org.firebirdsql.management

## Class FBMaintenanceManager

- java.lang.Object
- - org.firebirdsql.management.FBServiceManager
  - - org.firebirdsql.management.FBMaintenanceManager

- All Implemented Interfaces:
    MaintenanceManager, ServiceManager

      public class FBMaintenanceManager
      extends FBServiceManager
      implements MaintenanceManager

  The `FBMaintenanceManager` class is responsible for replicating the functionality provided by the `gfix` command-line tool.

  Among the responsibilities of this class are:

  - Database shutdown
  - Extended database shutdown/online modes new with Firebird 2.5
  - Changing database mode to read-only or read-write
  - Enabling or disabling forced writes in the database
  - Changing the dialect of the database
  - Setting the cache size at database-level
  - Mending databases and making minor repairs
  - Sweeping databases
  - Activating and killing shadow files
  - Displaying, committing, or recovering limbo transactions
  Author:
    Gabriel Reid, Thomas Steinmaurer, Mark Rotteveel

- - ### Field Summary

    - ### Fields inherited from class org.firebirdsql.management.FBServiceManager

      `BUFFER_SIZE`

    - ### Fields inherited from interface org.firebirdsql.management.MaintenanceManager

      `ACCESS_MODE_READ_ONLY, ACCESS_MODE_READ_WRITE, OPERATION_MODE_FULL_SHUTDOWN, OPERATION_MODE_MULTI, OPERATION_MODE_NORMAL, OPERATION_MODE_SINGLE, PAGE_FILL_FULL, PAGE_FILL_RESERVE, SHUTDOWN_ATTACH, SHUTDOWN_FORCE, SHUTDOWN_TRANSACTIONAL, SHUTDOWNEX_ATTACHMENTS, SHUTDOWNEX_FORCE, SHUTDOWNEX_TRANSACTIONS, VALIDATE_FULL, VALIDATE_IGNORE_CHECKSUM, VALIDATE_READ_ONLY`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FBMaintenanceManager()` Create a new instance of `FBMaintenanceManager` based on the default GDSType.
    `FBMaintenanceManager(GDSType gdsType)` Create a new instance of `FBMaintenanceManager` based on a given GDSType.
    `FBMaintenanceManager(java.lang.String gdsType)` Create a new instance of `FBMaintenanceManager` based on a given GDSType.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `activateShadowFile()` Activate a database shadow file to be used as the actual database.
    `void` | `bringDatabaseOnline()` Bring a shutdown database online.
    `void` | `bringDatabaseOnline(byte operationMode)` Bring a shutdown database online with enhanced operation modes (FB 2.5 or higher).
    `void` | `commitTransaction(int transactionId)` Deprecated.
    `void` | `commitTransaction(long transactionId)` Commit a limbo transaction based on its ID.
    `long[]` | `getLimboTransactions()` Retrieve the ID of each limbo transaction as an array of longs.
    `void` | `killUnavailableShadows()` Remove references to unavailable shadow files.
    `java.util.List<java.lang.Long>` | `limboTransactionsAsList()` Retrieve the ID of each limbo transaction as a List of Long objects.
    `void` | `listLimboTransactions()` Deprecated.
    `void` | `markCorruptRecords()` Mark corrupt records in the database as unavailable.
    `void` | `rollbackTransaction(int transactionId)` Deprecated.
    `void` | `rollbackTransaction(long transactionId)` Rollback a limbo transaction based on its ID.
    `void` | `setDatabaseAccessMode(int mode)` Set the database to have read-write or read-only access.
    `void` | `setDatabaseDialect(int dialect)` Set the database's dialect.
    `void` | `setDefaultCacheBuffer(int pageCount)` Set the default page-buffer count to be cached in the database.
    `void` | `setForcedWrites(boolean forced)` Enable or disable forced (synchronous) writes in the database.
    `void` | `setPageFill(int pageFill)` Set the page fill strategy for when inserting records.
    `void` | `setSweepThreshold(int transactions)` Set the database automatic sweep interval to a given number of transactions.
    `void` | `shutdownDatabase(byte operationMode, int shutdownModeEx, int timeout)` Shutdown the current database with enhanced modes (FB 2.5 or higher).
    `void` | `shutdownDatabase(int shutdownMode, int timeout)` Shutdown the current database.
    `void` | `sweepDatabase()` Perform an immediate sweep of the database.
    `void` | `validateDatabase()` Locate and release database pages that are allocated but unassigned to any data structures.
    `void` | `validateDatabase(int options)` Locate and release database pages that are allocated but unassigned to any data structures.

