Undo
undo_space_limit_size
Parameter description: Specifies the threshold for forcibly recycling undo space. When the undo space usage reaches 80% of the threshold, forcible recycling starts. You can set this parameter to a large value based on service requirements and then set it to a proper value based on the actual undo space usage.
This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.
Value range: an integer ranging from 800 MB to 16 TB
Default value: 256GB
undo_limit_size_per_transaction
Parameter description: Specifies the undo space threshold of a single transaction. If the threshold is reached, the transaction is rolled back due to an error.
This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.
Value range: an integer ranging from 2 MB to 16 TB
Default value: 32 GB
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