Tags: Service status Related Information script database state information Snapshot representationIn SQL Server replication (Replication), it is possible that the need for a new table or some tables to an existing replication (publish subscription) may occur due to changes in business requirements, which should be norm
SQL Server queries table indexes and SQL Server Indexes
SELECT index name = a. name
, Table name = c. name
, Index field name = d. name
, Index field location = d. colid
FROM sysindexes a JOIN sysindexkeys B ON. id = B. id AND. in
The table-valued parameter is a new parameter type in SQL Server 2008. Table-valued parameters are declared using a user-defined table type. With table-valued parameters, you can send multiple rows of data to a Transact-
In SQL Server performance tuning, there is an aspect problem: How do you work with temporary datasets in code that takes a long time or is frequently called? Table variables and temporary tables are two choices. Remember that a large number of temporary data set processing requirements have been seen in SQL
A) Easy to type, update efficiency:Update table1Set Field1=table2.field1,field2=table2.field2From Table2 where table1.id=table2.idb) Conventional way, this is equivalent to a left join, in the outside where is the number of updates, if not add where is all recordsUpdate table1 Set field1=(select top 1 field1 from table2 where table2.id=table1.id)where table1.id in (condition)SQL Server Update
SQL server determines whether a database, table, column, or view exists. SQL server
1. Determine whether the database exists
If exists (select * from sys. databases where name = 'database name ')Drop database [database name]
2. Check whether the
SQL Server checks whether tasks are not submitted, stops the progress, and removes the table deadlock. the SQL Server process is deadlocked.
If there are uncommitted tasks in the data warehouse, the related tables will remain in the dead warehouse, affects the query of oth
SQL Server data table field custom Custom Data Format method, SQL Server
This document describes how to customize the Custom Data Format of SQL Server data
SQL Server adds the syntax of multiple fields to the table. SQL Server Fields
Add field syntax
Alter table table_name add column_name + field type + Constraints
Add multiple fields to a tab
Tags: table name head mod using method ROM SQL Server replace IntermediateNormal spacesBefore and after spaces, use LTrim and RTrim, for example: LTrim (RTrim (Name))Middle space, replace with replace function, for example: replace (Name, ' ', ')If it is an ordinary space, it is easy to replace, but sometimes encounter some special spaces, it is more troublesome,
SQL Server obtains all column names in the temporary table or whether the specified column name exists. SQL Server column names
Retrieve all column names in the temporary table
Select name from tempdb. dbo. syscolumns where id =
SQL Server insert efficiency (heap table vs clustered index table)
"Which of the following is more efficient for SQL Server insert operations in heap tables or clustered index tables? Why is it high ?"
Some colleagues have aske
table variables, SQL Server is not generated by the log, and in the temporary table is generated log;
2 in the table variable, is not allowed to have nonclustered index;
3 The table variable is not allowed to have default defau
1. database table Locking principle1.1 The current C/S,B/S structure is multi-user access to the database, each time there will be thousands of users to access the DB, which will also access the same data, will cause data inconsistencies or read dirty data.1.2 Acid principle of business1.3 Locks are an important part of a relational database, and the database must have a locking mechanism to ensure the integrity and consistency of the data.1.3.1 resou
1. Database Table Locking Principle
1.1 currently, the C/S and B/S structures all involve multiple users accessing the database. Each time point there are thousands of users accessing the database, and the same data is also accessed, this may cause data inconsistency or dirty Data Reading.
1.2 acid principles of transactions
1.3 locks are an important part of relational databases. The database must have a locking mechanism to ensure
1. sysjobactivity table
Record the activity and status of the current SQL Server proxy job.
Job_id: Job IDRun_requested_date: date and time when the job is requested to runRun_requested_source: the requester requesting to run the job. 1 = source_scheduler, 4 = source_userStart_execution_date: date and time when the job is scheduled to runJob_history_id: used
Create a good rule name -- parameter 2 is bound to a specific table. Column Name sp_bindrule score,' student grades, score ' 9. Dismiss and delete rules Unbind the rule to remove!!! -- Unbind
--parameter- specific binding columns
' student performance. Score '
-- Delete Rule
Drop Rule Score 10. Data graphs better display the relationships between tables ~ ~ 1. Right-click the new diagram 2. Add all the tables 3. Drag the column of the select
How to determine the existence of a table or database in SQL server, but in actual use, you need to determine the Status bit:Some status bits can be set by the user using sp_dboption (read only, dbo use only, single user, etc:
1 = autoclose; Use sp_dboption to set. The database is completely closed, and its resources are released after the last user logs out.4 =
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.