btr0cur.ic File Reference

The index tree cursor. More...

#include "btr0btr.h"

Macros
#define	LIMIT_OPTIMISTIC_INSERT_DEBUG(NREC, CODE)

Functions
static page_cur_t *	btr_cur_get_page_cur (const btr_cur_t *cursor)
	Returns the page cursor component of a tree cursor. More...
static buf_block_t *	btr_cur_get_block (const btr_cur_t *cursor)
	Returns the buffer block on which the tree cursor is positioned. More...
static rec_t *	btr_cur_get_rec (const btr_cur_t *cursor)
	Returns the record pointer of a tree cursor. More...
static page_zip_des_t *	btr_cur_get_page_zip (btr_cur_t *cursor)
	Returns the compressed page on which the tree cursor is positioned. More...
static page_t *	btr_cur_get_page (btr_cur_t *cursor)
	Returns the page of a tree cursor. More...
static void	btr_cur_position (dict_index_t *index, rec_t *rec, buf_block_t *block, btr_cur_t *cursor)
	Positions a tree cursor at a given record. More...
static bool	btr_cur_compress_recommendation (btr_cur_t *cursor, mtr_t *mtr)
	Checks if compressing an index page where a btr cursor is placed makes sense. More...
static bool	btr_cur_can_delete_without_compress (btr_cur_t *cursor, ulint rec_size, mtr_t *mtr)
	Checks if the record on which the cursor is placed can be deleted without making tree compression necessary (or, recommended). More...
static void	btr_rec_set_deleted_flag (rec_t *rec, page_zip_des_t *page_zip, bool flag)

Detailed Description

The index tree cursor.

Created 10/16/1994 Heikki Tuuri

Macro Definition Documentation

LIMIT_OPTIMISTIC_INSERT_DEBUG

#define LIMIT_OPTIMISTIC_INSERT_DEBUG	(		NREC,
			CODE
	)

Value:

  if (btr_cur_limit_optimistic_insert_debug > 1 &&              \
      (NREC) >= (ulint)btr_cur_limit_optimistic_insert_debug) { \
    CODE;                                                       \
  }

Function Documentation

btr_cur_can_delete_without_compress()

static bool btr_cur_can_delete_without_compress ( btr_cur_t *  cursor, ulint  rec_size, mtr_t *  mtr  )

inlinestatic

Checks if the record on which the cursor is placed can be deleted without making tree compression necessary (or, recommended).

Returns

true if can be deleted without recommended compression

Parameters

cursor	in: btr cursor
rec_size	in: rec_get_size(btr_cur_get_rec(cursor))
mtr	in: mtr

btr_cur_compress_recommendation()

static bool btr_cur_compress_recommendation ( btr_cur_t *  cursor, mtr_t *  mtr  )

inlinestatic

Checks if compressing an index page where a btr cursor is placed makes sense.

Returns

true if compression is recommended

Parameters

cursor	in: btr cursor
mtr	in: mtr

btr_cur_get_block()

static buf_block_t * btr_cur_get_block ( const btr_cur_t *  cursor )

inlinestatic

Returns the buffer block on which the tree cursor is positioned.

Returns

pointer to buffer block

Parameters

cursor

in: tree cursor

btr_cur_get_page()

static page_t * btr_cur_get_page ( btr_cur_t *  cursor )

inlinestatic

Returns the page of a tree cursor.

Returns

pointer to page

Parameters

cursor

in: tree cursor

btr_cur_get_page_cur()

static page_cur_t * btr_cur_get_page_cur ( const btr_cur_t *  cursor )

inlinestatic

Returns the page cursor component of a tree cursor.

Returns

pointer to page cursor component

Parameters

cursor

in: tree cursor

btr_cur_get_page_zip()

static page_zip_des_t * btr_cur_get_page_zip ( btr_cur_t *  cursor )

inlinestatic

Returns the compressed page on which the tree cursor is positioned.

Returns

pointer to compressed page, or NULL if the page is not compressed

Parameters

cursor

in: tree cursor

btr_cur_get_rec()

static rec_t * btr_cur_get_rec ( const btr_cur_t *  cursor )

inlinestatic

Returns the record pointer of a tree cursor.

Returns

pointer to record

Parameters

cursor

in: tree cursor

btr_cur_position()

static void btr_cur_position ( dict_index_t *  index, rec_t *  rec, buf_block_t *  block, btr_cur_t *  cursor  )

inlinestatic

Positions a tree cursor at a given record.

Parameters

index	in: index
rec	in: record in tree
block	in: buffer block of rec
cursor	out: cursor

btr_rec_set_deleted_flag()

static void btr_rec_set_deleted_flag ( rec_t *  rec, page_zip_des_t *  page_zip, bool  flag  )

inlinestatic