1 /*****************************************************************************
3 Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
5 This program is free software; you can redistribute it and/or modify it under
6 the terms of the GNU General Public License as published by the Free Software
7 Foundation; version 2 of the License.
9 This program is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License along with
14 this program; if not, write to the Free Software Foundation, Inc.,
15 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *****************************************************************************/
19 /********************************************************************//**
20 @file include/btr0sea.ic
21 The index tree adaptive search
23 Created 2/17/1996 Heikki Tuuri
24 *************************************************************************/
30 /*********************************************************************//**
31 Updates the search info. */
34 btr_search_info_update_slow(
35 /*========================*/
36 btr_search_t* info, /*!< in/out: search info */
37 btr_cur_t* cursor);/*!< in: cursor which was just positioned */
39 /********************************************************************//**
40 Returns search info for an index.
41 @return search info; search mutex reserved */
46 dict_index_t* index) /*!< in: index */
50 return(index->search_info);
53 /*********************************************************************//**
54 Updates the search info. */
57 btr_search_info_update(
58 /*===================*/
59 dict_index_t* index, /*!< in: index of the cursor */
60 btr_cur_t* cursor) /*!< in: cursor which was just positioned */
64 #ifdef UNIV_SYNC_DEBUG
65 ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
66 ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
67 #endif /* UNIV_SYNC_DEBUG */
69 info = btr_search_get_info(index);
71 info->hash_analysis++;
73 if (info->hash_analysis < BTR_SEARCH_HASH_ANALYSIS) {
81 ut_ad(cursor->flag != BTR_CUR_HASH);
83 btr_search_info_update_slow(info, cursor);