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Many database set options can be configured for the current session by using SET Statements Transact-SQL and are often configured by applications when they connect. The database options described below are values that can be set for sessions that do not explicitly provide other set option values. Is the name of the database to be modified.
SQL Server The database is shut down cleanly and its resources are freed after the last user exits. The database automatically reopens when a user tries to use the database again.
The database remains open after the last user exits. They can be moved, copied to make backups, or even e-mailed to other users. To resolve this, execute a USE statement to open the database. Clearing the plan cache causes a recompilation of all subsequent execution plans and can cause a sudden, temporary decrease in query performance.
This message is logged every five minutes as long as the cache is flushed within that time interval. The query optimizer creates statistics on single columns in query predicates, as necessary, to improve query plans and query performance. These single-column statistics are created when the query optimizer compiles queries. The single-column statistics are created only on columns that are not already the first column of an existing statistics object. The default is ON. We recommend that you use the default setting for most databases.
The query optimizer does not create statistics on single columns in query predicates when it is compiling queries. Setting this option to OFF can cause suboptimal query plans and degraded query performance. The default value is OFF. The database files are candidates for periodic shrinking. Both data file and log files can be automatically shrunk. When set to OFF, the database files are not automatically shrunk during periodic checks for unused space.
The file is shrunk to a size where 25 percent of the file is unused space, or to the size of the file when it was created, whichever is larger. You cannot shrink a read-only database.
The database files are not automatically shrunk during periodic checks for unused space. Specifies that the query optimizer updates statistics when they are used by a query and when they might be out-of-date. Statistics become out-of-date after insert, update, delete, or merge operations change the data distribution in the table or indexed view. The query optimizer determines when statistics might be out-of-date by counting the number of data modifications since the last statistics update and comparing the number of modifications to a threshold.
The threshold is based on the number of rows in the table or indexed view. The query optimizer checks for out-of-date statistics before compiling a query and before executing a cached query plan. Before compiling a query, the query optimizer uses the columns, tables, and indexed views in the query predicate to determine which statistics might be out-of-date.
This option also applies to filtered statistics. Specifies that the query optimizer does not update statistics when they are used by a query and when they might be out-of-date. The query optimizer does not wait for statistics updates to complete before it compiles queries. The query optimizer waits for statistcs updates to complete before it compiles queries.
For more information that describes when to use synchronous or asynchronous statistics updates, see the section "Using the Database-Wide Statistics Options" in Statistics. The statement will fail if Query Store is not enabled or if it is not in Read-Write mode. However, these recommendations are not automatically applied. This is the default value. Controls change tracking options.
You can enable change tracking, set options, change options, and disable change tracking. For examples, see the Examples section later in this topic.
Change tracking information is automatically removed after the specified retention period. Change tracking data is not removed from the database. Specifies the minimum period for keeping change tracking information in the database. The default retention period is 2 days. The minimum retention period is 1 minute. The default retention type is DAYS. Disables change tracking for the database.
You must disable change tracking on all tables before you can disable change tracking off the database. Controls database containment options. The database is not a contained database. The database is a contained database. Setting database containment to partial will fail if the database has replication, change data capture, or change tracking enabled. Error checking stops after one failure. For more information about contained databases, see Contained Databases.
Any cursors open when a transaction is committed or rolled back are closed. The cursor name is valid only within this scope. The cursor can be referenced by local cursor variables in the batch, stored procedure, or trigger, or a stored procedure OUTPUT parameter. The cursor is implicitly deallocated when the batch, stored procedure, or trigger ends, unless it was passed back in an OUTPUT parameter. If the cursor is passed back in an OUTPUT parameter, the cursor is deallocated when the last variable that references it is deallocated or goes out of scope.
The cursor name can be referenced in any stored procedure or batch executed by the connection. The cursor is implicitly deallocated only at disconnect. Correlation statistics are not maintained. Afterwards, multiple connections are supported. Controls the database encryption state. When encryption is enabled at the database level all filegroups will be encrypted. Any new filegroups will inherit the encrypted property. You can see the encryption state of the database by using the sys. Controls the state of the database.
The database is closed, shut down cleanly, and marked offline. The database cannot be modified while it is offline.
The database is open and available for use. This could enable the system administrator read-only access to the database. Pour plus d'informations, consultez Database States. For more information, see Database States.
A database may be in the RESTORING state during an active restore operation or when a restore operation of a database or log file fails because of a corrupted backup file.
Controls whether updates are allowed on the database. Users can read data from the database but not modify it. For more information about statistics for a read-only database, see Statistics. The database is available for read and write operations. To change this state, you must have exclusive access to the database.
Controls user access to the database. Specifies that only one user at a time can access the database. At that point, a different user, but only one, can connect to the database. When set to ON, the background thread used to update statistics takes a connection against the database, and you will be unable to access the database in single-user mode.
If the option is set to ON, perform the following tasks: Recherchez les travaux des statistiques asynchrones actifs en interrogeant la vue de gestion dynamique sys. Check for active asynchronous statistics jobs by querying the sys. All users that have the appropriate permissions to connect to the database are allowed. Controls whether transactions commit fully durable or delayed durable. Any durability options set in an atomic block or commit statement are ignored. Controls whether the database can be accessed by external resources, such as objects from another database.
Database can be the source or target of a cross-database ownership chain. Database cannot participate in cross-database ownership chaining. When cross db ownership chaining is 1 ON , all user databases can participate in cross-database ownership chains, regardless of the value of this option.
Database modules for example, user-defined functions or stored procedures that use an impersonation context can access resources outside the database.
Database modules in an impersonation context cannot access resources outside the database. The value cannot be changed for the model and tempdb databases.