mysqld_safe — MySQL Server Startup Script Write the error log to the given file. See Section 5.4.2, “The Error Log” . This option controls the format for timestamps in log output produced by  mysqld_safe . The following list describes the permitted values. For any other value,  mysqld_safe  logs a warning and uses  UTC format. ISO 8601 UTC format (same as  --log_timestamps=UTC  for the server). This is the default. ISO 8601 local time format (same as  --log_timestamps=SYSTEM  for the server). YY-MM-DD h:mm:ss  format, as in  mysqld_safe  for MySQL 5.6. YYMMDD hh:mm:ss  format, as in  mysqld_safe  prior to MySQL 5.6. The name of the library to use for memory allocation instead of the system  malloc()  library. The option value must be one of the directories  /usr/lib ,  /usr/lib64 ,  /usr/lib/i386-linux-gnu , or  / usr/lib/x86_64-linux-gnu . The  --malloc-lib  option works by modifying the  LD_PRELOAD  environment value to affect dynamic linking to enable the loader to find the memory-allocation library when  mysqld  runs: As of MySQL 8.0.21,  tcmalloc  is not a permitted value for the  --malloc-lib  option. On systems that manage the server using systemd,  mysqld_safe  is not available. Instead, specify the allocation library by setting  LD_PRELOAD  in  /etc/ sysconfig/mysql . Linux users can use the  libtcmalloc_minimal.so  library on any platform for which a  tcmalloc package is installed in  /usr/lib  by adding these lines to the  my.cnf  file: • --mysqld-safe-log-timestamps • UTC ,  utc • SYSTEM ,  system • HYPHEN ,  hyphen • LEGACY ,  legacy • --malloc-lib=[ lib_name ] •If the option is not given, or is given without a value ( --malloc-lib= ),  LD_PRELOAD  is not modified and no attempt is made to use  tcmalloc . •Prior to MySQL 8.0.21, if the option is given as  --malloc-lib=tcmalloc ,  mysqld_safe  looks for a  tcmalloc  library in  /usr/lib . If  tmalloc  is found, its path name is added to the beginning of the LD_PRELOAD  value for  mysqld . If  tcmalloc  is not found,  mysqld_safe  aborts with an error. •If the option is given as  --malloc-lib= /path/to/some/library , that full path is added to the beginning of the  LD_PRELOAD  value. If the full path points to a nonexistent or unreadable file, mysqld_safe  aborts with an error. •For cases where  mysqld_safe  adds a path name to  LD_PRELOAD , it adds the path to the beginning of any existing value the variable already has. Note 385