path: root/src/third_party/wiredtiger/src/docs/command-line.dox

/*! @page command_line WiredTiger command line utility

WiredTiger includes a command line utility, \c wt.

@section util_global_synopsis SYNOPSIS
<code>wt [-BLRrVv] [-C config] [-E secretkey ] [-h directory] command [command-specific arguments]</code>

@section util_global_description DESCRIPTION
The \c wt tool is a command-line utility that provides access to
various pieces of the WiredTiger functionality.

@section util_global_options OPTIONS
There are several global options:

@par <code>-B</code>
Maintain release 3.3 log file compatibility.
@par <code>-C config</code>
Specify configuration strings for the ::wiredtiger_open function.
@par <code>-E secretkey</code>
Specify an encryption secret key for the ::wiredtiger_open function.
@par <code>-h directory</code>
Specify a database home directory.
@par <code>-L</code>
Forcibly turn off logging subsystem for debugging purposes.
@par <code>-m</code>
Verify the WiredTiger metadata as part of opening the database.
@par <code>-R</code>
Run recovery if the underlying database is configured to do so.
@par <code>-r</code>
Access the database via a readonly connection
@par <code>-V</code>
Display WiredTiger version and exit.
@par <code>-v</code>
Set verbose output.

Unless otherwise described by a \c wt command, the \c wt tool exits zero
on success and non-zero on error.

The \c wt tool supports several commands.  If configured in the underlying
database, some commands will run recovery when opening the database.  If
the user wants to force recovery on any command, use the \c -R option.
In general, commands that modify the database or tables will run recovery
by default and commands that only read data will not run recovery. It is
recommended when attempting to diagnose a corrupt database, that the -r
flag be used. This flag will open the connection read-only and prevent
utility commands from writing prevent utility commands from writing to
any of the existing database objects.

<hr>
@section util_alter wt alter
Alter a table.

@subsection util_alter_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] alter uri configuration ...</code>

The \c uri and \c configuration pairs may be specified to the
\c alter command.  These configuration pairs can be used to modify the
configuration values from those passed to the WT_SESSION::create
call.

The \c uri part of the configuration pair should match only one of the
objects being altered, but may be a prefix of the object being matched.
For example, the following two sets of configuration pairs are
equivalent in the case of altering a single table named \c xxx.

@code
table access_pattern_hint=sequential
table:xxx access_pattern_hint=sequential
@endcode

It's an error, however, to specify a matching prefix that matches more
than a single object being altered.

Multiple \c configuration arguments may be specified. For example, the
following two sets of configuration pairs are equivalent:

@code
table:xxx access_pattern_hint=random,cache_resident=false
table:xxx access_pattern_hint=random table:xxx cache_resident=false
@endcode

<hr>
@section util_backup wt backup
Perform a backup of a database or set of data sources.

The \c backup command performs a backup of the database, copying the
underlying files to a \c specified directory, which can be subsequently
opened as a WiredTiger database.  See @ref backup for more information,
and @ref file_permissions for specifics on the copied file permissions.

@subsection util_backup_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] backup [-t uri] directory</code>

@subsection util_backup_options Options
The following are command-specific options for the \c backup command:

@par <code>-t uri</code>
By default, the \c backup command does a backup of the entire database;
the \c -t option changes the \c backup command to do a backup of only
the named data sources.

<hr>
@section util_compact wt compact
Compact a table.

The \c compact command attempts to rewrite the specified table to
consume less disk space.

@subsection util_compact_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] compact uri</code>

@subsection util_compact_options Options
The \c compact command has no command-specific options.

<hr>
@section util_create wt create
Create a table.

The \c create command creates the specified \c uri with the specified
configuration.  It is equivalent to a call to WT_SESSION::create with
the specified string arguments.

@subsection util_create_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] create [-c config] uri</code>

@subsection util_create_options Options
The following are command-specific options for the \c create command:

@par <code>-c</code>
Include a configuration string to be passed to WT_SESSION::create.

<hr>
@section util_downgrade wt downgrade
Downgrade a database.

The \c downgrade command downgrades the database to the specified compatibility version.

@subsection util_downgrade_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] downgrade -V version</code>

@subsection util_downgrade_options Options
The following are command-specific options for the \c downgrade command:

@par <code>-V version</code>
The \c -V option is required, and specifies the version to which the database is downgraded.

<hr>
@section util_drop wt drop
Drop a table.

The \c drop command drops the specified \c uri.  It is equivalent to a
call to WT_SESSION::drop with the "force" configuration argument.

@subsection util_drop_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] drop uri</code>

@subsection util_drop_options Options
The \c drop command has no command-specific options.

<hr>
@section util_dump wt dump
Export data in a text format.

The \c dump command outputs the specified table in a portable format
which can be re-loaded into a new table using the \c load command.

See @subpage dump_formats for details of the dump file formats.

