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## com.sleepycat.je.util
Class DbDump

    java.lang.Object
      com.sleepycat.je.util.DbDump

Direct Known Subclasses:
  DbScavenger

    public class DbDump

extends Object

Dump the contents of a database. This utility may be used programmatically or from the command line.

     java com.sleepycat.je.util.DbDump
       -h <dir>           # environment home directory
      [-f <fileName>]     # output file, for non -rR dumps
      [-l]                # list databases in the environment
      [-p]                # output printable characters
      [-r]                # salvage mode
      [-R]                # aggressive salvage mode
      [-d] <directory>    # directory for *.dump files (salvage mode)
      [-s <databaseName>] # database to dump
      [-v]                # verbose in salvage mode
      [-V]                # print JE version number

See `main(java.lang.String[])` for a full description of the command line arguments. To dump a database to a stream from code:

        DbDump dump = new DbDump(env, databaseName, outputStream, boolean);
        dump.dump();

Because a `DATA=END` marker is used to terminate the dump of each database, multiple databases can be dumped and loaded using a single stream. The `dump()` method leaves the stream positioned after the last line written and the `DbLoad.load()` method leaves the stream positioned after the last line read.

Field Summary
`protected String` | `dbName`
`protected boolean` | `doAggressiveScavengerRun`
`protected boolean` | `doScavengerRun`
`protected Environment` | `env`
`protected File` | `envHome`
`protected boolean` | `formatUsingPrintable`
`protected String` | `outputDirectory`
`protected PrintStream` | `outputFile`
`protected boolean` | `verbose`

Constructor Summary
`DbDump(Environment env, String dbName, PrintStream outputFile, boolean formatUsingPrintable)` Create a DbDump object for a specific environment and database.
`DbDump(Environment env, String dbName, PrintStream outputFile, String outputDirectory, boolean formatUsingPrintable)` Deprecated. Please use the 4-arg ctor without outputDirectory instead.

Method Summary
`void` | `dump()` Perform the dump.
`protected void` | `dumpOne(PrintStream o, byte[] ba, boolean formatUsingPrintable)`
`static void` | `main(String[] argv)` The main used by the DbDump utility.
`protected void` | `openEnv(boolean doRecovery)`
`protected boolean` | `parseArgs(String[] argv)`
`protected void` | `printHeader(PrintStream o, boolean dupSort, boolean formatUsingPrintable)`
`protected void` | `printUsage(String msg)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### envHome

    protected File envHome

### env

    protected Environment env

### dbName

    protected String dbName

### formatUsingPrintable

    protected boolean formatUsingPrintable

### outputDirectory

    protected String outputDirectory

### outputFile

    protected PrintStream outputFile

### doScavengerRun

    protected boolean doScavengerRun

### doAggressiveScavengerRun

    protected boolean doAggressiveScavengerRun

### verbose

    protected boolean verbose

Constructor Detail

### DbDump

    public DbDump(Environment env,
                  String dbName,
                  PrintStream outputFile,
                  String outputDirectory,
                  boolean formatUsingPrintable)

  Deprecated. Please use the 4-arg ctor without outputDirectory instead.

### DbDump

    public DbDump(Environment env,
                  String dbName,
                  PrintStream outputFile,
                  boolean formatUsingPrintable)

  Create a DbDump object for a specific environment and database.

  Parameters:
    `env` - The Environment containing the database to dump.
    `dbName` - The name of the database to dump.
    `outputFile` - The output stream to dump the database to.
    `formatUsingPrintable` - true if the dump should use printable characters.

Method Detail

### main

    public static void main(String[] argv)
                     throws DatabaseException,
                            IOException

  The main used by the DbDump utility.

  Parameters:
    `argv` - The arguments accepted by the DbDump utility.

         usage: java { com.sleepycat.je.util.DbDump | -jar
         je-<version>.jar DbDump }
                     [-f output-file] [-l] [-p] [-V]
                     [-s database] -h dbEnvHome [-rR] [-v]
                     [-d directory]

    -f - the file to dump to.
    -l - list the databases in the environment.
    -p - If characters in either the key or data items are printing characters (as defined by isprint(3)), use printing characters in file to represent them. This option permits users to use standard text editors and tools to modify the contents of databases.
    -V - display the version of the JE library.
    -s database - the database to dump.
    -h dbEnvHome - the directory containing the database environment.
    -r - Salvage data from a possibly corrupt file. When used on a uncorrupted database, this option should return equivalent data to a normal dump, but most likely in a different order. The data for each database is saved into <databaseName>.dump files in the current directory.
    -d directory - the output directory for *.dump files (salvage mode)
    -R - Aggressively salvage data from a possibly corrupt file. The -R flag differs from the -r option in that it will return all possible data from the file at the risk of also returning already deleted or otherwise nonsensical items. Data dumped in this fashion will almost certainly have to be edited by hand or other means before the data is ready for reload into another database. The data for each database is saved into <databaseName>.dump files in the current directory.
    -v - print progress information to stdout for -r or -R mode.

  Throws:
    `DatabaseException` - if a failure occurs.
    `IOException`

### printUsage

    protected void printUsage(String msg)

### parseArgs

    protected boolean parseArgs(String[] argv)
                         throws IOException

  Throws:
    `IOException`

### openEnv

    protected void openEnv(boolean doRecovery)
                    throws DatabaseException

  Throws:
    `DatabaseException`

### dump

    public void dump()
              throws IOException,
                     DatabaseException

  Perform the dump.

  Throws:
    `DatabaseException` - if a failure occurs.
    `IOException`

### printHeader

    protected void printHeader(PrintStream o,
                               boolean dupSort,
                               boolean formatUsingPrintable)

### dumpOne

    protected void dumpOne(PrintStream o,
                           byte[] ba,
                           boolean formatUsingPrintable)

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