DBCC CHECKDB (Transact-SQL)
Applies to:
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Checks the logical and physical integrity of all the objects in the specified database by performing the following operations:
- Runs DBCC CHECKALLOC on the database.
- Runs DBCC CHECKTABLE on every table and view in the database.
- Runs DBCC CHECKCATALOG on the database.
- Validates the contents of every indexed view in the database.
- Validates link-level consistency between table metadata and file system directories and files when storing varbinary(max) data in the file system using FILESTREAM.
- Validates the Service Broker data in the database.
This means that the DBCC CHECKALLOC
, DBCC CHECKTABLE
, or DBCC CHECKCATALOG
commands don't have to be run separately from DBCC CHECKDB
. For more detailed information about the checks that these commands perform, see the descriptions of these commands.
DBCC CHECKDB
is supported on databases that contain memory-optimized tables but validation only occurs on disk-based tables. However, as part of database backup and recovery, a CHECKSUM validation is done for files in memory-optimized filegroups.
Since DBCC repair options aren't available for memory-optimized tables, you must back up your databases regularly and test the backups. If data integrity issues occur in a memory-optimized table, you must restore from the last known good backup.
Transact-SQL syntax conventions
Syntax
DBCC CHECKDB
[ ( database_name | database_id | 0
[ , NOINDEX
| , { REPAIR_ALLOW_DATA_LOSS | REPAIR_FAST | REPAIR_REBUILD } ]
) ]
[ WITH
{
[ ALL_ERRORMSGS ]
[ , EXTENDED_LOGICAL_CHECKS ]
[ , NO_INFOMSGS ]
[ , TABLOCK ]
[ , ESTIMATEONLY ]
[ , { PHYSICAL_ONLY | DATA_PURITY } ]
[ , MAXDOP = number_of_processors ]
}
]
]
Note
To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.
Arguments
database_name | database_id | 0
The name or ID of the database for which to run integrity checks. If not specified, or if 0 is specified, the current database is used. Database names must comply with the rules for identifiers.
NOINDEX
Specifies that intensive checks of nonclustered indexes for user tables won't be performed. This choice decreases the overall execution time. NOINDEX
doesn't affect system tables because integrity checks are always performed on system table indexes.
REPAIR_ALLOW_DATA_LOSS | REPAIR_FAST | REPAIR_REBUILD
Specifies that DBCC CHECKDB
repairs the errors found. Use the REPAIR options only as a last resort. The specified database must be in single-user mode to use one of the following repair options.
REPAIR_ALLOW_DATA_LOSS
Tries to repair all reported errors. These repairs can cause some data loss.
Warning
The
REPAIR_ALLOW_DATA_LOSS
option is a supported feature but it may not always be the best option for bringing a database to a physically consistent state. If successful, theREPAIR_ALLOW_DATA_LOSS
option may result in some data loss. In fact, it may result in more data lost than if a user were to restore the database from the last known good backup.Microsoft always recommends a user restore from the last known good backup as the primary method to recover from errors reported by
DBCC CHECKDB
. TheREPAIR_ALLOW_DATA_LOSS
option isn't an alternative for restoring from a known good backup. It is an emergency last resort option recommended for use only if restoring from a backup isn't possible.Certain errors, that can only be repaired using the
REPAIR_ALLOW_DATA_LOSS
option, may involve deallocating a row, page, or series of pages to clear the errors. Any deallocated data is no longer accessible or recoverable for the user, and the exact contents of the deallocated data cannot be determined. Therefore, referential integrity may not be accurate after any rows or pages are deallocated because foreign key constraints are not checked or maintained as part of this repair operation. The user must inspect the referential integrity of their database (usingDBCC CHECKCONSTRAINTS
) after using theREPAIR_ALLOW_DATA_LOSS
option.Before performing the repair, you must create physical copies of the files that belong to this database. This includes the primary data file (
.mdf
), any secondary data files (.ndf
), all transaction log files (.ldf
), and other containers that form the database including full text catalogs, file stream folders, memory optimized data, and so on.Before performing the repair, consider changing the state of the database to
EMERGENCY
mode and trying to extract as much information possible from the critical tables and save that data.REPAIR_FAST
Maintains syntax for backward compatibility only. No repair actions are performed.
