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## 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 

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## 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 

