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1bc5e3b971
maria_read_log used to always print a warning message at startup to say it is unsafe if ALTER TABLE was used. Now it prints it only if the log does show the problem (=ALTER TABLE or CREATE SELECT, which both disable logging of REDO_INSERT*). For that, when ha_maria::external_lock() disables transactionality it writes a LOGREC_INCOMPLETE_LOG to the log, which "maria_read_log -a" picks up to write a warning. REPAIR TABLE also disables those REDO_INSERT* but as maria_read_log executes LOGREC_REDO_REPAIR no warning is needed. storage/maria/ha_maria.cc: as we now log a record when disabling transactionility, we need the TRN to be set up first storage/maria/ma_blockrec.c: comment storage/maria/ma_loghandler.c: new type of log record storage/maria/ma_loghandler.h: new type of log record storage/maria/ma_recovery.c: * maria_apply_log() now returns a count of warnings. What currently produces warnings is: - skipping applying UNDOs though there are some (=> inconsistent table) - replaying log (in maria_read_log) though the log contains some ALTER TABLE or CREATE SELECT (log misses REDO_INSERT* for those and is so incomplete). Count of warnings affects the final message of maria_read_log and recovery (though in recovery none of the two conditions above should happen). * maria_read_log used to always print a warning message at startup to say it is unsafe if ALTER TABLE was used. Now it prints it only if the log does show the problem, i.e. ALTER TABLE or CREATE SELECT was used (both disable logging of REDO_INSERT* as those records are not needed for recovery; those missing records in turn make recreation-from-scratch, via maria_read_log, impossible). For that, when ha_maria::external_lock() disables transactionality, _ma_tmp_disable_logging_for_table() writes a LOGREC_INCOMPLETE_LOG to the log, which maria_apply_log() picks up to write a warning. storage/maria/ma_recovery.h: maria_apply_log() returns a count of warnings storage/maria/maria_def.h: _ma_tmp_disable_logging_for_table() grows so becomes a function storage/maria/maria_read_log.c: maria_apply_log can now return a count of warnings, to temper the "SUCCESS" message printed in the end by maria_read_log. Advise users to make a backup first.
34 lines
1.3 KiB
C
34 lines
1.3 KiB
C
/* Copyright (C) 2006,2007 MySQL AB
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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WL#3072 Maria recovery
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First version written by Guilhem Bichot on 2006-04-27.
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Does not compile yet.
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*/
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/* This is the interface of this module. */
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/* Performs recovery of the engine at start */
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C_MODE_START
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enum maria_apply_log_way
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{ MARIA_LOG_APPLY, MARIA_LOG_DISPLAY_HEADER, MARIA_LOG_CHECK };
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int maria_recover(void);
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int maria_apply_log(LSN lsn, enum maria_apply_log_way apply,
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FILE *trace_file,
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my_bool execute_undo_phase, my_bool skip_DDLs,
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my_bool take_checkpoints, uint *warnings_count);
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C_MODE_END
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