REPAIR_REBUILD
Performs repairs that have no possibility of data loss. This option may include quick repairs, such as repairing missing rows in nonclustered indexes, and more time-consuming repairs, such as rebuilding an index.
This argument doesn't repair errors involving FILESTREAM data.
Important
Since DBCC CHECKDB
with any of the REPAIR options are completely logged and recoverable, Microsoft always recommends a user use DBCC CHECKDB
with any REPAIR options within a transaction (execute BEGIN TRANSACTION
before running the command) so that the user can confirm that they want to accept the results of the operation. Then the user can execute COMMIT TRANSACTION
to commit all work done by the repair operation. If the user does not want to accept the results of the operation, they can execute a ROLLBACK TRANSACTION
to undo the effects of the repair operations.
To repair errors, we recommend restoring from a backup. Repair operations do not consider any of the constraints that may exist on or between tables. If the specified table is involved in one or more constraints, we recommend running DBCC CHECKCONSTRAINTS
after a repair operation. If you must use REPAIR, run DBCC CHECKDB
without a repair option to find the repair level to use. If you use the REPAIR_ALLOW_DATA_LOSS
level, we recommend that you back up the database before you run DBCC CHECKDB
with this option.
ALL_ERRORMSGS
Displays all reported errors per object. All error messages are displayed by default. Specifying or omitting this option has no effect. Error messages are sorted by object ID, except for those messages generated from tempdb database.
EXTENDED_LOGICAL_CHECKS
If the compatibility level is 100, introduced in SQL Server 2008 (10.0.x), this option performs logical consistency checks on an indexed view, XML indexes, and spatial indexes, where present.
For more information, see Perform logical consistency checks on indexes later in this article.
NO_INFOMSGS
Suppresses all informational messages.
TABLOCK
Causes DBCC CHECKDB
to obtain locks instead of using an internal database snapshot. This includes a short-term exclusive (X) lock on the database. TABLOCK
will cause DBCC CHECKDB
to run faster on a database under heavy load, but will decrease the concurrency available on the database while DBCC CHECKDB
is running.
Important
TABLOCK
limits the checks that are performed; DBCC CHECKCATALOG
is not run on the database, and Service Broker data is not validated.
ESTIMATEONLY
Displays the estimated amount of tempdb
space that is required to run DBCC CHECKDB
with all the other specified options. The actual database check isn't performed.
PHYSICAL_ONLY
Limits the checking to the integrity of the physical structure of the page and record headers and the allocation consistency of the database. This check is designed to provide a small overhead check of the physical consistency of the database, but it can also detect torn pages, checksum failures, and common hardware failures that can compromise a user's data.
A full run of DBCC CHECKDB
may take considerably longer to complete than earlier versions. This behavior occurs because:
- The logical checks are more comprehensive.
- Some of the underlying structures to be checked are more complex.
- Many new checks have been introduced to include the new features.
Therefore, using the PHYSICAL_ONLY
option may cause a much shorter run-time for DBCC CHECKDB
on large databases and is recommended for frequent use on production systems. We still recommend that a full run of DBCC CHECKDB
be performed periodically. The frequency of these runs depends on factors specific to individual businesses and production environments.
This argument always implies NO_INFOMSGS
and isn't allowed with any one of the repair options.
Warning
Specifying PHYSICAL_ONLY
causes DBCC CHECKDB
to skip all checks of FILESTREAM data.
DATA_PURITY
Causes DBCC CHECKDB
to check the database for column values that aren't valid or out-of-range. For example, DBCC CHECKDB
detects columns with date and time values that are larger than or less than the acceptable range for the datetime data type; or decimal or approximate-numeric data type columns with scale or precision values that aren't valid.
