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ndb_redo_log_reader − check and print content of cluster redo log


ndb_redo_log_reader file_name [options]


Reads a redo log file, checking it for errors, printing its contents in a human−readable format, or both. ndb_redo_log_reader is intended for use primarily by NDB Cluster developers and Support personnel in debugging and diagnosing problems.

This utility remains under development, and its syntax and behavior are subject to change in future NDB Cluster releases.

The C++ source files for ndb_redo_log_reader can be found in the directory /storage/ndb/src/kernel/blocks/dblqh/redoLogReader.

Options that can be used with ndb_redo_log_reader are shown in the following table. Additional descriptions follow the table.

Table 23.40. Command−line options used with the program ndb_redo_log_reader

ndb_redo_log_reader file_name [options]

file_name is the name of a cluster redo log file. redo log files are located in the numbered directories under the data node's data directory (DataDir); the path under this directory to the redo log files matches the pattern ndb_nodeid_fs/D#/DBLQH/S#.FragLog. nodeid is the data node's node ID. The two instances of # each represent a number (not necessarily the same number); the number following D is in the range 8−39 inclusive; the range of the number following S varies according to the value of the NoOfFragmentLogFiles configuration parameter, whose default value is 16; thus, the default range of the number in the file name is 0−15 inclusive. For more information, see NDB Cluster Data Node File System Directory [1] .

The name of the file to be read may be followed by one or more of the options listed here:


Print dump info.

−filedescriptors: Print file descriptors only.

−−help: Print usage information.


Provide lap info, with max GCI started and completed.

−mbyte #: Starting megabyte.

# is an integer in the range 0 to 15, inclusive.

−mbyteheaders: Show only the first page header of every megabyte in the file.

−noprint: Do not print the contents of the log file.

−nocheck: Do not check the log file for errors.

−page #: Start at this page.

# is an integer in the range 0 to 31, inclusive.

−pageheaders: Show page headers only.

−pageindex #: Start at this page index.

# is an integer between 12 and 8191, inclusive.


Bit−shifted dump.

Like ndb_print_backup_file and ndb_print_schema_file (and unlike most of the NDB utilities that are intended to be run on a management server host or to connect to a management server) ndb_redo_log_reader must be run on a cluster data node, since it accesses the data node file system directly. Because it does not make use of the management server, this utility can be used when the management server is not running, and even when the cluster has been completely shut down.


Copyright © 1997, 2021, Oracle and/or its affiliates.

This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.



NDB Cluster Data Node File System Directory



For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/.


Oracle Corporation (http://dev.mysql.com/).