MariaDB ColumnStore Utility Functions are a set of simple functions that return useful information about the system, such as whether it is ready for queries. These functions were added in version 1.1.3.
| Function | Description |
|---|---|
| mcsSystemReady() | Returns 1 if the system can accept queries, 0 if it's not ready yet. |
| mcsSystemReadOnly() | Returns 1 if ColumnStore is in a writes suspended mode. That is, a user executed the SuspendDatabaseWrites.It returns 2 if in a read only state. ColumnStore puts itself into a read only state if it detects a logic error that may have corrupted data. Generally it means a ROLLBACK operation failed. Returns 0 if the system is writable. |
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https://mariadb.com/kb/en/columnstore-utility-functions/