Adding note on performance_schema_max_digest_length #1153
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| @@ -206,6 +206,9 @@ To use *Performance Schema*, set the variables below. | |||
| | [`performance-schema-consumer-statements-digest`][perfschema-consumer-statements-digest] | `ON` | Configures the `statements-digest` consumer. | |||
| | [`innodb_monitor_enable`][sysvar_innodb_monitor_enable] | all | Enables InnoDB metrics counters. | |||
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| !!! caution alert alert-warning "Important" | |||
| When dealing with long queries, increasing the value of the variable [performance_schema_max_digest_length](https://dev.mysql.com/doc/refman/8.0/en/performance-schema-system-variables.html#sysvar_performance_schema_max_digest_length) will avoid having query examples truncated. | |||
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we also have --max-query-length flag in pmm-admin add commands to limit query length in QAN, where -1 value is no limit
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But that is a pmm-admin config parameter and not a MySQL variable. I'd defer that to be added by the doc team
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than it won't be true in context of PMM. @rnovikovP PTAL ^
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As I understand, To have queries with full length it's 2 parameters need to be tuned:
- MySQL perf schema ^
- PMM flag for the length
If both of them are aligned - then the user will see the full query (most likely .. still can be a problem with veeeeryyyy long queries )
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This is a PR for a note explaining a Performance Schema modification. Please make another one for non-related information (non-mysql modification) @rnovikovP
| @@ -206,6 +206,9 @@ To use *Performance Schema*, set the variables below. | |||
| | [`performance-schema-consumer-statements-digest`][perfschema-consumer-statements-digest] | `ON` | Configures the `statements-digest` consumer. | |||
| | [`innodb_monitor_enable`][sysvar_innodb_monitor_enable] | all | Enables InnoDB metrics counters. | |||
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| !!! caution alert alert-warning "Important" | |||
| When dealing with long queries, increasing the value of the variable [performance_schema_max_digest_length](https://dev.mysql.com/doc/refman/8.0/en/performance-schema-system-variables.html#sysvar_performance_schema_max_digest_length) will avoid having query examples truncated. | |||
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than it won't be true in context of PMM. @rnovikovP PTAL ^
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