AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Sql deadlock trying to drop a datbase12/7/2023 ![]() I was then able to once again perform the function using the Access script using the ODBC Access to MySQL connection. My solution: I used Sun's (Oracle's) free MySQL Query Browser (that I previously installed on my computer) and ran the delete query there. JobQueue CHECK CONSTRAINT FKJobQueueTenant GO indexes - ALTER TABLE transactions. Tenant ( TenantId) GO ALTER TABLE transactions. I tried running delete query for this group of records on the cPanel mySQL access on the web. JobQueue WITH CHECK ADD CONSTRAINT FKJobQueueTenant FOREIGN KEY ( TenantId) REFERENCES masters. In addition on my latest run through of this I had to find and kill the one user connection before any of the above would work. Restoring from a backup was not an option. ALTER DATABASE YourDBName SET MULTIUSER WITH ROLLBACK IMMEDIATE. The insert statement in both transactions needs to take an exclusive lock on the table and hold it for the duration of the transaction (i.e. Select the Check box Close existing connections to Drop Existing Connections before Dropping the SQL Server Database and click OK to Drop Database in SQL Server. Since my database is on a web server, I couldn't restart the database. Youre trying to update T1 at the same time as inserting into T1 on another thread. Try renaming the table before attempting to drop it as following: ALTER TABLE mydb.mytable RENAME mydb.mytabletodrop TRUNCATE TABLE mydb.mytabletodrop DROP TABLE mydb. Just looking at those Deletes, I see two issues - Potentially inefficient way to delete rows. ![]() The other session is running spcolumns100 which is a metadata discovery procedure that returns column metadata potentially for many tables. Code language: SQL (Structured Query Language) (sql) Summary SQL Server deadlock is a problem in which two sessions lock on a resource that the other session wants to access and vice versa. One will be automatically killed (by InnoDB) the other will to the task assigned. The DROP TABLE might be in a transaction trancount'2' so it might own X locks from previous statements, which makes for more deadlock risk. ![]() ![]() I tried to run through the operations available in phpMyAdmin for the table (optimize,flush, etc), but I was getting a need permission to RELOAD error when I tried to flush. 1 Answer Sorted by: 1 Those two DELETEs are each doing a full table scan looking for certain rows to delete. SQLSTATE 40001: Serialization failure: 1213 Deadlock found when trying to get lock try restarting transaction. What is blocking Blocking is an unavoidable and by-design characteristic of any relational database management system (RDBMS) with lock-based concurrency. Typically I would delete certain records from MySQL then replace with updated records (cascade delete several related records, this streamlines deleting all related records for a single record deletion). Issue inside cursor: SET = 'KILL ' + had this problem when trying to delete a certain group of records (using MS Access 2007 with an ODBC connection to MySQL on a web server). Though, the error message would look otherwise.Īre you sure that there is no hidden process that is connecting to your database? A good approach would be to run a script which kills all sessions and immediately after rename the database to another name and then drop database.Ĭreate a cursor based on this select: select d.name, convert (smallint, req_spid) As spid Make sure you don't have dependencies like database snapshots on the db you want to remove. ![]()
0 Comments
Read More
Leave a Reply. |