gp_id 系统目录表位于 pg_catalog 模式中，用于标识 Apache Cloudberry 系统的名称和 Segment 数量。它还包含该表所在的特定数据库实例（Segment 或 Coordinator）的本地信息。该表定义在 pg_global 表空间中，意味着它在系统的所有数据库中全局共享。
| 列名 | 类型 | 引用 | 描述 |
|---|---|---|---|
gpname | name | 当前 Apache Cloudberry 系统的名称。 | |
numsegments | smallint | Apache Cloudberry 系统中的 Segment 数量。 | |
dbid | smallint | 当前 Segment（或 Coordinator）实例的唯一标识符。 | |
content | smallint | 当前 Segment 实例上数据部分的 ID。主 Segment 和其镜像会共享相同的 content ID。 对于 Segment，值的范围为 0 到 N-1，其中 N 是 Apache Cloudberry 系统中的 Segment 数量。 对于 Coordinator，值为 -1。 |
Apache Cloudberry is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
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