@subsection util_dump_synopsis Synopsis
<code>wt [-RrVv] [-C config] [-E secretkey ] [-h directory] dump [-jprx] [-c checkpoint] [-f output] [-t timestamp] uri</code>

@subsection util_dump_options Options
The following are command-specific options for the \c dump command:

@par <code>-c</code>
By default, the \c dump command opens the most recent version of the data
source; the \c -c option changes the \c dump command to dump as of the named
checkpoint.

@par <code>-f</code>
By default, the \c dump command output is written to the standard output;
the \c -f option re-directs the output to the specified file.

@par <code>-j</code>
Dump in JSON (<a href="http://www.json.org">JavaScript Object Notation</a>)
format.

@par <code>-p</code>
Dump in human-readable format (pretty-print). The \c -p flag is incompatible
with the \c load command. The \c -p flag can be combined with \c -x. In this case, raw data elements
will be formatted like \c -x with hexadecimal encoding.

@par <code>-r</code>
Dump in reverse order, from largest key to smallest.

@par <code>-t</code>
By default, the \c dump command opens the most recent version of the data
source; the \c -t option changes the \c dump command to dump as of the specified
timestamp.

@par <code>-x</code>
Dump all characters in a hexadecimal encoding (the default is to leave
printable characters unencoded). The \c -x flag can be combined with \c -p. In this case, the dump
will be formatted similar to \c -p except for raw data elements, which will look like \c -x with
hexadecimal encoding. If the two options are combined the output is no longer compatible
with \c load.

<hr>
@section util_list wt list
List the tables in the database.

By default, the \c list command prints out the tables stored in the
database.  If a URI is specified as an argument, only information about
that data source is printed.

@subsection util_list_synopsis Synopsis
<code>wt [-RrVv] [-C config] [-E secretkey ] [-h directory] list [-cv] [uri]</code>

@subsection util_list_options Options
The following are command-specific options for the \c list command:

@par <code>-c</code>
If the \c -c option is specified, the data source's checkpoints are printed
in a human-readable format.

@par <code>-v</code>
If the \c -v option is specified, the data source's complete schema table
value is printed.

<hr>
@section util_load wt load
Load a table from dump output.

The \c load command reads the standard input for data and loads it into
a table, creating the table if it does not yet exist.  The data should
be the format produced by the \c dump command; see @ref dump_formats for
details.

By default, if the table already exists, key/value pairs in the table
will be overwritten by new data with matching keys (use the \c -n option
to make an attempt to overwrite existing data return an error).  Existing
keys will not be removed.

@subsection util_load_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] load [-ajn] [-f input] [-r name] [uri configuration ...]</code>

@subsection util_load_options Options
The following are command-specific options for the \c load command:

@par <code>-a</code>
If the \c -a option is specified, record number keys in the input are
ignored and the data is appended to the data source and assigned new record
number keys.  The \c -a option is only applicable when loading into a
column store.

@par <code>-f</code>
By default, the \c load command reads from the standard input; the \c -f
option reads the input from the specified file.

@par <code>-j</code>
Load input in the JSON (<a href="http://www.json.org">JavaScript Object
Notation</a>) format that was created by the <code>dump -j</code> command.

@par <code>-n</code>
By default, input data will overwrite existing data where the key/value
pair already exists in the data source; the \c -n option causes the \c
load command to fail if there's an attempt to overwrite already existing
data.

@par <code>-r</code>
By default, the \c load command uses the table name taken from the
input; the \c -r option renames the data source.

Additionally, \c uri and \c configuration pairs may be specified to the
\c load command.  These configuration pairs can be used to modify the
configuration values from the dump header passed to the WT_SESSION::create
call.

The \c uri part of the configuration pair should match only one of the
objects being loaded, but may be a prefix of the object being matched.
For example, the following two sets of configuration pairs are
equivalent in the case of loading a single table named \c xxx.

@code
table block_allocation=first
table:xxx block_allocation=first
@endcode

It's an error, however, to specify a matching prefix that matches more
than a single object being loaded.

Multiple \c configuration arguments may be specified. For example, the
following two sets of configuration pairs are equivalent:

@code
table:xxx block_allocation=first,prefix_compress=false
table:xxx block_allocation=first table:xxx prefix_compress=false
@endcode

<hr>
@section util_loadtext wt loadtext
Load text into a table.

The \c loadtext command reads the standard input for text and loads it
into a table.  The input data should be printable characters, with
newline delimiters for each key or value.

The \c loadtext command does not create the object if it does not yet
exist.

In the case of inserting values into a column-store table, each value
is appended to the table; in the case of inserting values into a
row-store table, lines are handled in pairs, where the first line is the
key and the second line is the value.  If the row-store table already
exists, key/value pairs in the table will be overwritten by new data
with matching keys.  For either column-store or row-store tables, existing
keys will not be removed.

@subsection util_loadtext_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] loadtext [-f input] uri</code>

@subsection util_loadtext_options Options
The following are command-specific options for the \c loadtext command:

@par <code>-f</code>
By default, the \c loadtext command reads from the standard input; the
\c -f option reads the input from the specified file.

