一些未认证的dbcc指令（慎用）
2006-06-13 23:09:56 来源：WEB开发网核心提示：下面这些dbcc command有些是没有官方支持的，不建议初学者使用，一些未认证的dbcc指令（慎用），切记小心使用，不过有很多还是非常有用
下面这些dbcc command有些是没有官方支持的，不建议初学者使用。切记小心使用，不过有很多还是非常有用，有兴趣的可以测试看看！
Unauthorized
of Sybase DBCC Commands
Use them at your own risk!
dbcc allocdump ( dbid, page )
Displays all extents on an allocation page.
Parameters
dbid database ID
page allocation page number
dbcc allocmap ( dbid, one_all, allocpg, bit_stat )
Display or modify status of allocation bitmaps used to detect full allocation
pages.
Parameters
ParamDescriptionValid Values
dbid database ID
one_all bitmap(s) to check/modify 0 entire allocation map
1 single allocation map
allocpg allocation page, if one_all = 1
bit_stat status of the bits 0 check the status
1 set the bit(s)
2 clear the bit(s)
dbcc bhash ( print, bucket_limit )
Check integrity of and optionally print the buffer hash table.
Parameters
ParamDescriptionValid Values
print print option print_bufs display all buffers (default)
no_print display only buffers with problems
bucket_limit number of buffers allowed in a bucket. default = 0
dbcc bufcount ( n_chains )
Print up to 10 longest buffer chains and average chain length.
Parameters
ParamDescriptionValid Values
n_chains the number of chains to print 1-10
dbcc buffer ( [ dbid ][, objid ][, nbufs ], printopt, buftype )
Prints buffer headers and pages from the buffer cache.
Parameters
ParamDescriptionValid Values
dbid (optional) database name or database ID 0 will show data for all
databases.
objid (optional) object ID 0 will show data for all objects.
nbufs (optional) number of buffers to examine. If positive, the nbufs
buffers which meet the other criteria (dbid, objid) are printed in MRU to
LRU order. If negative, the last nbufs buffers which meet the criteria are
printed in LRU to MRU order. If 0, all buffers will be printed in MRU to
LRU order.
printopt print option 0 print out only the buffer header and page header
(default)
1 print out each row separately and the offset table
2 print out each row as a whole and the offset table
buftype buffer type to print Can be numeric or a symbolic character
string. See table below for possible strings and their hexadecimal
equivalents
Buffer Types
ParamHexDescription
BUF_DIRTY 1 Buffer in cache differs from disk image.
BUF_IO 2 Buffer is being read or written.
BUF_PINNED 4 The log must be written before this buffer is.
BUF_KEPT 8 Some process is using this buffer.
BUF_RLOCK 10 The buffer is resource locked.
BUF_TRIP 20 The buffer ages out of cache more slowly.
BUF_NEW 40 Buffer contains a new page and has never been written.
BUF_RWAIT 80 The process is waiting for rlock.
BUF_IOERR 100 There was an error writing tis buffer.
BUF_SPECIAL 200 If this buffer is written, update relevant descriptors.
BUF_WQUEUE 400 This buffer is queued for an out-of-sequence database dump.
BUF_NOTHASHED 800 This buffer is not hashed.
BUF_HASHED 1000 This buffer is hashed.
BUF_DIAG 2000 This is a special buffer used for diagnostics only.
BUF_FILTHY 4000 The buffer was dirtied while in I/O (log only).
BUF_NORELEASE 8000 This is used for coordinating releases of rlocks on
allocation pages.
dbcc bytes ( startaddress, length )
Dump out bytes from specific address.
Parameters
ParamDescription
startaddress starting address to dump
length number of bytes to dump
dbcc cacheremove ( dbname, objectname )
Removes object from cache.
