如何使用PostgreSQL查询获取机器的内存详细信息？

要查询机器的内存详细信息，可以使用PostgreSQL的pg_stat_bgwriter视图和pg_stat_progress_vacuum视图。

首先，使用以下查询获取机器的内存总量和可用内存：

SELECT
    pg_size_pretty(pg_stat_bgwriter.shared_buffers * current_setting('block_size')::int8) AS shared_buffers,
    pg_size_pretty(pg_stat_bgwriter.temp_buffers * current_setting('block_size')::int8) AS temp_buffers,
    pg_size_pretty(pg_stat_bgwriter.maxwritten_clean * current_setting('block_size')::int8) AS maxwritten_clean,
    pg_size_pretty(pg_stat_bgwriter.buf_written * current_setting('block_size')::int8) AS buf_written,
    pg_size_pretty(pg_stat_bgwriter.buf_fsync * current_setting('block_size')::int8) AS buf_fsync,
    pg_size_pretty(pg_stat_bgwriter.buf_alloc * current_setting('block_size')::int8) AS buf_alloc,
    pg_size_pretty(pg_stat_bgwriter.checkpoint_write_time) AS checkpoint_write_time,
    pg_size_pretty(pg_stat_bgwriter.checkpoint_sync_time) AS checkpoint_sync_time,
    pg_size_pretty(pg_stat_bgwriter.buf_checkpoint) AS buf_checkpoint,
    pg_size_pretty(pg_stat_bgwriter.buf_clean) AS buf_clean,
    pg_size_pretty(pg_stat_bgwriter.backend_flush_requested * current_setting('block_size')::int8) AS backend_flush_requested,
    pg_size_pretty(pg_stat_bgwriter.backend_flush_avg_duration) AS backend_flush_avg_duration,
    pg_size_pretty(pg_stat_bgwriter.backend_flush_max_duration) AS backend_flush_max_duration,
    pg_size_pretty(pg_stat_bgwriter.backend_flush_samples) AS backend_flush_samples,
    pg_size_pretty(pg_stat_bgwriter.bgwriter_delay) AS bgwriter_delay,
    pg_size_pretty(pg_stat_bgwriter.bgwriter_lru_multiplier) AS bgwriter_lru_multiplier,
    pg_stat_bgwriter.stats_reset AS stats_reset
FROM
    pg_stat_bgwriter;

该查询将返回包括共享缓冲区、临时缓冲区、已写入的最大块数、写入磁盘的块数、写入磁盘后同步到磁盘的块数、已分配的缓冲区、检查点写入时间、检查点同步时间、检查点期间写入磁盘的块数、清理的缓冲区、后台进程请求的写入磁盘的块数、后台进程写入时间的平均值、后台进程写入时间的最大值、后台进程写入时间的样本数、后台进程的延迟、后台进程的LRU倍增因子以及统计重置时间等详细信息。

其次，使用以下查询获取机器上正在进行的VACUUM操作的进度信息：

SELECT
    pid,
    datname,
    phase,
    heap_blks_total,
    heap_blks_scanned,
    heap_blks_vacuumed,
    index_vacuum_count,
    max_dead_tuples,
    num_dead_tuples,
    tup_del_count,
    tup_upd_count,
    tup_hot_upd_count,
    tup_ins_count,
    vacuum_time
FROM
    pg_stat_progress_vacuum;

该查询将返回正在进行VACUUM操作的进程的ID、数据库名称、当前阶段、扫描的堆块数、清理的堆块数、索引清理次数、最大死元组数、当前死元组数、删除的元组数、更新的元组数、热更新的元组数、插入的元组数以及VACUUM操作所花费的时间。

这些查询将提供机器内存的详细信息，以帮助您优化和监控数据库性能。

对于腾讯云的相关产品和介绍链接，很遗憾，我无法提供与特定云计算品牌商相关的信息。您可以自行搜索相关云服务提供商的文档或支持页面，以获取与PostgreSQL查询机器内存相关的信息。