mysqlinnodb
why i can have two locks( X and S) on one record in innodb? i know that S and X lock can not exists at the same time
why i can have two locks( X and S) on one record in innodb? i know that S and X lock can not exists at the same time.
Solution
You can't. Your S lock is escalated to an X lock with these two queries executed in sequence within the same transaction. You don't have both.
If a second transaction also obtained an S lock on the same records, and then your FOR UPDATE query were run, it would block at least until the other transaction made its next move, perhaps longer, until the lock escalation could occur or be determined impossibe. Eventually the prompt would return or you'd get a deadlock.
- Combine rows if the dates exist in another row
- Distinguish between two maximum values in a column with Power Query
- Power Query Conditional JOIN - JOIN with WHERE clause
- Calculate combinations for a range of text values in excel
- How to update a column's values in Power BI M Language
- What's the difference between DAX and Power Query (or M)?
- Sorting issue when consolidating monthly data into a year to date file. Using query, sorting by day, time, and letter
- Power Query `List.Generate` runs too slow
- Custom Colum based on specific dates in powerquery
- How do I properly use table.group in a PowerQuery query to dynamically summarize different rows and columns?
- Excel Power Query syntax issue transform multiple columns of records
- How to capitalize only first letter of a sentence
- Power Query Import For Power BI with group by on SelectRows
- Get data from config table cell when loading data source with power query
- Translate Excel Formula into Power Query
- Counting matching pairs of letters in lists of bigrams in Power Query M
- Bigrams of a string in Power Query M
- Power Query code to refer to another query (and how buffering works)
- M code for the equivalent of of Left (string, len(string)-11)
- How to add a missing column to the Transform Sample File
- How to add or insert ' (single quotes) for every string in a list in which strings are separated by commas in Power Query
- Power BI M code Split column from Lowercase to Uppercase won't include diacritics (accents)
- M Code(Power Query) to Remove Empty columns that runs fast
- How to find the value with date closest to another date
- Error when build AOSP 14 - internal error: undefined variable CTS_TEST_SUITES_DEFAULT
- Call a table using a dynamic identifier
- Problem getting the value from a cell using M in excel
- How to rename columns based on the data within them in Power Query M?
- Power Query return a field name based on parameter
- Power Query: after combining 2 tables got something strange