btr0cur.ic File Reference

#include "btr0btr.h"

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Macros
#define	LIMIT_OPTIMISTIC_INSERT_DEBUG(NREC, CODE)

Functions
UNIV_INLINE page_cur_t *	btr_cur_get_page_cur (const btr_cur_t *cursor)
UNIV_INLINE buf_block_t *	btr_cur_get_block (const btr_cur_t *cursor)
UNIV_INLINE rec_t *	btr_cur_get_rec (const btr_cur_t *cursor)
UNIV_INLINE page_zip_des_t *	btr_cur_get_page_zip (btr_cur_t *cursor)
UNIV_INLINE void	btr_cur_invalidate (btr_cur_t *cursor)
UNIV_INLINE page_t *	btr_cur_get_page (btr_cur_t *cursor)
UNIV_INLINE void	btr_cur_position (dict_index_t *index, rec_t *rec, buf_block_t *block, btr_cur_t *cursor)
UNIV_INLINE ibool	btr_cur_compress_recommendation (btr_cur_t *cursor, mtr_t *mtr)
UNIV_INLINE ibool	btr_cur_can_delete_without_compress (btr_cur_t *cursor, ulint rec_size, mtr_t *mtr)
UNIV_INLINE ibool	btr_blob_op_is_update (enum blob_op op)

Detailed Description

The index tree cursor

Created 10/16/1994 Heikki Tuuri

Macro Definition Documentation

#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

UNIV_INLINE ibool btr_blob_op_is_update

(

enum blob_op

op

)

Determine if an operation on off-page columns is an update.

Returns

TRUE if op != BTR_STORE_INSERT

Parameters

op	in: operation

UNIV_INLINE ibool 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).

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

UNIV_INLINE ibool 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.

Returns

TRUE if compression is recommended

Parameters

cursor	in: btr cursor
mtr	in: mtr

UNIV_INLINE buf_block_t* btr_cur_get_block

(

const btr_cur_t *

cursor

)

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

Returns

pointer to buffer block

Parameters

cursor

in: tree cursor

UNIV_INLINE page_t* btr_cur_get_page

(

btr_cur_t *

cursor

)

Returns the page of a tree cursor.

Returns

pointer to page

Parameters

cursor

in: tree cursor

UNIV_INLINE page_cur_t* btr_cur_get_page_cur

(

const btr_cur_t *

cursor

)

Returns the page cursor component of a tree cursor.

Returns

pointer to page cursor component

Parameters

cursor

in: tree cursor

UNIV_INLINE page_zip_des_t* btr_cur_get_page_zip

(

btr_cur_t *

cursor

)

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

UNIV_INLINE rec_t* btr_cur_get_rec

(

const btr_cur_t *

cursor

)

Returns the record pointer of a tree cursor.

Returns

pointer to record

Parameters

cursor

in: tree cursor

UNIV_INLINE void btr_cur_invalidate

(

btr_cur_t *

cursor

)

Invalidates a tree cursor by setting record pointer to NULL.

Parameters

cursor

in: tree cursor

UNIV_INLINE 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.

Parameters

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