Parameters
ParamDescription
dbname database name
objname object name
dbcc capture_tds (spid)
Captures Tabular Data Stream into a file called $SYBASE/install/TDSDUMP. File
contains full stream, including passwords -- chmod the file to protect this
information.
dbcc checkalloc [( dbname [, option ] )]
Check data and index pages against corresponding extent structures (earlier
newalloc).
Parameters
ParamDescriptionValid Values
dbname (optional) database name
option (optional) fix option fix report and fix descrepancies
nofix report decrepancies only (default)
dbcc checkcatalog [( dbname)]
Check consistency of system catalogs tables for database named.
Parameters
ParamDescription
dbname (optional) database name; default is current db
dbcc checkdb [( dbname [, skip_ncindex ] )]
Check consistency of data and index pages.
Parameters
ParamDescription
dbname (optional) database name; default is current db
skip_ncindex (optional) skip check on non clustered indexes for the
database
dbcc checktable ( tabid [, skip_ncindex ] )
Check consistency of data and index pages.
Parameters
ParamDescription
tabid table name or table ID
skip_ncindex (optional) skip check on non clustered indexes for the table.
dbcc chgdbname ( dbname, newname )
Changes database name in DBINFO only.
Parameters
ParamDescription
dbname existing database name
newname new database name
dbcc chgobjname ( objname, newname )
Changes object name in cache only.
Parameters
ParamDescription
objname existing object name
newname new object name
dbcc cursorinfo ( cursor_level, cursor_name )
Displays cursor information.
Parameters
ParamDescription
cursor_level level number; -1 to get cursor info for all nesting levels
cursor_name name of the cursor
dbcc dbinfo [( dbname )]
Print DBINFO structure for specified database.
Parameters
ParamDescription
dbname (optional) database name
dbcc dbrecover ( dbname )
This will have recovery run on a suspect database without rebooting the server.
Parameters
ParamDescription
dbname database name
dbcc dbrepair ( db, option [, table][, index] )
Repair system tables.
Parameters
ParamDescriptionValid Values
db database ID or database name
option repair option dropdb drop the specified database
findstrandeddisplay stranded objects
fixindexrebuild the specified index; used on system catalogs only
fixsysindexcorrect pfreeoff value for sysindexes
newthresholdrebuild the database threshold table
remapupdate the in-core image of the database usage map table
repairindexrepair index for user tables
table (optional) table name
index (optional) index ID
dbcc dbtable ( dbid )
Print out the contents of the DBTABLE structure.
Parameters
ParamDescription
dbid database ID
dbcc delbuff ( dbid, page, dirty_flush, kept_flag, rlock_flag )
Remove buffer from cache, optionally flush to disk.
Parameters
ParamDescription
dbid database ID
page the logical page number of the page to be removed
dirty_flush if 1, then flush the page to disk if DIRTY
kept_flag if 1, then do not unkeep buffer if KEPT
rlock_flag if 1, then do not remove RESOURCE LOCK
dbcc delete_row ( dbid, page, delete_by_row, rownum )
Delete an index or data row by either a row number or an offset on a page.
Parameters
ParamDescriptionValid Values
dbid database ID
page the logical page number
delete_by_row delete location; by row or by offset 1 next parameter is
interpreted as row number
0 next parameter is interpreted as offset on the page
rownum either a row number or offset
dbcc des [( [ dbid ][, objid ] )]
Prints the contents of the specified DES (descriptor).
Parameters
ParamDescription
dbid (optional) database ID
objid (optional) object ID
dbcc descount ( n_chains )
Print up to 10 longest DES chains. P>Parameters
ParamDescription
n_chains the number of chains to print, up to 10.
dbcc desdiag ( dbid, option )
Produce DES diagnostic reports.
