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

@Deprecated
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 Exception

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:

EnvironmentFailureException - if an unexpected, internal or environment-wide failure occurs.

Exception

printUsage

protected void printUsage(String msg)

parseArgs

protected boolean parseArgs(String[] argv)
                     throws IOException

Throws:

IOException

openEnv

protected void openEnv(boolean doRecovery)
                throws EnvironmentNotFoundException,
                       EnvironmentLockedException

Throws:

EnvironmentNotFoundException

EnvironmentLockedException

dump

public void dump()
          throws EnvironmentNotFoundException,
                 EnvironmentLockedException,
                 DatabaseNotFoundException,
                 IOException

Perform the dump.

Throws:

EnvironmentFailureException - if an unexpected, internal or environment-wide failure occurs.

IOException - in subclasses.

EnvironmentNotFoundException

EnvironmentLockedException

DatabaseNotFoundException

printHeader

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

dumpOne

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