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==== Description ====
Flashback can rollback the instances/databases/tables to an old snapshot.
It's implement on Server-Level by full image format binary logs (--binlog-row-image=FULL), so it supports all engines.
Currently, it’s a feature inside mysqlbinlog tool (with --flashback arguments).
Because the flashback binlog events will store in the memory, you should check if there is enough memory in your machine.
==== New Arguments to mysqlbinlog ====
--flashback (-B)
It will let mysqlbinlog to work on FLASHBACK mode.
==== New Arguments to mysqld ====
--flashback
Setup the server to use flashback. This enables binary log in row mode
and will enable extra logging for DDL's needed by flashback feature
==== Example ====
I have a table "t" in database "test", we can compare the output with "--flashback" and without.
#client/mysqlbinlog /data/mysqldata_10.0/binlog/mysql-bin.000001 -vv -d test -T t --start-datetime="2013-03-27 14:54:00" > /tmp/1.sql
#client/mysqlbinlog /data/mysqldata_10.0/binlog/mysql-bin.000001 -vv -d test -T t --start-datetime="2013-03-27 14:54:00" -B > /tmp/2.sql
Then, importing the output flashback file (/tmp/2.log), it can flashback your database/table to the special time (--start-datetime).
And if you know the exact postion, "--start-postion" is also works, mysqlbinlog will output the flashback logs that can flashback to "--start-postion" position.
==== Implement ====
1. As we know, if binlog_format is ROW (binlog-row-image=FULL in 10.1 and later), all columns value are store in the row event, so we can get the data before mis-operation.
2. Just do following things:
2.1 Change Event Type, INSERT->DELETE, DELETE->INSERT.
For example:
INSERT INTO t VALUES (...) ---> DELETE FROM t WHERE ...
DELETE FROM t ... ---> INSERT INTO t VALUES (...)
2.2 For Update_Event, swapping the SET part and WHERE part.
For example:
UPDATE t SET cols1 = vals1 WHERE cols2 = vals2
--->
UPDATE t SET cols2 = vals2 WHERE cols1 = vals1
2.3 For Multi-Rows Event, reverse the rows sequence, from the last row to the first row.
For example:
DELETE FROM t WHERE id=1; DELETE FROM t WHERE id=2; ...; DELETE FROM t WHERE id=n;
--->
DELETE FROM t WHERE id=n; ...; DELETE FROM t WHERE id=2; DELETE FROM t WHERE id=1;
2.4 Output those events from the last one to the first one which mis-operation happened.
For example:
123 lines
4 KiB
C
123 lines
4 KiB
C
/*
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Copyright (c) 2001, 2012, Oracle and/or its affiliates.
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Copyright (c) 2009, 2016, MariaDB
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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 02110-1301 USA
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*/
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/* Common defines for all clients */
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#include <my_global.h>
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#include <my_sys.h>
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#include <m_string.h>
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#include <mysql.h>
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#include <errmsg.h>
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#include <my_getopt.h>
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#include <mysql_version.h>
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#ifndef WEXITSTATUS
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# ifdef __WIN__
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# define WEXITSTATUS(stat_val) (stat_val)
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# else
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# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
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# endif
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#endif
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enum options_client
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{
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OPT_CHARSETS_DIR=256, OPT_DEFAULT_CHARSET,
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OPT_PAGER, OPT_TEE,
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OPT_LOW_PRIORITY, OPT_AUTO_REPAIR, OPT_COMPRESS,
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OPT_DROP, OPT_LOCKS, OPT_KEYWORDS, OPT_DELAYED, OPT_OPTIMIZE,
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OPT_FTB, OPT_LTB, OPT_ENC, OPT_O_ENC, OPT_ESC, OPT_TABLES,
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OPT_MASTER_DATA, OPT_AUTOCOMMIT, OPT_AUTO_REHASH,
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OPT_LINE_NUMBERS, OPT_COLUMN_NAMES, OPT_CONNECT_TIMEOUT,
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OPT_MAX_ALLOWED_PACKET, OPT_NET_BUFFER_LENGTH,
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OPT_SELECT_LIMIT, OPT_MAX_JOIN_SIZE, OPT_SSL_SSL,
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OPT_SSL_KEY, OPT_SSL_CERT, OPT_SSL_CA, OPT_SSL_CAPATH,
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OPT_SSL_CIPHER, OPT_SHUTDOWN_TIMEOUT, OPT_LOCAL_INFILE,
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OPT_DELETE_MASTER_LOGS, OPT_COMPACT,
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OPT_PROMPT, OPT_IGN_LINES,OPT_TRANSACTION,OPT_MYSQL_PROTOCOL,
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OPT_SHARED_MEMORY_BASE_NAME, OPT_FRM, OPT_SKIP_OPTIMIZATION,
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OPT_COMPATIBLE, OPT_RECONNECT, OPT_DELIMITER, OPT_SECURE_AUTH,
