Gbase 8C backup control function (III)

pg_xlogfile_name(location text)

describe ： Convert the location string of the transaction log to a file name .

return type ：text

remarks ：pg_xlogfile_name Extract transaction log file names only . If the given transaction log location happens to be at the junction of the transaction log file , Both functions return the name of the previous transaction log file . This is very beneficial for managing transaction log archiving , Because the previous file is the last file that needs to be archived .

pg_xlogfile_name_offset(location text)

describe ： Converts the location string of the transaction log to the file name and returns the byte offset in the file .

return type ：text,integer

remarks ： have access to pg_xlogfile_name_offset Extract the corresponding transaction log file name and byte offset from the return result of the above function . for example ：

 gbase=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());

NOTICE:  WAL archiving is not enabled; you must ensure that all required WAL segments are copied through other means to complete the backup

        file_name         | file_offset

--------------------------+-------------

 000000010000000000000020 |        3616

(1 row)

pg_xlog_location_diff(location text, location text)

describe ： Calculate the difference in bytes between the two transaction log locations .

return type ：numeric

pg_cbm_tracked_location()

describe ： Used for query cbm Resolved to lsn Location .

return type ：text

pg_cbm_get_merged_file(startLSNArg text, endLSNArg text)

describe ： Used to specify lsn Within the scope of cbm Merge the files into one cbm file , And return the merged cbm file name .

return type ：text

remarks ： You must be a system administrator or operation and maintenance administrator to obtain cbm Merge files .