the questions is:
1. why it make such error..? (e.g. tries to access non-exist folder)
2. why it doesn't create the folder by itself..?
3. should the folder created manually..? since it didn't mentioned anything in the article about that folder or even error-handling if it occurred
But why did you set the non-existing folder?
Why do you think the folder should be created by itself? Well, if you really need such a feature then ask the MySQL developers!
It looks like the folder should be created manually.
The message lists all the values it is trying to use to connect. So it is reasonably safe to assume that one or more of them is not correct. That is the only information you have to work with, so you need to investigate further to discover which one it is.
Hello database experts,
In SQL Server is an option to update statistics before detaching a database, both using Transact-SQL and management studio wizard.
The purpose and advantage of updating statistics is clear.
My question is that, why should we update statistics before detaching a database? Is there any performance issue in recovery of database while attaching? or something else?
My query to get a ranked leaderboard works on MYSQL 5.7 but gives me errors now that I upgraded to MYSQL 8.0
mysql> SELECT username,score,level, FIND_IN_SET(score,(SELECT GROUP_CONCAT(score ORDER BY score ASC)FROM highscore WHERE game = 0 AND level = 4 AND user = 10 )) AS rank FROM highscore WHERE game = 0 AND level = 4 AND user = 1 ORDER BY rank LIMIT 10;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax
to use near 'rank FROM highscore WHERE game = 0 AND level = 4 AND user = 1 ORDER BY rank LIMI' at line 1
I am familiar with SQL Server Activity Monitor. What all I know about it, have been learned by my own experinced. I decided to learn all details about it, and googled many keywords but most of results were a brief. I did not find a comprehensive article or document in detail.
Can anyone send me a well documented link?
For example the task states vary in different articles; Or what head blocker value is (the concept is clear but not the value; I thouth it is SPID but is not)?
After some extra research I found a complete list of state from different sources:
Running - The session is running one or more batches. When Multiple Active Result Sets (MARS) is enabled, a session can run multiple batches. For more information, see Using Multiple Active Result Sets (MARS). Background - The session is running a background task, such as deadlock detection. Rollback - The session has a transaction rollback in the process. Pending - The session is waiting for a worker thread to become available. Runnable - The session's task is in the runnable queue of a scheduler while waiting to get a time quantum. Spinloop - The session's task is waiting for a spinlock to become free. Suspended - The session is waiting for an event, such as I/O, to complete. Sleeping - A session in the sleeping state means a client connection without an active query. Dormant - SQL Server is resetting the session. Same as Sleeping, except Dormant also indicates that the SPID has been reset after completing an RPC event. (Replication SPIDs show "DORMANT" when waiting.)