mirror of
https://github.com/MariaDB/server.git
synced 2025-10-26 16:38:11 +01:00
1ed09cfdcb
innodb_stats_transient_sample_pages, innodb_stats_persistent_sample_pages: Change the type to UNSIGNED, because the number of pages in a table is limited to 32 bits by the InnoDB file format. btr_get_size_and_reserved(), fseg_get_n_frag_pages(), fseg_n_reserved_pages_low(), fseg_n_reserved_pages(): Return uint32_t. The file format limits page numbers to 32 bits. dict_table_t::stat: An Atomic_relaxed<uint32_t> that combines a number of metadata fields. innodb_copy_stat_flags(): Copy the statistics flags from TABLE_SHARE or HA_CREATE_INFO. dict_table_t::stats_initialized(), dict_table_t::stats_is_persistent(): Accessors to dict_table_t::stat. Reviewed by: Thirunarayanan Balathandayuthapani
55 lines
2.6 KiB
C
55 lines
2.6 KiB
C
/*****************************************************************************
|
|
|
|
Copyright (c) 2023, MariaDB Corporation.
|
|
|
|
This program is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free Software
|
|
Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful, but WITHOUT
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
this program; if not, write to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
#include "db0err.h"
|
|
|
|
/* The purpose of the change buffer was to reduce random disk access.
|
|
When we wished to
|
|
(1) insert a record into a non-unique secondary index,
|
|
(2) delete-mark a secondary index record,
|
|
(3) delete a secondary index record as part of purge (but not ROLLBACK),
|
|
and the B-tree leaf page where the record belongs to is not in the buffer
|
|
pool, we inserted a record into the change buffer B-tree, indexed by
|
|
the page identifier. When the page was eventually read into the buffer
|
|
pool, we looked up the change buffer B-tree for any modifications to the
|
|
page, applied these upon the completion of the read operation. This
|
|
was called the insert buffer merge.
|
|
|
|
There was a hash index of the change buffer B-tree, implemented as the
|
|
"change buffer bitmap". Bits in these bitmap pages indicated how full
|
|
the page roughly was, and whether any records for the page identifier
|
|
exist in the change buffer. The "free" bits had to be updated as part of
|
|
operations that modified secondary index leaf pages.
|
|
|
|
Because the change buffer has been removed, we will no longer update
|
|
any change buffer bitmap pages. Instead, on database startup, we will
|
|
check if an upgrade needs to be performed, and apply any buffered
|
|
changes if that is the case. Finally, the change buffer will be
|
|
transformed to a format that will not be recognized by earlier
|
|
versions of MariaDB Server, to prevent downgrades from causing
|
|
corruption (due to the removed updates of the bitmap pages) when the
|
|
change buffer might be enabled. */
|
|
|
|
/** Check if ibuf_upgrade() is needed as part of server startup.
|
|
@return error code
|
|
@retval DB_SUCCESS if no upgrade is needed
|
|
@retval DB_FAIL if the change buffer is not empty (need ibuf_upgrade()) */
|
|
dberr_t ibuf_upgrade_needed();
|
|
|
|
/** Upgrade the change buffer after all redo log has been applied. */
|
|
dberr_t ibuf_upgrade();
|