    - ### Methods inherited from class org.firebirdsql.management.FBServiceManager

      `attachDatabase, attachServiceManager, createRequestBuffer, executeServicesOperation, executeServicesOperation, getCharSet, getDatabase, getDbCryptConfig, getHost, getLogger, getPassword, getPort, getServerVersion, getServiceName, getUser, getWireCrypt, queueService, setCharSet, setDatabase, setDbCryptConfig, setHost, setLogger, setPassword, setPort, setUser, setWireCrypt`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.firebirdsql.management.ServiceManager

      `getCharSet, getDatabase, getDbCryptConfig, getHost, getLogger, getPassword, getPort, getServerVersion, getUser, getWireCrypt, setCharSet, setDatabase, setDbCryptConfig, setHost, setLogger, setPassword, setPort, setUser, setWireCrypt`

- - ### Constructor Detail

    - #### FBMaintenanceManager

          public FBMaintenanceManager()

      Create a new instance of `FBMaintenanceManager` based on the default GDSType.

    - #### FBMaintenanceManager

          public FBMaintenanceManager(java.lang.String gdsType)

      Create a new instance of `FBMaintenanceManager` based on a given GDSType.
      Parameters:
        `gdsType` - type must be PURE_JAVA, EMBEDDED, or NATIVE

    - #### FBMaintenanceManager

          public FBMaintenanceManager(GDSType gdsType)

      Create a new instance of `FBMaintenanceManager` based on a given GDSType.
      Parameters:
        `gdsType` - The GDS implementation type to use

  - ### Method Detail

    - #### setDatabaseAccessMode

          public void setDatabaseAccessMode(int mode)
                                     throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Set the database to have read-write or read-only access.
      Specified by:
        `setDatabaseAccessMode` in interface `MaintenanceManager`
      Parameters:
        `mode` - Must be either `ACCESS_MODE_READ_WRITE` or `ACCESS_MODE_READ_ONLY`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### setDatabaseDialect

          public void setDatabaseDialect(int dialect)
                                  throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Set the database's dialect.
      Specified by:
        `setDatabaseDialect` in interface `MaintenanceManager`
      Parameters:
        `dialect` - The database dialect, must be either 1 or 3
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### setDefaultCacheBuffer

          public void setDefaultCacheBuffer(int pageCount)
                                     throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Set the default page-buffer count to be cached in the database.
      Specified by:
        `setDefaultCacheBuffer` in interface `MaintenanceManager`
      Parameters:
        `pageCount` - The number of pages to be cached, must be a positive
      Throws:
        `java.sql.SQLException` - If the given page count cannot be set, or a database access error occurs

    - #### setForcedWrites

          public void setForcedWrites(boolean forced)
                               throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Enable or disable forced (synchronous) writes in the database.

      Note, it is considered to be a very bad idea to disable forced writes on Windows platforms.

      Specified by:
        `setForcedWrites` in interface `MaintenanceManager`
      Parameters:
        `forced` - If `true`, forced writes will be used in the database, otherwise buffered writes will be used.
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### setPageFill

          public void setPageFill(int pageFill)
                           throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Set the page fill strategy for when inserting records.

      `pageFill` can be one of:

      - `PAGE_FILL_FULL` Fully fill database pages
      - `PAGE_FILL_RESERVE` Reserve 20% of page space for later record deltas
      Specified by:
        `setPageFill` in interface `MaintenanceManager`
      Parameters:
        `pageFill` - The page-filling strategy, either `PAGE_FILL_FULL` or `PAGE_FILL_RESERVE`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### shutdownDatabase

          public void shutdownDatabase(int shutdownMode,
                              int timeout)
                                throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Shutdown the current database.

