rollback mssql

Reading directory (content) 1 Concurrency control theory 1.1 Pessimistic concurrency control 1.2 Optimistic concurrency control 2 Isolation Level 2.1 Isolation Level Description 2.2 Read commmitted

If reproduced, please indicate the source of the blog: www.cnblogs.com/xinysu/, copyright belongs to the blog Garden su Home radish all. Hope you support! MySQL implements concurrency control through MVCC and locks, and in 4 isolation

Run environment overview of the autumn Garden: the database is Access in a subdirectory of a foreign godaddy VM. Access paging: 1: topmax (id) is used as the paging mode when the CYQ. Data framework supports Access. In the absence of many articles

  Running environment overview of the autumn Garden:Currently, the database is Access in a sub-directory of a foreign godaddy VM.   Access pagination:   1: top max (id) When the CYQ. Data framework supports Access, top max (id) is used as the paging

1. What is a transaction: a transaction is an indivisible working logical unit that is used as the smallest control unit when performing concurrent operations on a database system. All of the database operations commands he contains are either

Version: MSSQL 2008Backup scenario: SQL migration from a server to Server B, and the data is also migrated past.Operating environment: A server: WINDOWS7 B Server: WINDOWS8.1 auxiliary tool: VNCFirst, backup from a server:OK, the backup is complete.

1. What is a transaction: a transaction is an inseparable logical unit of work. It is used as the smallest control unit to execute concurrent operations on the database system. All the database operation commands contained in the database are

Mssql + operation class classDbQueryForMssql {& nbsp; ** & nbsp; * Maximum number of records returned by the select Method & nbsp; * & nbsp; constMAX_ROW_NUM100000; & nbsp; ** & nbsp; * Data Query Result set object & nbsp; * @ varobject $ dataSet &

1. What is a transaction: a transaction is an inseparable logical unit of work. It is used as the smallest control unit to execute concurrent operations on the database system. All the database operation commands contained in the database are

There are many reasons for slow query speed. The following are common causes:1. No index or no index is used (this is the most common problem of slow queryProgramDesign defects)2. Low I/O throughput, resulting in a bottleneck effect.3. the query is