btr0types.h

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/** @file include/btr0types.h
 The index tree general types
 
 Created 2/17/1996 Heikki Tuuri
 *************************************************************************/
 
#ifndef btr0types_h
#define btr0types_h
 
#include "univ.i"
 
#include "page0size.h"
#include "page0types.h"
#include "rem0types.h"
#include "sync0rw.h"
#include "ut0rnd.h"
 
/** Persistent cursor */
struct btr_pcur_t;
/** B-tree cursor */
struct btr_cur_t;
/** B-tree search information for the adaptive hash index */
struct btr_search_t;
 
/** Is search system enabled.
Search system is protected by array of latches. */
extern std::atomic_bool btr_search_enabled;
 
/** Number of adaptive hash index partition. */
extern ulong btr_ahi_parts;
 
/** Structure to facilitate fast modulo for number of adaptive hash index
partition. */
extern ut::fast_modulo_t btr_ahi_parts_fast_modulo;
 
/** The size of a reference to data stored on a different page.
The reference is stored at the end of the prefix of the field
in the index record. */
constexpr uint32_t BTR_EXTERN_FIELD_REF_SIZE = FIELD_REF_SIZE;
 
/** If the data don't exceed the size, the data are stored locally. */
constexpr uint32_t BTR_EXTERN_LOCAL_STORED_MAX_SIZE =
    BTR_EXTERN_FIELD_REF_SIZE * 2;
 
#endif