      Shutdown can be done in three modes:

      - `SHUTDOWN_ATTACH` - No new non-owner connections will be allowed to the database during the shutdown, and shutdown is cancelled if there are still processes connected at the end of the timeout.
      - `SHUTDOWN_TRANSACTIONAL` - No new transactions can be started during the timeout period, and shutdown is cancelled if there are still active transactions at the end of the timeout.
      - `SHUTDOWN_FORCE` - Forcefully shuts down the database at the end of the timeout.
      Specified by:
        `shutdownDatabase` in interface `MaintenanceManager`
      Parameters:
        `shutdownMode` - One of `SHUTDOWN_ATTACH`, `SHUTDOWN_TRANSACTIONAL`, or `SHUTDOWN_FORCE`.
        `timeout` - The maximum amount of time allocated for the operation, in seconds
      Throws:
        `java.sql.SQLException` - if the requested operation cannot be completed within the given timeout, or a database access error occurs

    - #### shutdownDatabase

          public void shutdownDatabase(byte operationMode,
                              int shutdownModeEx,
                              int timeout)
                                throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Shutdown the current database with enhanced modes (FB 2.5 or higher).

      There are three operation modes for shutdown available:

      - `OPERATION_MODE_MULTI` - Multi-user maintenance. Unlimited SYSDBA/database owner connections are allowed.
      - `OPERATION_MODE_SINGLE` - Single-user maintenance. Only one SYSDBA/database owner connection is allowed.
      - `OPERATION_MODE_FULL_SHUTDOWN` - Full shutdown. Full exclusive shutdown. No connections are allowed.

      There are three extended shutdown modes for shutdown available:

      - `SHUTDOWNEX_FORCE` - Force shutdown.
      - `SHUTDOWNEX_ATTACHMENTS` - Shutdown attachments.
      - `SHUTDOWNEX_TRANSACTIONS` - Shutdown transactions.
      Specified by:
        `shutdownDatabase` in interface `MaintenanceManager`
      Parameters:
        `operationMode` - one of `OPERATION_MODE_*` operation modes listed above
        `shutdownModeEx` - one of `SHUTDOWNEX_*` extended shutdown modes listed above
        `timeout` - The maximum amount of time allocated for the operation, in seconds. 0 = immediately.
      Throws:
        `java.sql.SQLException` - if the requested operation cannot be completed within the given timeout, or a database access error occurs

    - #### bringDatabaseOnline

          public void bringDatabaseOnline()
                                   throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Bring a shutdown database online.
      Specified by:
        `bringDatabaseOnline` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### bringDatabaseOnline

          public void bringDatabaseOnline(byte operationMode)
                                   throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Bring a shutdown database online with enhanced operation modes (FB 2.5 or higher).

      There are three operation modes for bringing a database online available:

      - `OPERATION_MODE_NORMAL` - Normal operation modes.
      - `OPERATION_MODE_MULTI` - Multi-user maintenance. Unlimited SYSDBA/database owner connections are allowed.
      - `OPERATION_MODE_SINGLE` - Single-user maintenance. Only one SYSDBA/database owner connection is allowed.
      Specified by:
        `bringDatabaseOnline` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### markCorruptRecords

          public void markCorruptRecords()
                                  throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Mark corrupt records in the database as unavailable.

      This operation ensures that the corrupt records are skipped (for example, during a subsequent backup).

      Specified by:
        `markCorruptRecords` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### validateDatabase

          public void validateDatabase()
                                throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Locate and release database pages that are allocated but unassigned to any data structures. This method also reports corrupt structures.
      Specified by:
        `validateDatabase` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### validateDatabase

          public void validateDatabase(int options)
                                throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Locate and release database pages that are allocated but unassigned to any data structures. This method also reports corrupt structures.

      The value supplied for `options` must be one of the following:

      - 0 - Simple validation
      - `VALIDATE_READ_ONLY` - read-only validation, no repair
      - `VALIDATE_FULL` - full validation and repair

      The value for `options` can additionally be combined in a bitmask with `VALIDATE_IGNORE_CHECKSUM` to ignore checksums while performing validation.

      Specified by:
        `validateDatabase` in interface `MaintenanceManager`
      Parameters:
        `options` - Either 0, `VALIDATE_READ_ONLY`, or `VALIDATE_FULL`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### setSweepThreshold

          public void setSweepThreshold(int transactions)
                                 throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Set the database automatic sweep interval to a given number of transactions.