Column-value integrity checks are enabled by default and don't require the DATA_PURITY
option. For databases upgraded from earlier versions of SQL Server, column-value checks aren't enabled by default until DBCC CHECKDB WITH DATA_PURITY
has been run error free on the database. After this, DBCC CHECKDB
checks column-value integrity by default. For more information about how CHECKDB
might be affected by upgrading database from earlier versions of SQL Server, see the Remarks section later in this article.
Warning
If PHYSICAL_ONLY
is specified, column-integrity checks are not performed.
Validation errors reported by this option can't be fixed by using DBCC repair options. For information about manually correcting these errors, see Knowledge Base article 923247: Troubleshooting DBCC error 2570 in SQL Server 2005 and later versions.
MAXDOP
Applies to: SQL Server 2014 (12.x) Service Pack 2 and later versions
Overrides the max degree of parallelism configuration option of sp_configure
for the statement. The MAXDOP
can exceed the value configured with sp_configure
. If MAXDOP
exceeds the value configured with Resource Governor, the SQL Server Database Engine uses the Resource Governor MAXDOP
value, described in ALTER WORKLOAD GROUP. All semantic rules used with the max degree of parallelism configuration option are applicable when you use the MAXDOP
query hint. For more information, see Configure the max degree of parallelism Server Configuration Option.
Warning
If MAXDOP
is set to zero then SQL Server chooses the max degree of parallelism to use.
Remarks
DBCC CHECKDB
doesn't examine disabled indexes. For more information about disabled indexes, see Disable Indexes and Constraints.
If a user-defined type is marked as being byte ordered, there must only be one serialization of the user-defined type. Not having a consistent serialization of byte-ordered user-defined types causes error 2537 when DBCC CHECKDB
is run. For more information, see User-Defined Type Requirements.
Because the Resource database is modifiable only in single-user mode, the DBCC CHECKDB
command can't be run on it directly. However, when DBCC CHECKDB
is executed against the master database, a second CHECKDB
is also run internally on the Resource database. This means that DBCC CHECKDB
can return extra results. The command returns extra result sets when no options are set, or when either the PHYSICAL_ONLY
or ESTIMATEONLY
option is set.
Starting with SQL Server 2005 (9.x) Service Pack 2, executing DBCC CHECKDB
no longer clears the plan cache for the instance of SQL Server. Before SQL Server 2005 (9.x) Service Pack 2, executing DBCC CHECKDB
clears the plan cache. Clearing the plan cache causes recompilation of all later execution plans and may cause a sudden, temporary decrease in query performance.
Perform logical consistency checks on indexes
Logical consistency checking on indexes varies according to the compatibility level of the database, as follows:
- If the compatibility level is at least 100 (introduced in SQL Server 2008 (10.0.x)):
- Unless
NOINDEX
is specified,DBCC CHECKDB
performs both physical and logical consistency checks on a single table and on all its nonclustered indexes. However, on XML indexes, spatial indexes, and indexed views only physical consistency checks are performed by default. - If
WITH EXTENDED_LOGICAL_CHECKS
is specified, logical checks are performed on an indexed view, XML indexes, and spatial indexes, where present. By default, physical consistency checks are performed before the logical consistency checks. IfNOINDEX
is also specified, only the logical checks are performed.
These logical consistency checks cross check the internal index table of the index object with the user table that it is referencing. To find outlying rows, an internal query is constructed to perform a full intersection of the internal and user tables. Running this query can have a significant effect on performance, and its progress can't be tracked. Therefore, we recommend that you specify WITH EXTENDED_LOGICAL_CHECKS
only if you suspect index issues that are unrelated to physical corruption, or if page-level checksums have been turned off and you suspect column-level hardware corruption.
