sys.pdw_nodes_pdw_physical_databases (Transact-SQL)
适用于:Analytics Platform System (PDW)
包含计算节点上每个物理数据库的行。 聚合物理数据库信息以获取有关数据库的详细信息。 若要合并信息,请sys.pdw_nodes_pdw_physical_databases
联接到sys.pdw_database_mappings
表。sys.databases
列名称 | 数据类型 | 描述 |
---|---|---|
database_id | int | 数据库的对象 ID。 请注意,此值与 sys.databases (Transact-SQL) 视图中的database_id不同。 |
physical_name | sysname | Shell/计算节点上数据库的物理名称。 此值与 sys.pdw_database_mappings (Transact-SQL) 视图中physical_name列中的值相同。 |
pdw_node_id | int | 与节点关联的唯一数值 ID。 |
示例:Analytics Platform System (PDW)
A. 返回
以下查询返回 master 中每个数据库的名称和 ID,以及每个计算节点上的相应数据库名称。
SELECT D.database_id AS DBID_in_master, D.name AS UserDatabaseName,
PD.pdw_node_id AS NodeID, DM.physical_name AS PhysDBName
FROM sys.databases AS D
JOIN sys.pdw_database_mappings AS DM
ON D.database_id = DM.database_id
JOIN sys.pdw_nodes_pdw_physical_databases AS PD
ON DM.physical_name = PD.physical_name
ORDER BY D.database_id, PD.pdw_node_ID;
B. 使用sys.pdw_nodes_pdw_physical_databases收集详细的对象信息
以下查询显示有关索引的信息,并包含有关对象属于数据库中对象的数据库的有用信息。
SELECT D.name AS UserDatabaseName, D.database_id AS DBIDinMaster,
DM.physical_name AS PhysDBName, PD.pdw_node_id AS NodeID,
IU.object_id, IU.index_id, IU.user_seeks, IU.user_scans, IU.user_lookups, IU.user_updates
FROM sys.databases AS D
JOIN sys.pdw_database_mappings AS DM
ON D.database_id = DM.database_id
JOIN sys.pdw_nodes_pdw_physical_databases AS PD
ON DM.physical_name = PD.physical_name
JOIN sys.dm_pdw_nodes_db_index_usage_stats AS IU
ON PD.database_id = IU.database_id
ORDER BY D.database_id, IU.object_id, IU.index_id, PD.pdw_node_ID;
°C 使用sys.pdw_nodes_pdw_physical_databases确定加密状态
以下查询提供 AdventureWorksPDW2012 数据库的加密状态。
WITH dek_encryption_state AS
(
SELECT ISNULL(db_map.database_id, dek.database_id) AS database_id, encryption_state
FROM sys.dm_pdw_nodes_database_encryption_keys AS dek
INNER JOIN sys.pdw_nodes_pdw_physical_databases AS node_db_map
ON dek.database_id = node_db_map.database_id AND dek.pdw_node_id = node_db_map.pdw_node_id
LEFT JOIN sys.pdw_database_mappings AS db_map
ON node_db_map .physical_name = db_map.physical_name
INNER JOIN sys.dm_pdw_nodes AS nodes
ON nodes.pdw_node_id = dek.pdw_node_id
WHERE dek.encryptor_thumbprint <> 0x
)
SELECT TOP 1 encryption_state
FROM dek_encryption_state
WHERE dek_encryption_state.database_id = DB_ID('AdventureWorksPDW2012 ')
ORDER BY (CASE encryption_state WHEN 3 THEN -1 ELSE encryption_state END) DESC;
另请参阅
Azure Synapse Analytics 和并行数据仓库目录视图
sys.databases (Transact-SQL)
sys.pdw_database_mappings (Transact-SQL)