2 The other options are not effective steps for improving the performance of queries executed against an external table:
Shorten the names of the source files. This option does not have any impact on the query performance, as the file names are not used for query processing. The file names are only used for creating the external table and displaying the query results3 Convert the source files' character encoding to UTF-8. This option does not affect the query performance, as Snowflake supports various character encodings for external table files, such as UTF-8, UTF-16, UTF-32, ISO-8859-1, and Windows-1252. Snowflake automatically detects the character encoding of the files and converts them to UTF-8 internally for query processing4 Use an internal stage instead of an external stage to store the source files. This option is not applicable, as external tables can only reference files stored in external stages, such as Amazon S3, Google Cloud Storage, or Azure Blob Storage. Internal stages are used for loading data into internal tables, not external tables5 Reference:
1: SnowPro Advanced: Architect | Study Guide
2: Snowflake Documentation | Partitioning External Tables
3: Snowflake Documentation | Creating External Tables
4: Snowflake Documentation | Supported File Formats and Compression for Staged Data Files
5: Snowflake Documentation | Overview of Stages
6: SnowPro Advanced: Architect | Study Guide
7: Partitioning External Tables
8: Creating External Tables
9: Supported File Formats and Compression for Staged Data Files
10: Overview of Stages
問題 #110
What Snowflake features should be leveraged when modeling using Data Vault?
- A. Data needs to be pre-partitioned to obtain a superior data access performance
- B. Snowflake's ability to hash keys so that hash key joins can run faster than integer joins
- C. Scaling up the virtual warehouses will support parallel processing of new source loads
- D. Snowflake's support of multi-table inserts into the data model's Data Vault tables
答案:D
解題說明:
These two features are relevant for modeling using Data Vault on Snowflake. Data Vault is a data modeling approach that organizes data into hubs, links, and satellites. Data Vault is designed to enable high scalability, flexibility, and performance for data integration and analytics. Snowflake is a cloud data platform that supports various data modeling techniques, including Data Vault. Snowflake provides some features that can enhance the Data Vault modeling, such as:
Snowflake's support of multi-table inserts into the data model's Data Vault tables. Multi-table inserts (MTI) are a feature that allows inserting data from a single query into multiple tables in a single DML statement.
MTI can improve the performance and efficiency of loading data into Data Vault tables, especially for real- time or near-real-time data integration. MTI can also reduce the complexity and maintenance of the loading code, as well as the data duplication and latency12.
Scaling up the virtual warehouses will support parallel processing of new source loads. Virtual warehouses are a feature that allows provisioning compute resources on demand for data processing. Virtual warehouses can be scaled up or down by changing the size of the warehouse, which determines the number of servers in the warehouse. Scaling up the virtual warehouses can improve the performance and concurrency of processing new source loads into Data Vault tables, especially for large or complex data sets. Scaling up the virtual warehouses can also leverage the parallelism and distribution of Snowflake's architecture, which can optimize the data loading and querying34.
Snowflake Documentation: Multi-table Inserts
Snowflake Blog: Tips for Optimizing the Data Vault Architecture on Snowflake Snowflake Documentation: Virtual Warehouses Snowflake Blog: Building a Real-Time Data Vault in Snowflake
問題 #111
When loading data into a table that captures the load time in a column with a default value of either CURRENT_TIME () or CURRENT_TIMESTAMP () what will occur?
- A. All rows loaded using a specific COPY statement will have the same timestamp value.
- B. All rows loaded using a specific COPY statement will have varying timestamps based on when the rows were inserted.
- C. Any rows loaded using a specific COPY statement will have varying timestamps based on when the rows were read from the source.
- D. Any rows loaded using a specific COPY statement will have varying timestamps based on when the rows were created in the source.
答案:A
解題說明:
When using the COPY command to load data into Snowflake, if a column has a default value set to CURRENT_TIME() or CURRENT_TIMESTAMP(), all rows loaded by that specific COPY command will have the same timestamp. This is because the default value for the timestamp is evaluated at the start of the COPY operation, and that same value is applied to all rows loaded by that operation.
問題 #112
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