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This should have been part of MDEV-12288. trx_undo_t::del_marks: Remove. Purge needs to process all undo log records in order to reset the DB_TRX_ID. Before MDEV-12288, it sufficed to only delete the purgeable delete-marked records, and it ignore other undo log. trx_rseg_t::needs_purge: Renamed from trx_rseg_t::last_del_marks. Indicates whether a rollback segment needs to be processed by purge. TRX_UNDO_NEEDS_PURGE: Renamed from TRX_UNDO_DEL_MARKS. Indicates whether a rollback segment needs to be processed by purge. This will be 1 until trx_purge_free_segment() has been invoked. row_purge_record_func(): Set the is_insert flag for TRX_UNDO_INSERT_REC, so that the DB_ROLL_PTR will match in row_purge_reset_trx_id(). trx_purge_fetch_next_rec(): Add a comment about row_purge_record_func() going to set the is_insert flag. trx_purge_read_undo_rec(): Always attempt to read the undo log record. trx_purge_get_next_rec(): Do not skip any undo log records. Even when no clustered index record is going to be removed, we may want to reset some DB_TRX_ID,DB_ROLL_PTR. trx_undo_rec_get_cmpl_info(), trx_undo_rec_get_extern_storage(): Remove. trx_purge_add_undo_to_history(): Set the TRX_UNDO_NEEDS_PURGE flag so that the resetting will work on undo logs that were originally created before MDEV-12288 (MariaDB 10.3.1). trx_undo_roll_ptr_is_insert(), trx_purge_free_segment(): Cleanup (should be no functional change).
70 lines
2.2 KiB
Text
70 lines
2.2 KiB
Text
/*****************************************************************************
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Copyright (c) 1996, 2014, Oracle and/or its affiliates. All Rights Reserved.
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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, Suite 500, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/trx0rec.ic
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Transaction undo log record
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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/**********************************************************************//**
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Reads from an undo log record the record type.
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@return record type */
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UNIV_INLINE
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ulint
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trx_undo_rec_get_type(
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/*==================*/
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const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
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{
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return(mach_read_from_1(undo_rec + 2) & (TRX_UNDO_CMPL_INFO_MULT - 1));
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}
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/**********************************************************************//**
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Reads the undo log record number.
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@return undo no */
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UNIV_INLINE
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undo_no_t
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trx_undo_rec_get_undo_no(
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/*=====================*/
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const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
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{
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const byte* ptr;
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ptr = undo_rec + 3;
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return(mach_u64_read_much_compressed(ptr));
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}
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/***********************************************************************//**
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Copies the undo record to the heap.
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@return own: copy of undo log record */
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UNIV_INLINE
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trx_undo_rec_t*
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trx_undo_rec_copy(
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/*==============*/
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const trx_undo_rec_t* undo_rec, /*!< in: undo log record */
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mem_heap_t* heap) /*!< in: heap where copied */
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{
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ulint len;
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len = mach_read_from_2(undo_rec)
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- ut_align_offset(undo_rec, UNIV_PAGE_SIZE);
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ut_ad(len < UNIV_PAGE_SIZE);
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return((trx_undo_rec_t*) mem_heap_dup(heap, undo_rec, len));
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}
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