      The Firebird default value is 20,000. If `transactions` is 0, automatic sweeping is disabled.

      Specified by:
        `setSweepThreshold` in interface `MaintenanceManager`
      Parameters:
        `transactions` - The interval of transactions between automatic sweeps of the database. Can be set to 0, which disables automatic sweeping of the database.
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### sweepDatabase

          public void sweepDatabase()
                             throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Perform an immediate sweep of the database.
      Specified by:
        `sweepDatabase` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### activateShadowFile

          public void activateShadowFile()
                                  throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Activate a database shadow file to be used as the actual database.

      This method is the equivalent of `gfix -activate`.

      Specified by:
        `activateShadowFile` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### killUnavailableShadows

          public void killUnavailableShadows()
                                      throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Remove references to unavailable shadow files.

      This method is the equivalent of `gfix -kill`.

      Specified by:
        `killUnavailableShadows` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### listLimboTransactions

          @Deprecated
          public void listLimboTransactions()
                                     throws java.sql.SQLException

      Deprecated.
      Description copied from interface: `MaintenanceManager`
      Retrieve the ID of each limbo transaction. The output of this method is written to the logger.
      Specified by:
        `listLimboTransactions` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### limboTransactionsAsList

          public java.util.List<java.lang.Long> limboTransactionsAsList()
                                                                 throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Retrieve the ID of each limbo transaction as a List of Long objects.
      Specified by:
        `limboTransactionsAsList` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### getLimboTransactions

          public long[] getLimboTransactions()
                                      throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Retrieve the ID of each limbo transaction as an array of longs.

      In Firebird 3, transactions are (unsigned) 48 bit longs.

      Specified by:
        `getLimboTransactions` in interface `MaintenanceManager`
      Throws:
        `java.sql.SQLException` - if a database access error occurs

    - #### commitTransaction

          @Deprecated
          public void commitTransaction(int transactionId)
                                 throws java.sql.SQLException

      Deprecated.
      Description copied from interface: `MaintenanceManager`
      Commit a limbo transaction based on its ID.
      Specified by:
        `commitTransaction` in interface `MaintenanceManager`
      Parameters:
        `transactionId` - The ID of the limbo transaction to be committed
      Throws:
        `java.sql.SQLException` - if a database access error occurs or the given transaction ID is not valid

    - #### commitTransaction

          public void commitTransaction(long transactionId)
                                 throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Commit a limbo transaction based on its ID.

      The transaction id is expected to be a positive long. If you have a negative `int`, either call the - deprecated - `MaintenanceManager.commitTransaction(int)`, or convert the int to an unsigned long using `NumericHelper.toUnsignedLong(int)`

      Specified by:
        `commitTransaction` in interface `MaintenanceManager`
      Parameters:
        `transactionId` - The ID of the limbo transaction to be committed (must be `> 0`)
      Throws:
        `java.sql.SQLException` - if a database access error occurs or the given transaction ID is not valid

    - #### rollbackTransaction

          @Deprecated
          public void rollbackTransaction(int transactionId)
                                   throws java.sql.SQLException

      Deprecated.
      Description copied from interface: `MaintenanceManager`
      Rollback a limbo transaction based on its ID.
      Specified by:
        `rollbackTransaction` in interface `MaintenanceManager`
      Parameters:
        `transactionId` - The ID of the limbo transaction to be rolled back
      Throws:
        `java.sql.SQLException` - if a database access error occurs or the given transaction ID is not valid

    - #### rollbackTransaction

          public void rollbackTransaction(long transactionId)
                                   throws java.sql.SQLException

      Description copied from interface: `MaintenanceManager`
      Rollback a limbo transaction based on its ID.

      The transaction id is expected to be a positive long. If you have a negative `int`, either call the - deprecated - `MaintenanceManager.rollbackTransaction(int)`, or convert the int to an unsigned long using `NumericHelper.toUnsignedLong(int)`

      Specified by:
        `rollbackTransaction` in interface `MaintenanceManager`
      Parameters:
        `transactionId` - The ID of the limbo transaction to be rolled back (must be `> 0`)
      Throws:
        `java.sql.SQLException` - if a database access error occurs or the given transaction ID is not valid

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