You can see the error code indicating dbcc checkdb error messages. It turns out there are several steps you can take to fix this problem, which we’ll discuss now.
This resource explains how to troubleshoot known bugs using the
DBCC CHECKDB command.
When most of the
DBCC CHECKDB (or other similar statements such as
CHECKTABLE ) are executed, the following word should appear in the SQL Server error log:
date / time spid53 DBCC CHECKDB (mydb) executed by MYDOMAIN user encountered 15 errors and resolved dilemmas.Elapsed time: 0 hours minutes 1 0 seconds.separate internal snapshot out-point-LSN = 00000026: 0000089d: 0001 and base-LSN = 00000026: 0000089c: 0001. isThis is just a meaningful informational message. No user-friendly action is required.
This post shows how a large number of database consistency errors were found and how many were fixed (if a good fix was used for most commands). This message also appears in the Windows application event log as an informational message (ditto eventid = 8957, if any errors are reported to us, this message is a possibleinformation).
The message starting with “snapshot of the internal database …” will only be displayed visually if
DBCC CHECKDB was started in interactive mode, which is where the database is located, and not
SINGLE_USER. this is the mode. This is only because the internal database snapshot is used for interactive
DBCC To checkdb , which helps to present a consistent set of information and facts to check.
This article does not describe how to fix every error reported by
DBCC CHECKDB , but mainly describes a general approach to error reporting, no doubt about it. Any reference to
CHECKDB later in this article also refers to
CHECKFILEGROUP unless otherwise noted.
DBCC CHECKDB checks the physical and logical surface of database pages, rows, target and publication pages, index relationships, system table referential validity, and other structural checks. If only one of these checks fails (depending on the chosen Parameters), difficulties are reported as part of a specific team.
These complications can range from file system data corruption, underlying hardware issues, driver complaints, corrupted pages in memory, or SQL Server kernel issues. Read the sentence Investigate the cause to find out how the errors you find might occur.
The preferred solution when
DBCC CHECKDBreports texture and consistency errors is to restore from a known full backup. See Restore Restore for more information.
If recovering from escalation is not easy,
CHECKDBprovides automatic error correction functions. Although system-level problems, such as hardware or file system, almost always lead to data corruption, these problems should be either resolved before recovery or repaired. Restoring does not fix all consistency errors or corruption of the backup data.
DBCC A checkdbit is recommended that you define the minimum required recovery parameter to help resolve errors. These messages correspond to the following:
CHECKDB encountered 0 allocation problems and a consistency error 15 in the mydb index.
Repair_allow_data_loss is the minimum phase of fixing errors found by DBCC (mydb) checkdb.
A repair recommendation is the minimum repair that should be checked to correct any errors in
CHECKDB. Doesn’t this mean that almost all errors will be fixed before this repair option. In addition, not all reported complications require this level of fix. This means that, unfortunately, all error messages, not just
repair_allow_data_lossis recommended, practically result in data loss. A repair must be performed to determine if a particular decision in the conclusion of the failure will result in data loss. One method to help clarify the level of patching performed for each dessert is to use
DBCC CHECKTABLEto identify each table that reports errorsbke. This indicates the minimum level for the repair of this table.
Try helping yourself to script the database schema , run the script, create a modern database, and then use a tool like BCP or SSIS-Export / Import Wizard to export as much data as possible from the malicious database to a new database. Note that exporting based on a corrupted table is unlikely to work. In such cases, skip that dining table, move the next one, and save some money you can save.
Examine The Final Root Result For Database Consistency Errors
To find out why you are having problems with database consistency, consider the following methods:
- Check a Windows syslog event for system, driver, or disk-level errors.
- Verify the basic integrity of the file configuration with chkdsk der.
- Run any diagnostics provided to you by the manufacturer of the hardware that uses your computer and / or hard disk system.
- If you want to make sure that:
- Hardware and configuration meet I / O requirements for the Microsoft SQL Server Engine database .
- Updated device drivers and other supporting software components for all devices during I / O.
- Consider using a utility such as SQLIOSim on the same disk as the databases reporting consistency errors. SQLIOSim is a strategy independent of the SQL Server Engine for verifying the health of disk I / O operations. SQLIOSim does not work with SQL Server and definitely requires a separate download. Most likely, it will be in the MSSQL Binn folder.
- Check for other errors reported in SQL Server as an access violation or assertion. Actions against corrupted repositories, often detecting violations or generating errors in the results.
- Make sure your databases contain the
PAGE_VERIFY CHECKSUMparameter. If checksum errors are reported, this means that after that As SQL Server moved the written pages to disk, there were consistency dilemmas> Learn more about checksum errors.
- Look for error 832 in the ERROR LOG. Whether people indicate that pages can be evaluated in the cache before being written to disk. For more information, see Troubleshoot message 832 in SQL Server .
- On another system, watch out for restoring a database backup that is known to be “clean” (no
CHECKDBerrors) followed by a transaction symbol backup, timed out on error was met. If you can easily “repeat” this problem by restoring a “clean” database backup and backing up your logs, contact Microsoft Product Support Services for assistance.
- Data cleanliness errors can certainly be a problem when inserting or updating invalid data in SQL Server tables. For more information on troubleshooting data cleanliness errors, see Troubleshooting DBCC Errors 2570 in SQL Server 2005 .
For details on the
DBCC CHECKDB syntax or information / options for executing the command, see DBCC CHECKDB (Transact-SQL) . Any
CHECKDB encounters any errors, additional information such as the following is passed through the ERRORLOG for error reporting purposes:
Spid53 date and time using version 4.0.5 dbghelp.dll
Date / Time spid53 thread ** dump – spid =, EC = 0x00000000855F5EB0
Date / Time spid53 *** Stack dump sent to FilePath FileName
Date / Time spid53 * ******************************************* * *******************************
Date / Time spid53 *
Date / time spid53 (empty) START DRAINING BATTERY:
Spid53 date / time * spid 53 date / time
Date / Time spid53 *
Date and Time spid53 * DBCC database corruption
Spid53 Date / Time *
Date / time spid53 * eighty-four byte input buffer –
Date and time spid53 * dbcc checkdb (mydb)
Date / Time spid53 *
Date / Time spid53 ********************************************* ***** * *******************************
Date / Time spid53 * ——————————————— – – ———————————-
Datetime Spid53 – Short Stack Dump
Date / time package spid53 was signed as dump 0x00000000000001E8
dateand time spid53, return code from external registration process 0x20002001.
Commonly used error reporting files contain a SQLDump
To find out when the last precious
DBCC CHECKDB was started without detecting any database problems (remaining clean and usable
CHECKDB , check the SQL Server error log for a message such as the following for your database, or possibly the system database (this message is recorded as a Windows Application Event Log Information Level message with ID event = 17573):
Date / Time spid7s CHECKDB for information “Wizard” completed without errors at date / time 22: 11: 11.417 (local time). This is just a piece of information; no user action is required
- 6 minutes to read.
You should check the reference data after restoring
CHECKDB and completing The ability to export / import data. For more information, see DBCC arguments checkdb. Data may not be practical after a sequential restore. For example (especially
REPAIR_ALLOW_DATA_LOSS ) might delete entire pages of data. In such cases, the table in a canteen may have a foreign key relationship with another table on rows that do not have matching key rows in the Mom or Dad table.