Constraints on the Resource Pooling Architecture

Description

openGauss resource pooling is a new cluster architecture launched by openGauss. The DMS and DSS components are used to implement underlying shared storage among multiple nodes in a cluster and real-time memory sharing among nodes. In this way, underlying storage resources are saved, write-once-read-many is supported in a cluster, and real-time consistent read is supported. This document describes the constraints on the resource pooling architecture.

Current Constraints

  • Note that these are temporary constraints and the features may be supported in the future.
No.ConstraintRemarks
1Only segment-page storage is supported. Page-based storage is not supported.The table creation statement must contain with (segment = on, xxx).
2Row-store tables are not supported.None
3FDW is not supported.None
4Unlogged tables are not supported.None
5Local temporary tables and global temporary tables are not supported.None
6Features with compression are not supported.None
7Materialized views are not supported.None
8The standby node does not support the operation of starting a transaction.None
9XA transactions are not supported.None
10When the OM is used for installation, only disk array deployment is supported. Ceph and virtual storage pools are not supported.None
11Publication and subscription are not supported.None
12The traditional primary/standby architecture cannot be deployed at the same time.That is, a cluster cannot use both the resource pooling primary/standby mode and the traditional primary/standby mode. That is, the replconninfo or hot_standby parameter is not supported.
13Ustore is not supported.Flashback is not supported because flashback supports only Ustore.
14The size of a single Xlog file is changed from 16 MB to 1 GB.The recycling mechanism is also adapted to 1 GB, and the pg_xlogdump tool is also adapted.
15You are not advised to disable Global SysCache.This function is enabled by default and can be disabled through a configuration item. After this function is disabled, the connection may slow down in the case of high concurrency.
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    openGauss 2024-10-08 01:19:39
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