global
Interface GlobalConst

All Known Implementing Classes:

BucketScan, BufMgr, DiskMgr, HashIndex, HashScan, HeapFile, HeapScan, HFPage, Page, PageId

public interface GlobalConst

Global constants; implement this interface to access them conveniently.

Field Summary

static int	EMPTY_SLOT Length of an "empty" slot in a heap file page.
static int	FIRST_PAGEID Page number of the first page in a database file.
static int	INVALID_PAGEID Page number of an invalid page (i.e.
static int	MAX_COLSIZE Maximum length of a column (in bytes).
static int	MAX_TUPSIZE Maximum length of a tuple (in bytes).
static int	NAME_MAXLEN Maximum size of a name (i.e.
static int	PAGE_SIZE Size of a page, in bytes.
static boolean	PIN_DISKIO Replace an existing memory page with the current disk page.
static boolean	PIN_MEMCPY Replace the buffer frame with an existing memory page.
static boolean	UNPIN_CLEAN Optimization to avoid writing to disk when unpinned.
static boolean	UNPIN_DIRTY Forces the page to be written to disk when unpinned.

Field Detail

PAGE_SIZE

static final int PAGE_SIZE

Size of a page, in bytes.

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Constant Field Values

INVALID_PAGEID

static final int INVALID_PAGEID

Page number of an invalid page (i.e. null pointer).

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Constant Field Values

FIRST_PAGEID

static final int FIRST_PAGEID

Page number of the first page in a database file.

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Constant Field Values

NAME_MAXLEN

static final int NAME_MAXLEN

Maximum size of a name (i.e. of files or attributes).

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Constant Field Values

PIN_MEMCPY

static final boolean PIN_MEMCPY

Replace the buffer frame with an existing memory page.

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Constant Field Values

PIN_DISKIO

static final boolean PIN_DISKIO

Replace an existing memory page with the current disk page.

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Constant Field Values

UNPIN_DIRTY

static final boolean UNPIN_DIRTY

Forces the page to be written to disk when unpinned.

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Constant Field Values

UNPIN_CLEAN

static final boolean UNPIN_CLEAN

Optimization to avoid writing to disk when unpinned.

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Constant Field Values

EMPTY_SLOT

static final int EMPTY_SLOT

Length of an "empty" slot in a heap file page.

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Constant Field Values

MAX_COLSIZE

static final int MAX_COLSIZE

Maximum length of a column (in bytes).

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Constant Field Values

MAX_TUPSIZE

static final int MAX_TUPSIZE

Maximum length of a tuple (in bytes).

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Constant Field Values