If a read/write database has a single log file that is currently unavailable, and if the database was shut down with no users or open transactions before theATTACHoperation,FOR ATTACHautomatically rebuilds the log file and updates the primary file. In contrast, for a read-only database, th...
When you set ALLOW_SNAPSHOT_ISOLATION to a new state (from ON to OFF, or from OFF to ON), ALTER DATABASE doesn't return control to the caller until all existing transactions in the database are committed. If the database is already in the state specified in the ALTER DATABASE statemen...
If a read/write database has a single log file that is currently unavailable, and if the database was shut down with no users or open transactions before the ATTACH operation, FOR ATTACH automatically rebuilds the log file and updates the primary file. In contrast, for a ...
在SQL Server 的早期版本中,AUTO_CLOSE 是一个同步进程,当与数据库引擎反复连接并不断中断连接的应用程序访问数据库时,将会导致性能下降。在 SQL Server 2005 中,AUTO_CLOSE 进程为异步进程;反复打开和关闭数据库不会降低性能。 可通过查看sys.databases目录视图中的is_auto_close_on列或 DATABASEPROPERTYEX 函数的I...
database_transaction_log_bytes_reserved_system int Applies to: SQL Server 2008 (10.0.x) and later. Number of bytes reserved for use in the database log for system transactions on behalf of the transaction. database_transaction_begin_lsn numeric(25,0) Applies to: SQL Server 2008 (10.0.x)...
In the SQL standards, each SQL query starts a transaction, unless one is already active. Such transactions must then be explicitly committed or rolled back. This isn’t always convenient for application developers. To alleviate this problem, most databases provide an autocommit mode. When autocommit...
若要从 Azure Synapse Analytics 或 Analytics 平台系统(PDW)调用此名称,请使用名称sys.dm_pdw_nodes_tran_active_snapshot_database_transactions。 Azure Synapse Analytics 中的无服务器 SQL 池不支持此语法。 语法 sys.dm_tran_active_snapshot_database_transactions ...
S’applique à: SQL Server 2014 (12.x) et versions ultérieures. Pour plus d’informations, consultezles optionsALTER DATABASE SET etla durabilitédes transactions de contrôle. <file_and_filegroup_options>::= Pour plus d’informations, voirOptions de fichiers et de groupes de fichiers d’...
ALTER CRYPTOGRAPHIC PROVIDER (Transact-SQL) ALTER DATABASE (Transact-SQL) ALTER DATABASE (Transact-SQL) ALTER DATABASE 文件和文件组选项 (Transact-SQL) ALTER DATABASE SET 选项 (Transact-SQL) ALTER DATABASE 数据库镜像 (Transact-SQL) ALTER DATABASE 兼容级别 (Transact-SQL) ...
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