Using CSV Log Output

Prerequisites

The log_destination parameter is set to csvlog.
The logging_collector parameter is set to on.

Definition of csvlog

Log lines are emitted in comma separated values (CSV) format.

An example table definition for storing CSV-format log output is shown as follows:

     
      
        
        
          CREATE TABLE gaussdb_log
(
log_time timestamp(3) with time zone,
node_name text,
user_name text,
database_name text,
process_id bigint,
connection_from text,
"session_id" text,
session_line_num bigint,
command_tag text,
session_start_time timestamp with time zone,
virtual_transaction_id text,
transaction_id bigint,
query_id bigint,
module text,
error_severity text,
sql_state_code text,
message text,
detail text,
hint text,
internal_query text,
internal_query_pos integer,
context text,
query text,
query_pos integer,
location text,
application_name text
);

         

       

     
    

For details, see Table 1.

**Table 1** Meaning of each csvlog field
Field	Description	Field	Description
log_time	Timestamp in milliseconds	module	Log module
node_name	Node name	error_severity	ERRORSTATE code
user_name	Username	sql_state_code	SQLSTATE code
database_name	Database name	message	Error message
process_id	Thread ID	detail	Detailed error message
connection_from	Port number of the client host	hint	Prompt message
session_id	Session ID	internal_query	Internal query (This field is used to query the information leading to errors if any.)
session_line_num	Number of lines in each session	internal_query_pos	Pointer for an internal query
command_tag	Command tag	context	Environment
session_start_time	Start time of a session	query	Character count at the position where errors occur
virtual_transaction_id	Regular transaction	query_pos	Pointer at the position where errors occur
transaction_id	Transaction ID	location	Position where errors occur in the GaussDB source code if log_error_verbosity is set to verbose.
query_id	Query ID	application_name	Application name

Run the COPY FROM command to import a log file to this table.

     
          COPY postgres_log FROM '/opt/data/gs_log/logfile.csv' WITH csv;

The log name (logfile.csv) here needs to be replaced with the name of a log generated.

Simplifying Input

Simplify importing CSV log files by performing the following operations:

Set log_filename and log_rotation_age to provide a consistent, predictable naming solution for log files. By doing this, you can predict when an individual log file is complete and ready to be imported.
Set log_rotation_size to 0 to disable size-based log rollback, as it makes the log file name difficult to predict.
Set log_truncate_on_rotation to on so that old log data cannot be mixed with the new one in the same file.