- If the index is a filtered index,
DBCC CHECKDB
performs consistency checks to verify that the index entries satisfy the filter predicate. - If the compatibility level is 90 or less, unless
NOINDEX
is specified,DBCC CHECKDB
performs both physical and logical consistency checks on a single table or indexed view and on all its nonclustered and XML indexes. Spatial indexes aren't supported. - Starting with SQL Server 2016 (13.x), additional checks on persisted computed columns, UDT columns, and filtered indexes won't run by default to avoid the expensive expression evaluations. This change greatly reduces the duration of
CHECKDB
against databases containing these objects. However, the physical consistency check of these objects is always completed. Only whenEXTENDED_LOGICAL_CHECKS
option is specified, are the expression evaluations performed, in addition to the logical checks that are already present as part of theEXTENDED_LOGICAL_CHECKS
option (indexed view, XML indexes, and spatial indexes).
To learn the compatibility level of a database
Internal database snapshot
DBCC CHECKDB
uses an internal database snapshot for the transactional consistency needed to perform these checks. This prevents blocking and concurrency problems when these commands are executed. For more information, see View the Size of the Sparse File of a Database Snapshot (Transact-SQL) and the DBCC Internal Database Snapshot Usage section in DBCC (Transact-SQL). If a snapshot can't be created, or TABLOCK
is specified, DBCC CHECKDB
acquires locks to obtain the required consistency. In this case, an exclusive database lock is required to perform the allocation checks, and shared table locks are required to perform the table checks.
DBCC CHECKDB
fails when run against the master
database if an internal database snapshot can't be created.
Running DBCC CHECKDB
against tempdb
doesn't perform any allocation or catalog checks and must acquire shared table locks to perform table checks. This is because, for performance reasons, database snapshots aren't available on tempdb
. This means that the required transactional consistency can't be obtained.
How DBCC CHECKDB creates an internal snapshot database beginning with SQL Server 2014
DBCC CHECKDB
creates an internal snapshot database.The internal snapshot database is created by using physical files. For example, for a database with
database_id = 10
that has three filesE:\Data\my_DB.mdf
,E:\Data\my_DB.ndf
, andE:\Data\my_DB.ldf
, the internal snapshot database will be created usingE:\Data\my_DB.mdf_MSSQL_DBCC11
andE:\Data\my_DB.ndf_MSSQL_DBCC11
files. Thedatabase_id
of the snapshot isdatabase_id + 1
. Also note that the new files are created in the same folder using the naming convention<filename.extension>_MSSQL_DBCC<database_id_of_snapshot>
. No sparse file is created for the transaction log.The new files are marked as sparse files at the file system level. The Size on Disk used by the new files will increase based on how much data is updated in the source database during the
DBCC CHECKDB
command. The Size of the new files will be the same file as the.mdf
or.ndf
file.The new files are deleted at the end of
DBCC CHECKDB
processing. These sparse files that are created byDBCC CHECKDB
have the "Delete on Close" attributes set.
Warning
If the operating system encounters an unexpected shutdown while the DBCC CHECKDB
command is in progress, then these files will not be cleaned up. They will take up space, and can potentially cause failures on future DBCC CHECKDB
executions. In that case, you can delete these new files after you confirm that there is no DBCC CHECKDB
command currently being executed.
The new files are visible by using ordinary file utilities such as Windows Explorer.
Note
Prior to SQL Server 2014 (12.x), named file streams were used instead to create the internal snapshot files. The named file streams used the format <filename.extension>:MSSQL_DBCC<database_id_of_snapshot>. Named file streams are not visible by using ordinary file utilities such as Windows Explorer. Therefore, in SQL Server 2012 (11.x) and earlier versions, you may encounter error messages 7926 and 5030 when you run the DBCC CHECKDB
command for database files located on an ReFS-formatted volume. This is because file streams cannot be created on Resilient File System (RefS).
Check and repair FILESTREAM data
When FILESTREAM is enabled for a database and table, you can optionally store varbinary(max) binary large objects (BLOBs) in the file system. When using DBCC CHECKDB
on a database that stores BLOBs in the file system, DBCC checks link-level consistency between the file system and database.
For example, if a table contains a varbinary(max) column that uses the FILESTREAM attribute, DBCC CHECKDB
will check that there is a one-to-one mapping between file system directories and files and table rows, columns, and column values. DBCC CHECKDB
can repair corruption if you specify the REPAIR_ALLOW_DATA_LOSS
option. To repair FILESTREAM corruption, DBCC will delete any table rows that are missing file system data.
