PostgreSQL打印实时查询语句的三种方法

# 开启日志记录所有 SQL 语句
log_statement = 'all'

# 设置日志输出格式（推荐包含时间、进程 ID 等）
log_line_prefix = '%t [%p]: [user=%u,db=%d] '

# 开启日志收集器
logging_collector = on
log_directory = '/var/log/postgresql'
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'

docker compose down
docker compose up -d

# 方法 1：通过 docker logs 实时查看
docker compose logs -f postgres

# 方法 2：直接访问宿主机日志目录（假设日志挂载到 ./logs）
tail -f ./logs/postgresql-*.log

2025-09-07 16:24:38.123 UTC [1234]: [user=postgres,db=postgres] LOG:  statement: SELECT * FROM my_table;

SELECT 
    pid, 
    usename, 
    query, 
    query_start, 
    now() - query_start AS duration
FROM 
    pg_stat_activity
WHERE 
    state = 'active' 
    AND query != '<IDLE>'
ORDER BY 
    query_start DESC;

watch -n 1 "psql -U postgres -d postgres -c 'SELECT * FROM pg_stat_activity;'"

shared_preload_libraries = 'pg_stat_statements'
pg_stat_statements.track = all

CREATE EXTENSION pg_stat_statements;

SELECT 
    query, 
    calls, 
    total_exec_time, 
    mean_exec_time
FROM 
    pg_stat_statements
ORDER BY 
    total_exec_time DESC
LIMIT 10;