phantom playbooks

/unlock processingBegin;Insert into test... add the lock corresponding to insertUpdate test set... add the lock corresponding to updateDelete from test... add the lock corresponding to deleteCommit; when a transaction is committed, the corresponding locks of insert, update, and delete are released at the same time.Although this method cannot avoid deadlocks, the two-segment lock protocol can ensure that the concurrent scheduling of transactions is serialized (serialization is very important, esp

Problems caused by transaction concurrency Dirty read: One Transaction reads data that has not been committed by another transaction. Non-repeated read: The same transaction reads the same data twice and gets different results. Phantom read: The same transaction reads data twice with the same condition. The number of data records in the result set is different (the number of data records is too large or less ). Supplement: explain the terms

Ansible-Tower Quick Start-1. Overview [translation], ansibletower Overview Tower Ansible-Tower is a web interface of Ansible and uses rest api as the endpoint for access. By using open-source orchestration engine, whether it is to share operation tasks with your team, or to integrate with your Ansible through REST APIs, tower provides many powerful automation tools to make your life easier. Real-time playbooks output and browsing You can view the run

Roles is similar to the State in the salt-stack, and the State has a certain organizational structure. Roles is the playbooks directory structure in ansible. What are the advantages of this division? There are more advantages. If you write everything into playbooks, This may cause our playbooks to be bloated and should not be read. After modularization, roles has

If you do not have written authorization, do not repeat Chapter 4. Use of ansible in large projects RolesIf your playbooks start expanding beyond what includes can help you solve, or youstart gathering a large number of templates, you may want to use roles. Roles inAnsible allow you to group files together in a defined format. They are essentiallyan extension to includes that handles a few things automatically, and this helps youorganize them inside

Ansible @ an efficient configuration management tool-Ansible configure management-translation (8), ansible-ansibleIf you do not have written authorization, do not repeat Chapter 4. Use of Ansible in large projects RolesIf your playbooks start expanding beyond what includes can help you solve, or youstart gathering a large number of templates, you may want to use roles. Roles inAnsible allow you to group files together in a defined format. They are es

[Magic array composition]The Phantom arrays consist of a main battle Phantom and 4 and an auxiliary Phantom. This means you have to prepare at least five phantom beasts, preferably purple. If you don't have enough phantom beasts, you can only use them for drilling. If yo

update corresponding to the lock Delete from Test .... Add delete corresponding to the lock Commit When a transaction commits, the lock corresponding to the INSERT, update, and delete are released simultaneously While this approach does not prevent deadlocks, the two-phase lock protocol ensures that concurrent scheduling of transactions is serializable (serialization is important, especially in data recovery and backup).Four isolation levels fo

Ghost Buttons --those transparent, clickable objects--suddenly become ubiquitous. The storm is sweeping the web design field. Who would have thought that something as simple as a button could change the way we look at Web design?Reference: Predicting trends in web designWhat is a phantom button?The Phantom button has the simplest flat shape-square, Rectangle, Circle, diamond-No fill color, only a faint silh

lock for INSERT, UPDATE, delete is also releasedAlthough deadlock cannot be avoided in this way, the two-segment locking protocol ensures that concurrent scheduling of transactions is serialized (serialization is important, especially when data recovery and backup). Lock mode in a transactionFour isolation levels for transactionsin the database operation, the transaction isolation level is proposed in order to effectively guarantee the correctness of concurrent read data. Our database locks al

share the lock, but not the lock), before the write operation to request and obtain an X lock (exclusive lock, other transactions can no longer acquire any locks). The lock does not succeed, the transaction goes into a wait state until locking succeeds to continue execution. Unlocking phase: When a transaction releases a block, the transaction enters the unlock phase, and the lock operation is no longer allowed at this stage. While this approach does not prevent deadlocks, the two-phas

/code/flashdll/pst_fp_fileio.cpp 07:38:34, August 14,200 7Line: 139Error: the C:/aep009 package/release is not found.File: Y:/test_dev_usb/flash/code/flashdll/pst_fp_fileio.cpp 07:41:12, August 14,200 7Line: 3922Error: Phone [0000]: The "secure_effecla_flash" interface cocould not be found. The super-file is secure and for re-flash; The phone needs a super-file that is not secure and for reflash.File: Y:/test_dev_usb/flash/code/flashdll/pst_fp_flashthread.cpp 07:52:44, August 14,200 7Line: 3922E

If you do not have written authorization, do not repeat Chapter 4. Use of ansible in large projects RolesIf your playbooks start expanding beyond what includes can help you solve, or youstart gathering a large number of templates, you may want to use roles. Roles inAnsible allow you to group files together in a defined format. They are essentiallyan extension to includes that handles a few things automatically, and this helps youorganize them insid

): + - defV2_runner_on_ok (self, result): +Host =Result._host ALogging.warning ('===v2_runner_on_ok====host=%s===result=%s'%(host, Result._result)) at - - defV2_runner_on_failed (self, result, ignore_errors=False): -Host =Result._host -Logging.warning ('===v2_runner_on_failed====host=%s===result=%s'%(host, Result._result)) - in defv2_runner_on_unreachable (self, result): -Host =Result._host toLogging.warning ('===v2_runner_on_unreachable====host=%s===result=%s'%(host, Result._res

1. Concurrency consistency Common concurrency consistency problems include: Lost modifications, non-repeated reads, dirty reads, and Phantom reads (Phantom reads are often classified as non-repeated reads in some materials ).1.1 lost Modification Next, let's take an example to illustrate the data inconsistency caused by concurrent operations. Consider an activity sequence in the aircraft booking system: A

Document directory 2.2.1 concurrency consistency 2.2.2 solutions to concurrency consistency problems 2.2.3 transaction isolation level 2.2 SQL Server 2000 + ADO. Net concurrency control 2.2.1 concurrency consistency Common concurrency consistency problems include: Lost modifications, non-repeated reads, dirty reads, and Phantom reads (Phantom reads are often classified as non-repeated reads in some mat

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Document directory 2.2.1 concurrency consistency 2.2.2 solutions to concurrency consistency problems 2.2.3 transaction isolation level From http://www.cnblogs.com/zhenyulu/articles/330494.html The complete code of this part can be downloaded from here.2.2 SQL Server 2000 + ADO. Net concurrency control 2.2.1 concurrency consistency Common concurrency consistency problems include: Lost modifications, non-repeated reads, dirty reads, and Phantom re

phantom reads one by one. The default isolation level set by MySql is Repeatable Read, which can be Repeatable Read. Isolation level can be configured. √: Possible Occurrence ×: no Dirty read Non-repeated read Phantom read Read uncommitted √ √ √ Read committed × √ √ Repeatable read × × √ Serializable × × × Not

2.2.1 Concurrency Consistency issuesCommon concurrency concurrency Consistency issues include: missing changes, non-repeatable reads, read dirty data, Phantom reads (Phantom reads are often associated with non-repeatable reads in some materials).2.2.1.1 Missing changesLet's take a look at an example that shows inconsistencies in the data caused by concurrent operations.Consider an activity sequence in the a