Best practices
We recommend that you use the PHYSICAL_ONLY
option for frequent use on production systems. Using PHYSICAL_ONLY
can greatly shorten run-time for DBCC CHECKDB
on large databases. We also recommend that you periodically run DBCC CHECKDB
with no options. How frequently you should perform these runs depends on individual businesses and their production environments.
On Azure SQL Managed Instance, the available storage space must accommodate the entire internal database snapshot file created by DBCC CHECKDB
, regardless of how much of it is actually used by data. This can lead to a situation where executing DBCC CHECKDB
on a very large but sparse database (the size of the data is much smaller than the database file size) fails due to lack of space on your SQL managed instance. If DBCC CHECKDB
consumes all available storage space during execution, you receive the following error message:
Msg 1133, Level 16, State 3, Line 1
The managed instance has reached its storage limit. To storage usage for the managed instance cannot exceed (...) MBs.
You might need to temporarily scale up your SQL managed instance storage capacity before running `DBCC CHECKDB` again.
Check objects in parallel
By default, DBCC CHECKDB
performs parallel checking of objects. The degree of parallelism is automatically determined by the query processor. The maximum degree of parallelism is configured just like parallel queries. To restrict the maximum number of processors available for DBCC checking, use sp_configure. For more information, see Configure the max degree of parallelism Server Configuration Option. Parallel checking can be disabled by using Trace Flag 2528. For more information, see Trace Flags (Transact-SQL).
Note
This feature is not available in every edition of SQL Server. For more information, see parallel consistency check in the RDBMS manageability section of Editions and supported features of SQL Server 2022.
Understand DBCC error messages
After the DBCC CHECKDB
command finishes, a message is written to the SQL Server error log. If the DBCC command successfully executes, the message indicates success and the amount of time that the command ran. If the DBCC command stops before completing the check because of an error, the message indicates that the command was terminated, a state value, and the amount of time the command ran. The following table lists and describes the state values that can be included in the message.
State | Description |
---|---|
0 | Error number 8930 was raised. This indicates a corruption in metadata that terminated the DBCC command. |
1 | Error number 8967 was raised. There was an internal DBCC error. |
2 | A failure occurred during emergency mode database repair. |
3 | This indicates a corruption in metadata that terminated the DBCC command. |
4 | An assert or access violation was detected. |
5 | An unknown error occurred that terminated the DBCC command. |
Note
SQL Server records the date and time when a consistency check was run for a database with no errors (or "clean" consistency check). This is known as the last known clean check
. When a database is first started, this date is written to the EventLog (EventID-17573) and error log in the following format:
CHECKDB for database '<database>' finished without errors on 2022-05-05 18:08:22.803 (local time). This is an informational message only; no user action is required.
Error reporting
A dump file (SQLDUMP<nnnn>.txt
) is created in the SQL Server LOG
directory whenever DBCC CHECKDB
detects a corruption error. When the Feature Usage data collection and Error Reporting features are enabled for the instance of SQL Server, the file is automatically forwarded to Microsoft. The collected data is used to improve SQL Server functionality.
The dump file contains the results of the DBCC CHECKDB
command and additional diagnostic output. Access is limited to the SQL Server service account and members of the sysadmin role. By default, the sysadmin role contains all members of the Windows BUILTIN\Administrators
group and the local administrator's group. The DBCC command doesn't fail if the data collection process fails.
Resolve errors
If any errors are reported by DBCC CHECKDB
, we recommend restoring the database from the database backup instead of running REPAIR with one of the REPAIR options. If no backup exists, running repair corrects the errors reported. The repair option to use is specified at the end of the list of reported errors. However, correcting the errors by using the REPAIR_ALLOW_DATA_LOSS
option might require deleting some pages, and therefore some data.
