Hi, Would you like to be so kind as to answer the following questions: - Is there any way to control the number of clog files and xlog files? I encounter an issue that there are too many clog files under the pg_clog/ directory which occupy more space than I can endure.. - What determines the number of clog files? what determines the number of xlog files? - I understand pg_xlog is used to record WAL. but what is pg_clog is used to? Is it used to record some meta-information on the xlog? Best regards Gera