[MDEV-25687] trx_active_transactions is inconsistent and a potential performance hog; remove it - Jira

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Type: Bug
Status: Closed (View Workflow)
Priority: Major
Resolution: Fixed
Affects Version/s: 10.0(EOL), 10.1(EOL), 10.2(EOL), 10.3(EOL), 10.4(EOL), 10.5, 10.6
Fix Version/s: 10.6.1
Component/s: Storage Engine - InnoDB
Labels:
- corruption
- performance

Description

The counter MONITOR_TRX_ACTIVE is not being updated consistently; see MySQL Bug #73114.

Furthermore, the count aims to include non-locking read-only transactions, which are otherwise mostly invisible to other threads, for performance reasons. The more interesting transactions can be found by reading information_schema.innodb_trx.

If it later turns out that a reliable count of active transactions is needed, it can be implemented via a different interface later.

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Issue Links

relates to

MDEV-25689 metadata_table_reference_count, metadata_table_handles_closed are updated inconsistently; remove them

Closed

MDEV-15706 Remove information_schema.innodb_metrics, innodb_monitor_enable, innodb_monitor_disable

Open

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Assignee:: Marko Mäkelä

Reporter:: Marko Mäkelä

Votes:: 0 Vote for this issue

Watchers:: 1 Start watching this issue

Dates

Created:: 2021-05-17 05:36

Updated:: 2021-05-17 06:55

Resolved:: 2021-05-17 05:42

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