Parameters
ParamDescriptionValid Values
dbid database ID
optiondiagnostic to run -4 Display Hash Table Graph
-3 Display Diagnostic Maps
-2 Run all the tests (1-4)
-1 Return to caller - Exit
0 Redisplay this menu
1 Check Free Des Chain
2 Check Dbtable DES chain
3 Check Des Kept/Unkept chain
4 Check Des Name/Id hash table
5 Display 'lost' descriptors
6 Run tests (1-4), kepanic on errors
dbcc engine (engine, func)
Parameters
ParamDescription
engine engine number
func "online"
"offline"
dbcc extentchain ( dbid, objid, indexid, sort, display, [, order ] )
Displays or counts extents following the chain, checking chain integrity.
Parameters
ParamDescriptionValid Values
dbid database ID
objid object ID
indexid index ID
sort report on state of the sort bit 0 don't include this info
1 do report on sort bit status
display what to report 0 display the count only
1 display the extents
order (optional) order to follow the chain 0 descending
1 ascending
dbcc extentcheck ( dbid, objid, indexid, sort )
Examine all extents on allocation pages for specified object.
Parameters
ParamDescriptionValid Values
dbid database ID
objid object ID
indexid index ID
state of the sort bit0 don't report this
1 report sort bit status
dbcc extentdump ( dbid, page )
Display an extent.
Parameters
ParamDescription
dbid database ID
page the number of a page controlled by the extent in question
dbcc extentzap ( dbid, objid, indexid, sort )
Clear all extents matching the parameter values.
Parameters
ParamDescriptionValid Values
dbid database ID
objid object ID
indexid index ID
sortstate of the sort bit 0
1
dbcc findnotfullextents ( dbid, objid, indexid, sort )
Find all not full extents on all allocation pages for the specified object.
Parameters
ParamDescriptionValid Values
dbid database ID
objid object ID
indexid index ID
sortstate of the sort bit 0
1
dbcc fix_al [( dbname )]
Make allocation bitmaps match the page chains.
Parameters
ParamDescription
dbname (optional) database name
dbcc fix_text ( table )
To upgrade text values after converting the server to a multi-byte character
set.
Parameters
ParamDescription
table table name or table ID
dbcc gettrunc ()
Replication Server related: Prints current LTM (Log Transfer Manager)
information for the database.
dbcc help ( dbcc_command )
Give syntax on specific dbcc command.
Parameters
ParamDescription
dbcc_command the command for which syntax help is desired
dbcc ind ( dbid, objid, printopt )
Print each index page for a specified table.
Parameters
ParamDescriptionValid Values
dbid database ID
objid object ID
printopt print option 0 print out only the buffer header and page header
(default)
1 print page headers, page data in row format, and offset tables
2 print page headers, unformatted page data, and offset tables
dbcc indexalloc ( table, indid [, report][, fix] )
Parameters
ParamDescriptionValid Values
table table name or table ID
indid index ID
report (optional) report style full complete details
optimized essential details (default)
fast quick report
fix (optional) fix flag fix fix allocation errors on traversal (default)
nofix do not fix allocation errors
dbcc is_replication_enabled
Returns True/False via @@error value. Immediately after running this command,
select @@error. If @@error = 0, replication is enabled, else replication is not
enabled.
dbcc listoam ( db, objid, indid )
Lists object allocation information.
Parameters
ParamDescription
db database ID or database name
objid object ID
indid (optional) index ID
dbcc locateindexpgs ( dbid, objid, page, indexid, level )
Print all references in the index to the specified page.
Parameters
ParamDescription
dbid database ID
objid object ID
page logical page number of the page for which index references are being
searched
indexid index ID
level level within the index to search for references
dbcc lock
Print out lock chains.
dbcc lockunit ( file_name )
Parameters
ParamDescription
file_name file in $SYBASE/install
dbcc log ( [dbid][, objid][, pagenum][, rownum][, nrecords][, type], printopt )
Print log records.
Parameters
ParamDescriptionValid Values
dbid (optional) database ID
objid (optional) object ID
pagenum (optional) page number ORif given with no rownum
transaction ID if rownum is supplied
rownum (optional) transaction ID if given with pagenum
nrecords (optional) number of records to examine If positive, the first
nrecords log entries which meet the criteria (dbid, objid, pagenum,
rownum) are printed in forward order.
