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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
/*****************************************************************************
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Copyright (c) 2023, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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#include "db0err.h"
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/* The purpose of the change buffer was to reduce random disk access.
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When we wished to
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(1) insert a record into a non-unique secondary index,
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(2) delete-mark a secondary index record,
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(3) delete a secondary index record as part of purge (but not ROLLBACK),
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and the B-tree leaf page where the record belongs to is not in the buffer
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pool, we inserted a record into the change buffer B-tree, indexed by
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the page identifier. When the page was eventually read into the buffer
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pool, we looked up the change buffer B-tree for any modifications to the
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page, applied these upon the completion of the read operation. This
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was called the insert buffer merge.
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There was a hash index of the change buffer B-tree, implemented as the
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"change buffer bitmap". Bits in these bitmap pages indicated how full
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the page roughly was, and whether any records for the page identifier
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exist in the change buffer. The "free" bits had to be updated as part of
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operations that modified secondary index leaf pages.
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Because the change buffer has been removed, we will no longer update
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any change buffer bitmap pages. Instead, on database startup, we will
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check if an upgrade needs to be performed, and apply any buffered
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changes if that is the case. Finally, the change buffer will be
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transformed to a format that will not be recognized by earlier
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versions of MariaDB Server, to prevent downgrades from causing
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corruption (due to the removed updates of the bitmap pages) when the
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change buffer might be enabled. */
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/** Check if ibuf_upgrade() is needed as part of server startup.
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@return error code
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@retval DB_SUCCESS if no upgrade is needed
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@retval DB_FAIL if the change buffer is not empty (need ibuf_upgrade()) */
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dberr_t ibuf_upgrade_needed();
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/** Upgrade the change buffer after all redo log has been applied. */
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dberr_t ibuf_upgrade();
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