Help Center/ GaussDB/ Distributed_8.x/ Schemas/ DBE_PERF Schema/ Utility/ GLOBAL_DOUBLE_WRITE_STATUS

Updated on 2024-06-03 GMT+08:00

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GLOBAL_DOUBLE_WRITE_STATUS

GLOBAL_DOUBLE_WRITE_STATUS displays the information about doublewrite files of all instances in the entire cluster, as described in Table 1.

**Table 1** GLOBAL_DOUBLE_WRITE_STATUS columns
Name	Type	Description
node_name	text	Instance name.
curr_dwn	bigint	Sequence number of the doublewrite file.
curr_start_page	bigint	Start page for restoring the doublewrite file.
file_trunc_num	bigint	Number of times that the doublewrite file is reused.
file_reset_num	bigint	Number of reset times after the doublewrite file is full.
total_writes	bigint	Total number of I/Os of the doublewrite file.
low_threshold_writes	bigint	Number of I/Os for writing doublewrite files with low efficiency (the number of I/O flushing pages at a time is less than 16).
high_threshold_writes	bigint	Number of I/Os for writing doublewrite files with high efficiency (the number of I/O flushing pages at a time is more than 421).
total_pages	bigint	Total number of pages that are flushed to the doublewrite file area.
low_threshold_pages	bigint	Number of pages that are flushed with low efficiency.
high_threshold_pages	bigint	Number of pages that are flushed with high efficiency.
file_id	bigint	ID of the current doublewrite file.