If negative, the last nrecords which meet the criteria are printed in
reverse order.
type (optional) type of record to print -1 Print all records
0 XREC_BEGINXACT
1 XREC_CHSYSIND
2 XREC_SWITCHTO
3 XREC_RETURN
4 XREC_INSERT
5XREC_DELETE
6 XREC_INSIND
7XREC_IINSERT
8 XREC_IDELETE
9 XREC_MODIFY
10XREC_NOOP
11 XREC_INOOP
12 XREC_DNOOP
13 XREC_ALLOC
14 XREC_DBNEXTID
15XREC_EXTENT Allocate extents without pages allocated.
16 XREC_SPLIT
17 XREC_CHECKPOINT
18 XREC_SAVEXACT
19 XREC_CMD
20 XREC_DEXTENT Deallocate extents.
21 XREC_DEALLOC Deallocate page.
22 XREC_DROPEXTS Delete all extents on an allocation page.
23 XREC_AEXTENTS Allocate extent and mark all pages used.
24 XREC_SALLOC Allocate for new page of a split.
25 XREC_PGCHGSYSIND Direct change to sysindexes.
27 XREC_SORT
28 XREC_SODEALLOC
29 XREC_ALTDB
30 XREC_ENDXACT
31 XREC_SORTTS
32 XREC_TEXT Direct inserts.
33 XREC_INOOPTEXT Deferred TEXT insert.
34 XREC_DNOOPTEXT Deferred TEXT delete.
35 XREC_ISINDTEXT Indirect insert.
36 XREC_TEXTDELETE Delete text
printopt print option 0 print out header information only (default)
1 print out header and data information.
dbcc logtransfer ('reserve', 'context')
dbcc logtransfer ('scan', {'normal'|'repeat'|'continue'})
Refer to your Rep Server manual.
dbcc memusage
Display detailed information on server's memory usage.
dbcc monitor ( task, group, option )
Allows a more detailed monitoring of the SQL Server. [Hint: Run dbcc
traceon(8399) first, to enable descriptive names for groups.]
Parameters
ParamValuePurpose
task"clear" clear earlier gathered statistics
"sample" gather fresh statistics
"select" enable statistics to be displayed
group "all" all groups' statistics are gathered/displayed
group_name name of the group for which statistics are to be
gathered/displayed
option "on" enable monitoring
"off" discontinue monitoring
dbcc netmemshow ([ option ])
Prints network memory allocations.
Parameters
ParamValuePurpose
option (optional) 1 summary information
2 or 3 all information (default)
dbcc netmemusage
Prints memory usage details.
dbcc newalloc ( dbname, option )
Reports on pages and extents in use.
Parameters
ParamDescription
dbname database name
option 1, 2, or 3
Caveat Emptor!!
Use them at your own risk!
dbcc page ( dbid, pagenum [, printopt ][, cache ][, logical ] )
Prints the contents of the specified page.
Parameters
ParamDescriptionValid Values
dbid database ID
pagenum the logical or virtual page number
printopt (optional) print option 0 print out only the buffer header and
page header (default)
1 print buffer headers, page header, each row separately and the offset
table
2 print out buffer and page headers, page as a whole and the offset table.
cache (optional) handling of pages in cache 0 print out the page as found
on disk
1 print out the page as found in cache if it resides in cache, otherwise
retrieve the page from disk and print (default).
logical (optional) type of page 0 pagenum is taken to a virtual page
number
1 pagenum is taken to be a logical page number (default)
dbcc pglinkage ( dbid, start, number, printopt, target, order )
Display the page chain, performing integrity checks during traversal.
