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MDEV-27917 Some redo log diagnostics is always reported as 0

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The InnoDB monitor counter log_sys.n_log_ios was almost removed
in commit 685d958e38 (MDEV-14425).
This counter was rather meaningless already since
commit 30ea63b7d2
introduced a redo log group commit mechanism, and on the persistent
memory interface there are no file system calls that could be counted.

The only case when log_sys.n_log_ios was updated is when the log file
was being read during crash recovery.

Some related output in log_print() as well as the
information_schema.innodb_metrics counter log_num_log_io are best removed.
This commit is contained in:
Marko Mäkelä
2022-02-22 18:56:21 +02:00
parent 30b036d729
commit 934b2d605e
9 changed files with 0 additions and 70 deletions
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mysql-test/suite/innodb/r/innodb_skip_innodb_is_tables.result
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@ -180,7 +180,6 @@ log_lsn_current recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0
log_lsn_checkpoint_age recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 value Current LSN value minus LSN at last checkpoint
log_lsn_buf_pool_oldest recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 value The oldest modified block LSN in the buffer pool
log_max_modified_age_async recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 value Maximum LSN difference; when exceeded, start asynchronous preflush
log_num_log_io recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 value Number of log I/Os
log_waits recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 status_counter Number of log waits due to small log buffer (innodb_log_waits)
log_write_requests recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 status_counter Number of log write requests (innodb_log_write_requests)
log_writes recovery 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 status_counter Number of log writes (innodb_log_writes)