diff options
author | unknown <monty@donna.mysql.com> | 2001-02-17 14:19:19 +0200 |
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committer | unknown <monty@donna.mysql.com> | 2001-02-17 14:19:19 +0200 |
commit | 2662b59306ef0cd495fa6e2edf7129e58a11393a (patch) | |
tree | bfe39951a73e906579ab819bf5198ad8f3a64a36 /innobase/include/btr0cur.ic | |
parent | 66de55a56bdcf2f7a9c0c4f8e19b3e761475e202 (diff) | |
download | mariadb-git-2662b59306ef0cd495fa6e2edf7129e58a11393a.tar.gz |
Added Innobase to source distribution
Docs/manual.texi:
Added Innobase documentation
configure.in:
Incremented version
include/my_base.h:
Added option for Innobase
myisam/mi_check.c:
cleanup
mysql-test/t/bdb.test:
cleanup
mysql-test/t/innobase.test:
Extended with new tests from bdb.test
mysql-test/t/merge.test:
Added test of SHOW create
mysys/my_init.c:
Fix for UNIXWARE 7
scripts/mysql_install_db.sh:
Always write how to start mysqld
scripts/safe_mysqld.sh:
Fixed type
sql/ha_innobase.cc:
Update to new version
sql/ha_innobase.h:
Update to new version
sql/handler.h:
Added 'update_table_comment()' and 'append_create_info()'
sql/sql_delete.cc:
Fixes for Innobase
sql/sql_select.cc:
Fixes for Innobase
sql/sql_show.cc:
Append create information (for MERGE tables)
sql/sql_update.cc:
Fixes for Innobase
Diffstat (limited to 'innobase/include/btr0cur.ic')
-rw-r--r-- | innobase/include/btr0cur.ic | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/innobase/include/btr0cur.ic b/innobase/include/btr0cur.ic new file mode 100644 index 00000000000..a3a04b60c45 --- /dev/null +++ b/innobase/include/btr0cur.ic @@ -0,0 +1,172 @@ +/****************************************************** +The index tree cursor + +(c) 1994-1996 Innobase Oy + +Created 10/16/1994 Heikki Tuuri +*******************************************************/ + +#include "btr0btr.h" + +/************************************************************* +Returns the page cursor component of a tree cursor. */ +UNIV_INLINE +page_cur_t* +btr_cur_get_page_cur( +/*=================*/ + /* out: pointer to page cursor component */ + btr_cur_t* cursor) /* in: tree cursor */ +{ + return(&(cursor->page_cur)); +} + +/************************************************************* +Returns the record pointer of a tree cursor. */ +UNIV_INLINE +rec_t* +btr_cur_get_rec( +/*============*/ + /* out: pointer to record */ + btr_cur_t* cursor) /* in: tree cursor */ +{ + return(page_cur_get_rec(&(cursor->page_cur))); +} + +/************************************************************* +Invalidates a tree cursor by setting record pointer to NULL. */ +UNIV_INLINE +void +btr_cur_invalidate( +/*===============*/ + btr_cur_t* cursor) /* in: tree cursor */ +{ + page_cur_invalidate(&(cursor->page_cur)); +} + +/************************************************************* +Returns the page of a tree cursor. */ +UNIV_INLINE +page_t* +btr_cur_get_page( +/*=============*/ + /* out: pointer to page */ + btr_cur_t* cursor) /* in: tree cursor */ +{ + return(buf_frame_align(page_cur_get_rec(&(cursor->page_cur)))); +} + +/************************************************************* +Returns the tree of a cursor. */ +UNIV_INLINE +dict_tree_t* +btr_cur_get_tree( +/*=============*/ + /* out: tree */ + btr_cur_t* cursor) /* in: tree cursor */ +{ + return((cursor->index)->tree); +} + +/************************************************************* +Positions a tree cursor at a given record. */ +UNIV_INLINE +void +btr_cur_position( +/*=============*/ + dict_index_t* index, /* in: index */ + rec_t* rec, /* in: record in tree */ + btr_cur_t* cursor) /* in: cursor */ +{ + page_cur_position(rec, btr_cur_get_page_cur(cursor)); + + cursor->index = index; +} + +/************************************************************************* +Checks if compressing an index page where a btr cursor is placed makes +sense. */ +UNIV_INLINE +ibool +btr_cur_compress_recommendation( +/*============================*/ + /* out: TRUE if compression is recommended */ + btr_cur_t* cursor, /* in: btr cursor */ + mtr_t* mtr) /* in: mtr */ +{ + page_t* page; + + ut_ad(mtr_memo_contains(mtr, buf_block_align( + btr_cur_get_page(cursor)), + MTR_MEMO_PAGE_X_FIX)); + + page = btr_cur_get_page(cursor); + + if ((page_get_data_size(page) < BTR_CUR_PAGE_COMPRESS_LIMIT) + || ((btr_page_get_next(page, mtr) == FIL_NULL) + && (btr_page_get_prev(page, mtr) == FIL_NULL))) { + + /* The page fillfactor has dropped below a predefined + minimum value OR the level in the B-tree contains just + one page: we recommend compression if this is not the + root page. */ + + if (dict_tree_get_page((cursor->index)->tree) + == buf_frame_get_page_no(page)) { + + /* It is the root page */ + + return(FALSE); + } + + return(TRUE); + } + + return(FALSE); +} + +/************************************************************************* +Checks if the record on which the cursor is placed can be deleted without +making tree compression necessary (or, recommended). */ +UNIV_INLINE +ibool +btr_cur_can_delete_without_compress( +/*================================*/ + /* out: TRUE if can be deleted without + recommended compression */ + btr_cur_t* cursor, /* in: btr cursor */ + mtr_t* mtr) /* in: mtr */ +{ + ulint rec_size; + page_t* page; + + ut_ad(mtr_memo_contains(mtr, buf_block_align( + btr_cur_get_page(cursor)), + MTR_MEMO_PAGE_X_FIX)); + + rec_size = rec_get_size(btr_cur_get_rec(cursor)); + + page = btr_cur_get_page(cursor); + + if ((page_get_data_size(page) - rec_size < BTR_CUR_PAGE_COMPRESS_LIMIT) + || ((btr_page_get_next(page, mtr) == FIL_NULL) + && (btr_page_get_prev(page, mtr) == FIL_NULL)) + || (page_get_n_recs(page) < 2)) { + + /* The page fillfactor will drop below a predefined + minimum value, OR the level in the B-tree contains just + one page, OR the page will become empty: we recommend + compression if this is not the root page. */ + + if (dict_tree_get_page((cursor->index)->tree) + == buf_frame_get_page_no(page)) { + + /* It is the root page */ + + return(TRUE); + } + + return(FALSE); + } + + return(TRUE); +} |