在docker上运行的Greenplum数据库服务占用大量磁盘空间

时间:2019-01-28 03:47:02

标签: docker greenplum

我有一个在docker上运行的greenplum数据库实例。表和索引中的数据很少(大约550 MB)。 我使用以下查询检查了所有表的大小:

SELECT *, pg_size_pretty(total_bytes) AS total
    , pg_size_pretty(index_bytes) AS INDEX
    , pg_size_pretty(toast_bytes) AS toast
    , pg_size_pretty(table_bytes) AS TABLE
  FROM (
  SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes FROM (
      SELECT c.oid,nspname AS table_schema, relname AS TABLE_NAME
              , c.reltuples AS row_estimate
              , pg_total_relation_size(c.oid) AS total_bytes
              , pg_total_relation_size(c.oid) - pg_relation_size(c.oid) AS index_bytes
              , pg_total_relation_size(reltoastrelid) AS toast_bytes
          FROM pg_class c
          LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
          WHERE relkind = 'r'
  ) a
) a
order by total_bytes desc

docker映像为4.7 GB。因此,此greenplum docker映像的近似用法为(4.7 + 0.5 ) = 5.2 GB。但是,docker容器占用了13GB磁盘空间。

磁盘使用情况如下:

[gpadmin@mdw ~]$ df -h
Filesystem                           Size  Used Avail Use% Mounted on
overlay                               17G   13G  4.7G  73% /
tmpfs                                2.0G     0  2.0G   0% /dev
tmpfs                                2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/mapper/centos_greenplum01-root   17G   13G  4.7G  73% /etc/hosts
shm                                   64M     0   64M   0% /dev/shm
tmpfs                                2.0G     0  2.0G   0% /proc/acpi
tmpfs                                2.0G     0  2.0G   0% /proc/scsi
tmpfs                                2.0G     0  2.0G   0% /sys/firmware

主机和docker都是CentOS。

作为测试我的应用程序的一部分,我一天中多次停止/启动Docker容器。

1 个答案:

答案 0 :(得分:0)

调试步骤以确定根本原因是docker还是greenplum。

登录docker:

cd /
df -schk *

反复检查最大的目录:

此问题的原因是/data/primary/gpseg1/pg_log中的日志文件很大。

我删除了所有超过2天的日志。

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