The deepest cause of all deadlocks is: resource competition performance 1:A user a accesses Table A (locking table A) and then accesses Table BAnother user B accesses table B (Table B is locked) and then attempts to access Table
At this time, user a has locked table B because user B has to wait for user B to release table B to continue. Well, the old man will have to wait honestly.Similarly, user B has to wait for user a to release Table A to continue.Solution:This deadlock is caused by bugs in
In fact, the deepest reason for all deadlocks is: resource competition performance 1:A user a accesses Table A (locking table A) and then accesses Table BAnother user B accesses table B (Table B is locked) and then attempts to access TableAt this time, user a has locked table B because user B has to wait for user B to release table B to continue. Well, the old man will have to wait honestly.Similarly, user B has to wait for user a to release Table A to continue.Solution:This deadlock is caused b
correct, should every request error Ah, now is dozens of times only one or two times the error, certainly not this reason.Search on the internet for half a day, no fruit, so put the code on the server to simulate concurrent testing, or there will be one or two times the error, but the report of the error is very clear# # # Error QueryingDatabase. Cause:com.microsoft.sqlserver.jdbc.SQLServerException: Transaction (Process
Transaction ID in DB2
Author: anonymous time: Source: Internet Editor: XiaoYu
Abstract: The transaction ID in DB2
Retrieve the unique identifier of a unit fro
transaction ID in DB2
Author: anon Time: 2005-08-12 17:39 Source: Internet Zebian: Small fishing
Summary: Transaction IDs in DB2
To retrieve a unique identifier for a work c
Delete a message will cascade delete response information, then we need to use the transaction, the following SQL
Copy Code code as follows:
ALTER PROCEDURE [dbo]. [Proc_tb_leaveword_delete]
(
@leavewordID INT,
@record TINYINT OUTPUT
)
As
BEGIN
BEGIN TRY
BEGIN TRANSACTION
DELETE from Tb_leavewordid WHERE leavewordid= @leavewordID
DELETE from tb_reply WHERE leavewordid= @leavewordID
SE
You will often use your own ID in your project, such as UID, the simplest way is to use the auto_increment directly with the database, but if the user is very large, tens of millions of, hundreds of millions of and then need to be stored in the table, this scenario is not possible, so it is best to have a global self-increasing ID of the generator , regardless of whether it is a table or not, you can get a
Note: The transaction (process ID 56) and another process are deadlocked. | the communication buffer zone resource has been selected as the deadlock victim ., Note as dead
An exception occurred during SQL concurrent UPDATE today: (the Code is as follows)
// Parallel class can generate concurrent operations (that is, multithreading) Parallel. forEach (topics, topic =>{// DBHelper is an encapsulated databas
An exception was encountered today when doing SQL Concurrency update: (Code below)// Parallel class can produce concurrent operations (i.e. multithreading) Parallel.ForEach (topics, topic ={ //DBHelper is a encapsulated database operation class, the following line of code executes the UPDATE statement "topicid=" + topic. TOPICID);});This problem occurs because, in SQL Server by default, an SQL statement is a transaction. When multi-threaded simu
Projects often use the ID, such as UID, below for the use of MySQL transaction characteristics to achieve concurrent security of the ID, interested friends can refer to the following You will often use your own ID in your project, such as UID, the simplest way is to use the auto_increment directly with the database,
Using the mysql transaction feature to implement concurrent and secure auto-increment ID example bitsCN.com projects often use auto-increment IDs, such as uid. The simplest way is to directly use the AUTO_INCREMENT provided by the database, however, if the number of users is very large, tens of millions, hundreds of millions, and then needs to be stored in sub-tables, this solution is not fixed, so it is be
Auto-increment IDs are often used in projects, such as uid. The simplest method is to directly use the AUTO_INCREMENT provided by the database. However, if the number of users is large, tens of millions, when hundreds of millions of users need to store sub-tables, this solution cannot be implemented, so it is best to have a global auto-incremental ID generator, whether or not it is a sub-table, global Auto-increment IDS can be obtained from the genera
Deleting a message will cascade the reply information. At this time, we need to use the transaction, as shown in the following SQL
Copy codeThe Code is as follows: alter procedure [dbo]. [proc_tb_leaveword_delete]
(
@ LeavewordID INT,
@ Record TINYINT OUTPUT
)
AS
BEGIN
BEGIN TRY
BEGIN TRANSACTION
Delete from tb_leavewordID WHERE leavewordID = @ leavewordID
Delete from tb_reply WHERE leavewordID = @ leavewor
Transaction (Process ID 161) was deadlocked on lock | Communication buffer resources with another process and have been chosen as the deadlock victim. Rerun the transaction.--This would cause read transactions to don't take any locks and is blocked by existing locksALTER DATABASE [Febdb_shimao] SETSingle_user with ROLLBACKIMMEDIATEALTER DATABASE [Febdb_shimao] SE
Recently, when processing data in a table in SQL Server 146 using multiple threads, the [transaction (process ID) was deadlocked on lock resources with another process and has beenChosen as the deadlock victim. Rerun the transaction error is displayed. I thought it was correct.ProgramThe reason why the lock is applied causes a deadlock. Later I found that this is
Deleting a message will cascade the reply information. At this time, we need to use the transaction, as shown in the following SQLCopy codeThe Code is as follows:Alter procedure [dbo]. [proc_tb_leaveword_delete](@ LeavewordID INT,@ Record TINYINT OUTPUT)ASBEGINBEGIN TRYBEGIN TRANSACTIONDelete from tb_leavewordID WHERE leavewordID = @ leavewordIDDelete from tb_reply WHERE leavewordID = @ leavewordIDSET @ record = 0 -- SuccessCOMMIT TRANSACTIONEND TRYBE
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