ndb_redo_log_reader — Check and Print Content of Cluster Redo Log 23.4.22 ndb_redo_log_reader — Check and Print Content of Cluster Redo Log 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 Usage 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 4362 Format Description Added, Deprecated, or Removed -dump Print dump info (Supported in all NDB releases based on MySQL 8.0) -filedescriptors Print file descriptors only (Supported in all NDB releases based on MySQL 8.0) --help Print usage information (Supported in all NDB releases based on MySQL 8.0) -lap Provide lap info, with max GCI started and completed (Supported in all NDB releases based on MySQL 8.0) -mbyte # Starting megabyte (Supported in all NDB releases based on MySQL 8.0) -mbyteheaders Show only first page header of each megabyte in file (Supported in all NDB releases based on MySQL 8.0) -nocheck Do not check records for errors (Supported in all NDB releases based on MySQL 8.0) -noprint Do not print records (Supported in all NDB releases based on MySQL 8.0) -page # Start with this page (Supported in all NDB releases based on MySQL 8.0) -pageheaders Show page headers only (Supported in all NDB releases based on MySQL 8.0) -pageindex # Start with this page index (Supported in all NDB releases based on MySQL 8.0) -twiddle Bit-shifted dump (Supported in all NDB releases based on MySQL 8.0)