<hr>
@section util_printlog wt printlog
Display the database log. By default any operations in the log containing user
data are redacted.

The \c printlog command outputs the database log.

@subsection util_printlog_synopsis Synopsis
<code>wt [-RrVv] [-C config] [-E secretkey ] [-h directory] printlog [-mux] [-f output]</code>

@subsection util_printlog_options Options
The following are command-specific options for the \c printlog command:

@par <code>-f</code>
By default, the \c printlog command output is written to the standard
output; the \c -f option re-directs the output to the specified file.

@par <code>-m</code>
Print only message-type log records.

@par <code>-u</code>
Display user data.

@par <code>-x</code>
Keys and value items in the log are printed in hex format in addition
to the default string format.

<hr>
@section util_read wt read
Read records from a table.

The \c read command prints out the records associated with the specified
keys from the specified data source.  The data source must be configured
with string or record number keys and string values.

The \c read command exits non-zero if a specified record is not found.

@subsection util_read_synopsis Synopsis
<code>wt [-RrVv] [-C config] [-E secretkey ] [-h directory] read uri key ...</code>

@subsection util_read_options Options
The \c read command has no command-specific options.

<hr>
@section util_rename wt rename
Rename a table.

The \c rename command renames the specified table.

@subsection util_rename_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] rename uri name</code>

@subsection util_rename_options Options
The \c rename command has no command-specific options.

<hr>
@section util_salvage wt salvage
Recover data from a corrupted table.

The \c salvage command salvages the specified data source, discarding any
data that cannot be recovered.  Underlying files are re-written in place,
overwriting the original file contents.

@subsection util_salvage_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] salvage [-F] uri</code>

@subsection util_salvage_options Options
The following are command-specific options for the \c salvage command:

@par <code>-F</code>
By default, salvage will refuse to salvage tables that fail basic tests
(for example, tables that don't appear to be in a WiredTiger format).
The \c -F option forces the salvage of the table, regardless.

<hr>
@section util_stat wt stat
Display database or data source statistics.

The \c stat command outputs run-time statistics for the WiredTiger
engine, or, if specified, for the URI on the command-line.

@subsection util_stat_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] stat [-f] [uri]</code>

@subsection util_stat_options Options
The following are command-specific options for the \c stat command:

@par <code>-f</code>
Include only "fast" statistics in the output (equivalent to passing
<code>statistics=(fast)</code>) to WT_SESSION::open_cursor.

<hr>
@section util_truncate wt truncate
Truncate a table, removing all data.

The \c truncate command truncates the specified \c uri.  It is equivalent to a
call to WT_SESSION::truncate with no start or stop specified.

@subsection util_truncate_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] truncate uri</code>

@subsection util_truncate_options Options
The \c truncate command has no command-specific options.

<hr>
@section util_upgrade wt upgrade
Upgrade a table.

The \c upgrade command upgrades the specified table, exiting success if
the data source is up-to-date, and failure if the data source cannot be
upgraded.

@subsection util_upgrade_synopsis Synopsis
<code>wt [-RVv] [-C config] [-E secretkey ] [-h directory] upgrade uri</code>

@subsection util_upgrade_options Options
The \c upgrade command has no command-specific options.

<hr>
@section util_verify wt verify
Check the structural integrity of a table.

The \c verify command verifies the specified table, exiting success if
the data source is correct, and failure if the data source is corrupted.

@subsection util_verify_synopsis Synopsis
<code>wt [-RrVv] [-C config] [-E secretkey ] [-h directory] verify [-s] [-d dump_address | dump_blocks | dump_layout | dump_offsets=#,# | dump_pages ] [uri]</code>

@subsection util_verify_options Options
The following are command-specific options for the \c verify command:

<code>-d [config]</code>
This option allows you to specify values which you want to be displayed
when verification is run. See the WT_SESSION::verify configuration options.

<code>-s</code>
This option allows you to verify against the stable timestamp, valid only after a
rollback-to-stable operation. See the WT_SESSION::verify configuration options.

<hr>
@section util_write wt write
Write records to a table.

The \c write command stores records into the specified data source.
The data source must be configured with string or record number keys and
string values.

If the \c write command is called with the \c -a option, each
command-line argument is a single value to be appended to the specified
column-store data source.  If the \c write command is not called with
the \c -a option, the command-line arguments are key/value pairs.

Attempting to overwrite an already existing record will fail.

@subsection util_write_synopsis Synopsis
<code>
wt [-RVv] [-C config] [-E secretkey ] [-h directory] write -a uri value ...
<br>
wt [-RVv] [-C config] [-E secretkey ] [-h directory] write [-o] uri key value ...
</code>

@subsection util_write_options Options
The following are command-specific options for the \c write command:

@par <code>-a</code>
Append each value as a new record in the data source.

@par <code>-o</code>
By default, attempting to overwrite an already existing record will
fail.  The \c -o option changes \c write to overwrite previously
existing records.

*/