SELECT
variable_name,
variable_value/1024/1024 AS size_mb
FROM performance_schema.global_status
WHERE variable_name IN ('Innodb_buffer_pool_bytes_data',
'Innodb_buffer_pool_bytes_dirty');
| Problem | Likely cause | Fix |
|---------|--------------|-----|
| Sudden slow writes | Redo log too small | Increase innodb_log_file_size (MySQL 8.0: dynamic resize) |
| Table seems “stuck” | Long-running transaction holding undo | Find and kill it via information_schema.innodb_trx |
| Excessive disk I/O | Buffer pool too small | Increase innodb_buffer_pool_size |
| High deadlock rate | Different access orders | Standardize query access patterns in app code |
Cause: The partitioned AHI and secondary buffer pools consume more RAM than the legacy single hash.
Solution: Reduce innodb_adaptive_hash_index_parts to 8 (from 16) and ensure innodb_buffer_pool_size is set to no more than 70% of system RAM to leave room for OS page cache. indodb21
Every InnoDB table is a clustered index – the primary key organizes the actual data rows. | Problem | Likely cause | Fix |
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