gp_suboverflowed_backend
gp_suboverflowed_backend 视图允许管理员识别后端发生子事务溢出的会话，这可能导致系统中查询性能下降，包括目录查询。
| 列 | 类型 | 描述 |
|---|---|---|
segid | integer | 包含子事务溢出后端的 Segment ID。 |
pids | integer[] | 此 Segment 上所有子事务溢出后端的进程 ID 列表。 |
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