Hi!
Sometimes duplicate key error
duplicate key value violates unique constraint "session_pkey"
Key (workplace)=(WIN-N9BSKUNKBC8 ) already exists.
occurs in script:
delete from session where workplace='WIN-N9BSKUNKBC8' ;
INSERT INTO session (workplace,ipaddress,logintime,loggeduser)
SELECT 'WIN-N9BSKUNKBC8' ,
inet_client_addr()::CHAR(14),current_timestamp::CHAR(28),CURRENT_USER
WHERE NOT EXISTS (SELECT 1 FROM session WHERE
workplace='WIN-N9BSKUNKBC8' )
Sript is running form windows task scheduler on every 10 minutes.
Error occurs only sometimes.
How to fix this ?
Table is defined as
CREATE TABLE public.session
(
loggeduser character(10) ,
workplace character(16) NOT NULL,
ipaddress character(20) ,
logintime character(28) ,
activity timestamp with time zone,
CONSTRAINT session_pkey PRIMARY KEY (workplace)
)
Environment:
PostgreSQL 13.1, compiled by Visual C++ build 1914, 64-bit
Windows server 2019
psqlODBC driver 13.00.0000
I already asked this in this list many years ago. In this case Tom replies that is looks like index race condition bug which was fixed in later Postgres 9 version.
However this issue still exists in Postgres 13.1
Andrus.
