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PostgreSQL pg_stat_activity status

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Active: query is running and session is hitting every threshold time,
Idle in transaction: query is completed,and waiting for commit, session is hitting every threshold period.
Idle in transaction (aborted): last or some statement was aborted due to network or syntax error (consider here some statement executed succefully but some one only got issue),Similar to idle in transaction, except one of the statements in the transaction caused an error.
Idle: session timeout and query executed and query has been committed
Disabled:If track activities is disabled in this backend.
Note:
So Before​ closing session you have to issue commit otherwise work_mem will not release that particular session

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