Under some circumstances, values might be entered into the database that aren't valid or out-of-range based on the data type of the column. DBCC CHECKDB
can detect column values that aren't valid for all column data types. Therefore, running DBCC CHECKDB
with the DATA_PURITY
option on databases that have been upgraded from earlier versions of SQL Server might reveal preexisting column-value errors. Because SQL Server can't automatically repair these errors, the column value must be manually updated. If CHECKDB
detects such an error, CHECKDB
returns a warning, the error number 2570, and information to identify the affected row and manually correct the error.
The repair can be performed under a user transaction to let the user roll back the changes that were made. If repairs are rolled back, the database will still contain errors and must be restored from a backup. After repairs are completed, back up the database.
Resolve errors in database emergency mode
When a database has been set to emergency mode by using the ALTER DATABASE statement, DBCC CHECKDB
can perform some special repairs on the database if the REPAIR_ALLOW_DATA_LOSS
option is specified. These repairs may allow for ordinarily unrecoverable databases to be brought back online in a physically consistent state. These repairs should be used as a last resort and only when you can't restore the database from a backup. When the database is set to emergency mode, the database is marked READ_ONLY, logging is disabled, and access is limited to members of the sysadmin fixed server role.
Note
You cannot run the DBCC CHECKDB
command in emergency mode inside a user transaction and roll back the transaction after execution.
When the database is in emergency mode and DBCC CHECKDB
with the REPAIR_ALLOW_DATA_LOSS
clause is run, the following actions are taken:
DBCC CHECKDB
uses pages that have been marked inaccessible because of I/O or checksum errors, as if the errors haven't occurred. Doing this increases the chances for data recovery from the database.DBCC CHECKDB
attempts to recover the database using regular log-based recovery techniques.- If database recovery is unsuccessful because of transaction log corruption, the transaction log is rebuilt. Rebuilding the transaction log may result in the loss of transactional consistency.
Warning
The REPAIR_ALLOW_DATA_LOSS
option is a supported feature of SQL Server. However, it may not always be the best option for bringing a database to a physically consistent state. If successful, the REPAIR_ALLOW_DATA_LOSS
option may result in some data loss.
In fact, it may result in more data lost than if a user were to restore the database from the last known good backup. Microsoft always recommends a user restore from the last known good backup as the primary method to recover from errors reported by DBCC CHECKDB
.
The REPAIR_ALLOW_DATA_LOSS
option is not an alternative for restoring from a known good backup. It is an emergency last resort option recommended for use only if restoring from a backup is not possible.
After rebuilding the log, there is no full ACID guarantee.
After rebuilding the log, DBCC CHECKDB
will be automatically performed and will both report and correct physical consistency issues.
Logical data consistency and business logic enforced constraints must be validated manually.
The transaction log size will be left to its default size and must be manually adjusted back to its recent size.
If the DBCC CHECKDB
command succeeds, the database is in a physically consistent state, and the database status is set to ONLINE. However, the database may contain one or more transactional inconsistencies. We recommend that you run DBCC CHECKCONSTRAINTS to identify any business logic flaws and immediately back up the database.
If the DBCC CHECKDB
command fails, the database can't be repaired.
Run DBCC CHECKDB with REPAIR_ALLOW_DATA_LOSS in replicated databases
Running the DBCC CHECKDB
command with the REPAIR_ALLOW_DATA_LOSS
option can affect user databases (publication and subscription databases) and the distribution database used by replication. Publication and subscription databases include published tables and replication metadata tables. Be aware of the following potential issues in these databases:
- Published tables. Actions performed by the
CHECKDB
process to repair corrupt user data might not be replicated: - Merge replication uses triggers to track changes to published tables. If rows are inserted, updated, or deleted by the
CHECKDB
process, triggers don't fire; therefore, the change isn't replicated. - Transactional replication uses the transaction log to track changes to published tables. The Log Reader Agent then moves these changes to the distribution database. Some DBCC repairs, although logged, can't be replicated by the Log Reader Agent. For example, if a data page is deallocated by the
CHECKDB
process, the Log Reader Agent doesn't translate this deallocation to a DELETE statement; therefore, the change isn't replicated. - Replication metadata tables. Actions performed by the
CHECKDB
process to repair corrupt replication metadata tables require removing and reconfiguring replication.
