Preparation for dropping a storage space

Before you drop a dbspace, you must first drop all databases and tables that you previously created in that dbspace. You cannot drop the root dbspace.

Before you drop a blobspace, you must drop all tables that have a TEXT or BYTE column that references the blobspace.

Run oncheck -pe to verify that no tables or log files are located in the dbspace or blobspace.

Before you drop an sbspace, you must drop all tables that have a CLOB or BLOB column that reference objects that are stored in the sbspace. For sbspaces, you are not required to delete columns that point to an sbspace, but these columns must be null; that is, all smart large objects must be deallocated from the sbspace.
Tip: If you drop tables on dbspaces where light appends are occurring, the light appends might be slower than you expect. The symptom of this problem is physical logging activity. If light appends are slower than you expect, make sure that no tables are dropped in the dbspace either before or during the light appends. If you have dropped tables, force a checkpoint with onmode -c before you perform the light append.
Important: Dropping a chunk or a dbspace triggers a blocking checkpoint, which forces all database updates to wait while all the buffer pools are flushed to disk. This update blocking can be significantly longer during a blocking checkpoint than during a non-blocking checkpoint, especially if the buffer pool is large.

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