PostgreSQL 临时表空间的实现

CREATE TABLESPACE temp_space LOCATION '/path/to/temp_directory';

ALTER DATABASE your_database SET temp_tablespaces = 'temp_space';

SELECT * FROM pg_tablespace;

DROP TABLESPACE temp_space;

-- 设置多个临时表空间（PostgreSQL会按顺序使用）
ALTER SYSTEM SET temp_tablespaces = 'temp_space1, temp_space2';

ALTER SYSTEM SET temp_buffers = '64MB';

ALTER SYSTEM SET work_mem = '16MB';

SELECT 
    pg_stat_get_activity(pid) AS query,
    temp_files,
    temp_bytes
FROM pg_stat_database;

SELECT * FROM pg_stat_activity WHERE pid = pg_backend_pid();

SELECT 
    ts.spcname AS tablespace,
    pg_size_pretty(pg_tablespace_size(ts.oid)) AS size
FROM pg_tablespace ts;

-- 增加临时表空间大小（通过增加存储空间）
-- 或添加新的临时表空间目录
CREATE TABLESPACE temp_space2 LOCATION '/another/temp/dir';
ALTER DATABASE your_db SET temp_tablespaces = 'temp_space, temp_space2';

-- 增加work_mem减少临时文件使用
ALTER SYSTEM SET work_mem = '32MB';

-- 将临时表空间移到更快的存储设备

SELECT 
    query,
    temp_files,
    temp_bytes
FROM pg_stat_statements
ORDER BY temp_bytes DESC
LIMIT 10;