Viewing Slow Query Logs of RDS for PostgreSQL DB Instances

Scenarios

Slow query logs record statements that exceed the log_min_duration_statement value (1 second by default). You can view log details and statistics to identify statements that are slowly executed and optimize the statements. RDS for PostgreSQL supports the following statement types:

SELECT
INSERT
UPDATE
DELETE
CREATE
DROP
ALTER
DO
CALL
COPY

Parameter Description

**Table 1** Parameters related to RDS for PostgreSQL slow queries
Parameter	Description
log_min_duration_statement	Specifies the minimum execution time. The statements whose execution time is greater than or equal to the value of this parameter are recorded. If this parameter is set to a smaller value, the number of log records increases, which increases the disk I/O and deteriorates the SQL performance.
log_statement	Specifies the statement type. The value can be none, ddl, mod, or all. The default value is none. If you change the value to all: The database disk I/O increases, and the SQL performance deteriorates. The log format changes, and you cannot view slow query logs on the console.
log_statement_stats	Specifies whether to output performance statistics to server logs. The default value is off. If you change the value to on: The database disk I/O increases, and the SQL performance deteriorates. The log format changes, and you cannot view slow query logs on the console.

Procedure

Log in to the management console.
Click in the upper left corner and select a region and a project.
Click in the upper left corner of the page and choose Databases > Relational Database Service.
On the Instances page, click the target DB instance.
In the navigation pane on the left, choose Logs. On the Slow Query Logs page, click Log Details.
You can view the slow query log records of a specified statement type in a specified time period.