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OPT_OPEN_FILES_LIMIT, OPT_SET_CHARSET, OPT_SERVER_ARG,
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OPT_STOP_POSITION, OPT_START_DATETIME, OPT_STOP_DATETIME,
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OPT_SIGINT_IGNORE, OPT_HEXBLOB, OPT_ORDER_BY_PRIMARY, OPT_COUNT,
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OPT_FLUSH_TABLES,
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OPT_TRIGGERS,
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OPT_MYSQL_ONLY_PRINT,
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OPT_MYSQL_LOCK_DIRECTORY,
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OPT_USE_THREADS,
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OPT_IMPORT_USE_THREADS,
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OPT_MYSQL_NUMBER_OF_QUERY,
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OPT_IGNORE_TABLE,OPT_INSERT_IGNORE,OPT_SHOW_WARNINGS,OPT_DROP_DATABASE,
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OPT_TZ_UTC, OPT_CREATE_SLAP_SCHEMA,
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OPT_MYSQLDUMP_SLAVE_APPLY,
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OPT_MYSQLDUMP_SLAVE_DATA,
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OPT_MYSQLDUMP_INCLUDE_MASTER_HOST_PORT,
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#ifdef WHEN_FLASHBACK_REVIEW_READY
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OPT_REVIEW,
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OPT_REVIEW_DBNAME, OPT_REVIEW_TABLENAME,
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#endif
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OPT_SLAP_CSV, OPT_SLAP_CREATE_STRING,
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OPT_SLAP_AUTO_GENERATE_SQL_LOAD_TYPE, OPT_SLAP_AUTO_GENERATE_WRITE_NUM,
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OPT_SLAP_AUTO_GENERATE_ADD_AUTO,
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OPT_SLAP_AUTO_GENERATE_GUID_PRIMARY,
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OPT_SLAP_AUTO_GENERATE_EXECUTE_QUERIES,
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OPT_SLAP_AUTO_GENERATE_SECONDARY_INDEXES,
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OPT_SLAP_AUTO_GENERATE_UNIQUE_WRITE_NUM,
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OPT_SLAP_AUTO_GENERATE_UNIQUE_QUERY_NUM,
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OPT_SLAP_PRE_QUERY,
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OPT_SLAP_POST_QUERY,
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OPT_SLAP_PRE_SYSTEM,
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OPT_SLAP_POST_SYSTEM,
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OPT_SLAP_COMMIT,
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OPT_SLAP_DETACH,
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OPT_SLAP_NO_DROP,
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OPT_MYSQL_REPLACE_INTO, OPT_BASE64_OUTPUT_MODE, OPT_SERVER_ID,
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OPT_FIX_TABLE_NAMES, OPT_FIX_DB_NAMES, OPT_SSL_VERIFY_SERVER_CERT,
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OPT_AUTO_VERTICAL_OUTPUT,
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OPT_DEBUG_INFO, OPT_DEBUG_CHECK, OPT_COLUMN_TYPES, OPT_ERROR_LOG_FILE,
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OPT_WRITE_BINLOG, OPT_DUMP_DATE,
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OPT_INIT_COMMAND,
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OPT_PLUGIN_DIR,
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OPT_DEFAULT_AUTH,
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OPT_ABORT_SOURCE_ON_ERROR,
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OPT_REWRITE_DB,
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OPT_REPORT_PROGRESS,
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OPT_SKIP_ANNOTATE_ROWS_EVENTS,
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OPT_SSL_CRL, OPT_SSL_CRLPATH,
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OPT_MAX_CLIENT_OPTION /* should be always the last */
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};
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/**
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First mysql version supporting the information schema.
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*/
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#define FIRST_INFORMATION_SCHEMA_VERSION 50003
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/**
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Name of the information schema database.
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*/
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#define INFORMATION_SCHEMA_DB_NAME "information_schema"
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/**
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First mysql version supporting the performance schema.
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*/
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#define FIRST_PERFORMANCE_SCHEMA_VERSION 50503
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/**
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Name of the performance schema database.
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*/
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#define PERFORMANCE_SCHEMA_DB_NAME "performance_schema"
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