Parameters
ParamDescriptionValid Values
dbid database ID
start page number with which to start
number number of pages to examine, or 0 if target is specified
printopt print option 0 display only the count of pages scanned
1 display information about the last 16 pages scanned
2 display all page numbers in the scan
target the particular page we are looking for, or 0 if number is specified
Specifying a target will continue to search in the specified direction
until the target page or the end of the chain is found.
ordertraversal order0 descending
1 ascending
dbcc pktmemshow ( [spid] )
Lists network buffers for active processes.
Parameters
ParamDescription
spid (optional) server process ID
dbcc procbuf ( [ dbid] [, objid] [, nbufs] [, printopt ] )
Print procedure buffer headers and proc-headers from the procedure cache.
Parameters
ParamDescriptionValid Values
dbid (optional) database ID
objid (optional) object ID
nbufs (optional) number of buffers to print
printopt (optional) print option 0 print out only the proc buff and proc
header (default)
1 print out proc buff, proc header and contents of buffer.
dbcc procdiag ( dbid, option )
Produce diagnostics on procedure buffers
Parameters
ParamDescriptionValid Values
dbid database ID
optiondiagnostic to run 0 display option menu
1 display diag bitmaps
2 display procbufs in cache
3 run summary diagnostics on entire cache
dbcc prtipage ( dbid, objid, indexid, indexpage )
Print the page number pointed to by each row on the specified index page.
Parameters
ParamDescription
dbid database ID
objid object ID
indexid index ID
indexpage the logical page number of the index page to dump
dbcc pss ( suid, spid, printopt )
Prints the contents of the specified PSS structure.
Parameters
ParamDescriptionValid Values
suid (optional) server user ID
spid (optional) server process ID
printopt print option 0 standard output
1 all open DES's and current sequence tree
2 print all locks held by the process to the errorlog.
dbcc rebuild_log ( dbname, rebuild, all )
Generates a new log containing a single checkpoint record.
Parameters
ParamDescriptionValid Values
dbname database name
rebuild rebuild log flag 0 do not create a new log
1 create a new log
all remove log flag 0 old preserved log removed
1 old preserved and new log removed
dbcc rebuildextents ( dbid, objid, indexid, sort, override )
Rebuild an object's extent chain.
Parameters
ParamDescriptionValid Values
dbid database ID
objid object ID
indexid index ID
sort state of the sort bit0 sorted
1not sorted
override override option 0 rebuild only if database is not open
1 rebuild even though database is already open
dbcc reindex ( tablename )
Rebuilds indexes.
Parameters
ParamDescription
tablename table whose indexes are to be rebuilt
dbcc remap ( objid, dbname, 1 )
Remaps a stored proc, trigger, rule, default, or view to be compatible with
release 10.0.
Parameters
ParamDescription
objid object ID
dbname database name
dbcc report_al [( dbname )]
Report on differences between allocation bitmaps and page chains.
Parameters
ParamDescription
dbname (optional) database name
dbcc resource
Print out the RESOURCE structure.
dbcc save_rebuild_log ( dbname )
Generate a new log containing a single checkpoint record and preserve old log
extents by changing the object ID.
Parameters
ParamDescription
dbname database name
dbcc setkeepalive (#minutes)
For use on Novell TCP/IP only.
dbcc setreplicate ( replicate_name, dbccbit )
Update the replication status of the object in cache only.
Parameters
ParamDescriptionValid Values
replicate_name object name
dbccbit new status 0 false
1 true
dbcc settrunc ( "ltm", option [, generation_num] )
Replication Server related: modifies LTM (Log Transfer Manager) information for
the database. "ltm" is entered as a literal string.
Options
OptionDescriptionValid Values
truncation option Should log be allowed to be truncated. Can be either:
"valid" set log truncation off -- The server cannot truncate tran log
records that have not been transferred to Rep Server yet.
"ignore" allow log to be truncated (via dump tran with no_log, etc.)
generation id option resets the database generation number to
generation_num. Used to increment number after a dump restore to prevent
Rep Server from rejecting transactions as duplicates "gen_id",
generation_num
dbcc show_bucket ( dbid, page, lookup_type )
Look for specified page in the buffer cache.