If you have to run the DBCC CHECKDB
command with the REPAIR_ALLOW_DATA_LOSS
option on a user database or distribution database:
- Quiesce the system: Stop activity on the database and at all other databases in the replication topology, and then try to synchronize all nodes. For more information, see Quiesce a Replication Topology (Replication Transact-SQL Programming).
- Execute
DBCC CHECKDB
. - If the
DBCC CHECKDB
report includes repairs for any tables in the distribution database or any replication metadata tables in a user database, remove and reconfigure replication. For more information, see Disable Publishing and Distribution. - If the
DBCC CHECKDB
report includes repairs for any replicated tables, perform data validation to determine whether there are differences between the data in the publication and subscription databases.
Result sets
DBCC CHECKDB
returns the following result set. The values might vary except when the ESTIMATEONLY
, PHYSICAL_ONLY
, or NO_INFOMSGS options are specified:
DBCC results for 'model'.
Service Broker Msg 9675, Level 10, State 1: Message Types analyzed: 13.
Service Broker Msg 9676, Level 10, State 1: Service Contracts analyzed: 5.
Service Broker Msg 9667, Level 10, State 1: Services analyzed: 3.
Service Broker Msg 9668, Level 10, State 1: Service Queues analyzed: 3.
Service Broker Msg 9669, Level 10, State 1: Conversation Endpoints analyzed: 0.
Service Broker Msg 9674, Level 10, State 1: Conversation Groups analyzed: 0.
Service Broker Msg 9670, Level 10, State 1: Remote Service Bindings analyzed: 0.
DBCC results for 'sys.sysrowsetcolumns'.
There are 630 rows in 7 pages for object 'sys.sysrowsetcolumns'.
DBCC results for 'sys.sysrowsets'.
There are 97 rows in 1 pages for object 'sys.sysrowsets'.
DBCC results for 'sysallocunits'.
There are 195 rows in 3 pages for object 'sysallocunits'.
There are 0 rows in 0 pages for object "sys.sysasymkeys".
DBCC results for 'sys.syssqlguides'.
There are 0 rows in 0 pages for object "sys.syssqlguides".
DBCC results for 'sys.queue_messages_1977058079'.
There are 0 rows in 0 pages for object "sys.queue_messages_1977058079".
DBCC results for 'sys.queue_messages_2009058193'.
There are 0 rows in 0 pages for object "sys.queue_messages_2009058193".
DBCC results for 'sys.queue_messages_2041058307'.
There are 0 rows in 0 pages for object "sys.queue_messages_2041058307".
CHECKDB found 0 allocation errors and 0 consistency errors in database 'model'.
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
DBCC CHECKDB
returns the following result set (message) when NO_INFOMSGS
is specified:
The command(s) completed successfully.
DBCC CHECKDB
returns the following result set when PHYSICAL_ONLY
is specified:
DBCC results for 'model'.
CHECKDB found 0 allocation errors and 0 consistency errors in database 'master'.
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
DBCC CHECKDB
returns the following result set when ESTIMATEONLY
is specified.
Estimated TEMPDB space needed for CHECKALLOC (KB)
-------------------------------------------------
13
(1 row(s) affected)
Estimated TEMPDB space needed for CHECKTABLES (KB)
--------------------------------------------------
57
(1 row(s) affected)
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Permissions
Requires membership in the sysadmin fixed server role or the db_owner fixed database role.
Examples
A. Check both the current and another database
The following example executes DBCC CHECKDB
for the current database and for the AdventureWorks2022
database.
-- Check the current database.
DBCC CHECKDB;
GO
-- Check the AdventureWorks2022 database without nonclustered indexes.
DBCC CHECKDB (AdventureWorks2022, NOINDEX);
GO
B. Check the current database, suppressing informational messages
The following example checks the current database and suppresses all informational messages.
DBCC CHECKDB WITH NO_INFOMSGS;
GO