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events_statements_history_long.SQL_TEXT mostly empty
Posted by: Yair Poleg
Date: January 09, 2023 11:27PM

Hi!

I recently noticed that the SQL_TEXT column on the performance_schema.events_statements_history_long is mostly empty, except for a few queries calling store procedures. The DIGEST_TEXT column is always populated for all kinds of queries (select/insert/update), but not the SQL_TEXT.

I've checked the following:
1. performance_schema.setup_instruments --> all entries matching "statement/%" are enabled.

2. performance_schema.setup_consumers --> events_statements_history_long is enabled.

3. The events_statements_history_long size was set to 10000. I also increased it to 200000, still didn't help.

More info:
1. We are using MySQL v8.0.31 on AWS RDS.

2. In the past, when we were on version 8.0.19, it seemed to have worked as expected. We had tons of SQL_TEXT for all kinds of queries (select/insert/update etc).

3. Are we using prepared statements? not so much. Even when I issue a query through a simple SQL client, I can see a new entry on the table, but the SQL_TEXT column is empty (the DIGEST_TEXT, of course, is populated as expected).


Any ideas about what changed between 8.0.19 and 8.0.31 and how can we get the SQL_TEXT column populated as it used to be?

Thanks,
Yair

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