Parameters
ParamDescriptionValid Values
dbid database ID
page logical page number of page being looked for
lookup_type how to conduct search 1 use hash algorithm to look in the
bucket the page should be in
2 scan the entire buffer cache
dbcc showtext ( db, page )
Displays text or image data contained on a specified page.
Parameters
ParamDescription
db database name or database ID
page logical page number
dbcc tab ( dbid, objid, printopt )
Prints out the contents of each data page for the given table.
Parameters
ParamDescriptionValid Values
dbid database ID
objid object ID
printopt print option 0 print out only the page header (default)
1 print out each row separately and the offset table
2 print out the page as a whole and offset table
dbcc tablealloc ( tablename [, option][, mode] )
Check data and index pages against corresponding extent structures for a table.
Parameters
ParamDescriptionValid Values
tablename table name or table ID
option (optional) can take the following full fully check allocation
optimized check allocation pages listed in OAM (default)
fast exception report referenced but not allocated
null as optimized
mode (optional) can take the following fix fix errors on traversal
(default for user tables)
nofix do not fix errors (default for system tables)
dbcc thresholds ( db )
Provides thresholds information on the database.
Parameters
ParamDescription
db database name or database ID
dbcc traceoff ( tracenum [, tracenum ] ... )
Turn off specified trace flags.
Parameters
ParamDescription
tracenum number of the trace flag to turn off
dbcc traceon( tracenum [, tracenum ] ... )
Turn on specified trace flags.
Parameters
ParamDescription
tracenum number of the trace flag to turn on
Trace flags can be the following:
Trace Flags
NumberDescription
200 "Before" image of query tree
201 "After" image of query tree
260 To prevent "done_in_proc" messages
302 Information in index selection
310 Information in join selection
317 Complete information in join selection (voluminous)
320 Turn off join order heuristic
1204 Print out deadlock chains and victim
1205 Print out stack traces of deadlocked pids. Use in conjuction with
1204
2512 Bypass syslogs when doing checkalloc
1603 Use only standard unix calls for disk I/O
1610 Disable packet batching
3300 Display each log record as it is processed by recovery (voluminous)
3402 Do a alloc upgrade during loaddb recovery
3604 Send dbcc output to screen
3605 Send dbcc output to errorlog
3607 Do not recover any database, clear tempdb, or startup checkpoint
3608 Recover master only. Do not clear tempdb, or startup checkpoint
3609 Recover all databases. Do not clear tempdb, or startup checkpoint
3620 Do not kill infected processes
3701 Allows dropping and creating of system indexes (DANGEROUS!)
4000 Crash server at next loop for recovery testing
4012 Boot without starting up checkpoint process
4013 Place a record into errorlog each time someone logs in to the server
5101 Engine 0 will perform all disk and network I/O.
5102 Prevents engine 0 from running any non-affinitied tasks
8399 Enable descriptive names for groups (dbcc monitor)
dbcc tune ( "parameter", value [, tablename] )
Sets buildmaster parameters. Probably not necessary as of System11, where the
old buildmaster parameters are now incorporated into sysconfigures (see
documentation on sp_configure).
dbcc undo ( dbid, pgnum, rownum )
dbcc update_tmode ( procname, tranmode )
Update transaction-mode in both sysobjects and DES for stored procedures.
Parameters
ParamDescriptionValid Values
procname stored procedure name
tranmode transaction mode unchained
chained
anymode
dbcc usedextents ( dbid, devtype, display )
Count or display the status of used/unused extents on specified devices.
Parameters
ParamDescriptionValid Values
dbid database ID
devtype type of device to check all show all extents
log show extents of allocation for the log
nonlog show extents of nonlog allocations
display what to report on 0 information about the extents
1 count of the extents
中查找“一些未认证的dbcc指令（慎用）”更多相关内容
中查找“一些未认证的dbcc指令（慎用）”更多相关内容更多精彩
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