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 Summary

Fields

Modifier and Type	Field	Description
static String	BACKGROUND	WAL entries are periodically written instead of immediately after each operation
static String	CHECKSUM	If TRUE each entry will be checked against a protective checksum.
static String	FALSE
static String	FLUSH	Protects entries in the event of a database crash
static String	FLUSH_FREQUENCY	Specifies how frequently WAL entries are written with background sync.
static String	FSYNC	Protects entries in the event of an OS crash
static String	MAX_SEGMENT_SIZE	Maximum size of an individual segment file
static String	NONE	Disables the WAL
static String	OVERRIDE_NON_DEFAULT	If TRUE tables with unique WAL settings will be overridden when applying a system level change.
static 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.
static String	RESTORE_SYSTEM_SETTINGS	If TRUE tables with unique WAL settings will be reverted to the current global settings.
static String	SEGMENT_COUNT	Approximate number of segment files to split the WAL across.
static String	SYNC_POLICY	Maximum size of an individual segment file.
static String	TRUE

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

MAX_SEGMENT_SIZE

public static final String MAX_SEGMENT_SIZE

Maximum size of an individual segment file

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Constant Field Values

SEGMENT_COUNT

public static final String SEGMENT_COUNT

Approximate number of segment files to split the WAL across. Must be at least two.

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Constant Field Values

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

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Constant Field Values

NONE

public static final String NONE

Disables the WAL

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Constant Field Values

BACKGROUND

public static final String BACKGROUND

WAL entries are periodically written instead of immediately after each operation

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Constant Field Values

FLUSH

public static final String FLUSH

Protects entries in the event of a database crash

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Constant Field Values

FSYNC

public static final String FSYNC

Protects entries in the event of an OS crash

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Constant Field Values

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 '*'.

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Constant Field Values

CHECKSUM

public static final String CHECKSUM

If TRUE each entry will be checked against a protective checksum. Supported values:

• TRUE
• FALSE

The default value is TRUE.

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Constant Field Values

TRUE

public static final String TRUE

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Constant Field Values

FALSE

public static final String FALSE

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Constant Field Values

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:

• TRUE
• FALSE

The default value is FALSE.

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Constant Field Values

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:

• TRUE
• FALSE

The default value is FALSE.

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Constant Field Values

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:

• TRUE
• FALSE

The default value is TRUE.

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Constant Field Values