Skip to main content
Package com.gpudb.protocol

​
Class AlterWalRequest.Options

java.lang.Object
com.gpudb.protocol.AlterWalRequest.Options
Enclosing class:
AlterWalRequest
public static final class AlterWalRequest.Options extends Object
A set of string constants for the AlterWalRequest parameter options.

Optional parameters.

  • ​
    Field Details

    • ​
      MAX_SEGMENT_SIZE

      public static final String MAX_SEGMENT_SIZE
      Maximum size of an individual segment file.
      See Also:

    • ​
      SEGMENT_COUNT

      public static final String SEGMENT_COUNT
      Approximate number of segment files to split the WAL across. Must be at least two.
      See Also:

    • ​
      SYNC_POLICY

      public static final String SYNC_POLICY
      Maximum size of an individual segment file. Supported values:
      • NONE: Disables the WAL.
      • BACKGROUND: WAL entries are periodically written instead of immediately after each operation.
      • FLUSH: Protects entries in the event of a database crash.
      • FSYNC: Protects entries in the event of an OS crash.
      See Also:

    • ​
      NONE

      public static final String NONE
      Disables the WAL.
      See Also:

    • ​
      BACKGROUND

      public static final String BACKGROUND
      WAL entries are periodically written instead of immediately after each operation.
      See Also:

    • ​
      FLUSH

      public static final String FLUSH
      Protects entries in the event of a database crash.
      See Also:

    • ​
      FSYNC

      public static final String FSYNC
      Protects entries in the event of an OS crash.
      See Also:

    • ​
      FLUSH_FREQUENCY

      public static final String FLUSH_FREQUENCY
      Specifies how frequently WAL entries are written with background sync. This is a global setting and can only be used with the system options.table_names specifier ’*’.
      See Also:

    • ​
      CHECKSUM

      public static final String CHECKSUM
      If TRUE each entry will be checked against a protective checksum. Supported values:The default value is TRUE.
      See Also:

    • ​
      TRUE

      public static final String TRUE
      See Also:

    • ​
      FALSE

      public static final String FALSE
      See Also:

    • ​
      OVERRIDE_NON_DEFAULT

      public static final String OVERRIDE_NON_DEFAULT
      If TRUE tables with unique WAL settings will be overridden when applying a system level change. Supported values:The default value is FALSE.
      See Also:

    • ​
      RESTORE_SYSTEM_SETTINGS

      public static final String RESTORE_SYSTEM_SETTINGS
      If TRUE tables with unique WAL settings will be reverted to the current global settings. Cannot be used in conjunction with any other option. Supported values:The default value is FALSE.
      See Also:

    • ​
      PERSIST

      public static final String PERSIST
      If TRUE and a system-level change was requested, the system configuration will be written to disk upon successful application of this request. This will commit the changes from this request and any additional in-memory modifications. Supported values:The default value is TRUE.
      See Also: