mirror of
https://github.com/MariaDB/server.git
synced 2025-01-29 02:05:57 +01:00
cdc7253787
MyISAM and Aria used to lie to the server about the reflength value. One value was used internally, it was stored on disk, e.g. in indexes, and couldn't be changed without full table rebuild. A differently calculated value was reported to the server - that value was sometimes larger than the true reflength. That caused the server to allocate more memory per position than necessary - affecting filesort, join buffer usage, optimizer cost calculations, and may be more.
135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/* Copyright (c) 2000, 2001, 2003-2007 MySQL AB, 2009 Sun Microsystems, Inc.
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Use is subject to license terms.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/* Return useful base information for an open table */
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#include "myisamdef.h"
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#ifdef _WIN32
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#include <sys/stat.h>
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#endif
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/* Get position to last record */
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my_off_t mi_position(MI_INFO *info)
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{
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return info->lastpos;
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}
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/* Get information about the table */
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/* if flag == 2 one get current info (no sync from database */
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int mi_status(MI_INFO *info, register MI_ISAMINFO *x, uint flag)
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{
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MY_STAT state;
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MYISAM_SHARE *share=info->s;
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DBUG_ENTER("mi_status");
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x->recpos = info->lastpos;
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if (flag == HA_STATUS_POS)
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DBUG_RETURN(0); /* Compatible with ISAM */
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if (!(flag & HA_STATUS_NO_LOCK))
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{
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mysql_mutex_lock(&share->intern_lock);
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(void) _mi_readinfo(info,F_RDLCK,0);
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fast_mi_writeinfo(info);
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mysql_mutex_unlock(&share->intern_lock);
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}
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if (flag & HA_STATUS_VARIABLE)
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{
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x->records = info->state->records;
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x->deleted = info->state->del;
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x->delete_length = info->state->empty;
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x->data_file_length =info->state->data_file_length;
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x->index_file_length=info->state->key_file_length;
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x->keys = share->state.header.keys;
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x->check_time = share->state.check_time;
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x->mean_reclength= x->records ?
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(ulong) ((x->data_file_length - x->delete_length) / x->records) :
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(ulong) share->min_pack_length;
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}
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if (flag & HA_STATUS_ERRKEY)
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{
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x->errkey = info->errkey;
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x->dupp_key_pos= info->dupp_key_pos;
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}
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if (flag & HA_STATUS_CONST)
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{
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x->reclength = share->base.reclength;
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x->max_data_file_length=share->base.max_data_file_length;
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x->max_index_file_length=info->s->base.max_key_file_length;
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x->filenr = info->dfile;
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x->options = share->options;
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x->create_time=share->state.create_time;
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x->reflength= share->base.rec_reflength;
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x->record_offset= ((share->options &
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(HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ?
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0L : share->base.pack_reclength);
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x->sortkey= -1; /* No clustering */
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x->rec_per_key = share->state.rec_per_key_part;
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x->key_map = share->state.key_map;
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x->data_file_name = share->data_file_name;
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x->index_file_name = share->index_file_name;
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}
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if ((flag & HA_STATUS_TIME) && !mysql_file_fstat(info->dfile, &state, MYF(0)))
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{
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MSAN_STAT_WORKAROUND(&state);
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x->update_time=state.st_mtime;
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}
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else
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x->update_time=0;
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if (flag & HA_STATUS_AUTO)
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{
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x->auto_increment= share->state.auto_increment+1;
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if (!x->auto_increment) /* This shouldn't happen */
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x->auto_increment= ~(ulonglong) 0;
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}
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DBUG_RETURN(0);
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}
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/*
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Write a message to the error log.
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SYNOPSIS
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mi_report_error()
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file_name Name of table file (e.g. index_file_name).
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errcode Error number.
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DESCRIPTION
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This function supplies my_error() with a table name. Most error
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messages need one. Since string arguments in error messages are limited
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to 64 characters by convention, we ensure that in case of truncation,
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that the end of the index file path is in the message. This contains
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the most valuable information (the table name and the database name).
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RETURN
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void
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*/
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void mi_report_error(int errcode, const char *file_name)
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{
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size_t lgt;
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DBUG_ENTER("mi_report_error");
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DBUG_PRINT("enter",("errcode %d, table '%s'", errcode, file_name));
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if ((lgt= strlen(file_name)) > 64)
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file_name+= lgt - 64;
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my_error(errcode, MYF(ME_ERROR_LOG), file_name);
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DBUG_VOID_RETURN;
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}
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