欢迎进入网络技术社区论坛,与200万技术人员互动交流 >>进入 我的一位同事vCenter 4数据库迁移到vCenter 4.1采用datamigration工具位于vCenter安装光盘。运行他收到以下错误backup.bat脚本后: DB logs: Msg. 3013, Level 16, State 1, Server , Line 1 BACK
欢迎进入网络技术社区论坛,与200万技术人员互动交流 >>进入
我的一位同事vCenter 4数据库迁移到vCenter 4.1采用datamigration工具位于vCenter安装光盘。运行他收到以下错误backup.bat脚本后:
DB logs: Msg. 3013, Level 16, State 1, Server
Sqlcmd: Error: Microsoft SQL Native Client : An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections..

Resolution:
Note: To verify some of these settings, it is necessary to install Microsoft Studio Manager Express on the source server (the server you are migrating from). You can download this utility from the Microsoft Download Center.
Ensure that the SQL Server service itself is running on the existing vCenter Server. Having this service disabled or not running can cause this issue and prevent the script from running. To ensure that it is running:
Click Start > Run, type services.msc and click OK.
Right-click SQL Server (SQLEXP_VIM), then click Start.
Ensure that there are no firewalls blocking access to the SQL Server instance on the vCenter Server. If you are unsure, disable these services during migration, or make an exception on your firewall to allow this service to run. Ensure that TCP Port 1666 is allowed access to the service. Configuring specific firewalls is beyond the scope of this article. Consult your firewall vendor for more information.
Ensure that Named Pipes and TCP/IP protocols are enabled on the server. To ensure they are enabled:
Launch the SQL Server Configuration Manager utility and go to SQL Server 2005 Network Configuration.
In the left-hand pane, highlight Protocols for SQLEXP_VIM.
In the right-hand pane, right-click Named Pipes and select Enable, then right-click TCP/IP, and select Enable
Click Properties.
On the IP Address tab, ensure that Enable is set to Yes for each network adapter that is listed.
Click OK to close the TCP/IP Properties dialog.
In the left-hand pane, select SQL Server 2005 Services, right-click SQL Server (SQLEXP_VIM), then click Restart.
Ensure there are no Invalid entries in the Named Pipes Protocol under SQL Server 2005 Network Configuration. To check if there are invalid entries:
Launch the SQL Server Configuration Manager utility and navigate to SQL Server 2005 Network Configuration.
Click Protocols for SQLEXP_VIM and then double-click Named Pipes in the right panel.
On the Protocol tab, notice the value of the Pipe Name item. If the value contains an entry similar to \\.\pipe\MSSQL$SQLEXPRESS\sql\query , rename the entry to \\.\pipe\sql\query .

MySQLdiffersfromotherSQLdialectsinsyntaxforLIMIT,auto-increment,stringcomparison,subqueries,andperformanceanalysis.1)MySQLusesLIMIT,whileSQLServerusesTOPandOracleusesROWNUM.2)MySQL'sAUTO_INCREMENTcontrastswithPostgreSQL'sSERIALandOracle'ssequenceandt

MySQL partitioning improves performance and simplifies maintenance. 1) Divide large tables into small pieces by specific criteria (such as date ranges), 2) physically divide data into independent files, 3) MySQL can focus on related partitions when querying, 4) Query optimizer can skip unrelated partitions, 5) Choosing the right partition strategy and maintaining it regularly is key.

How to grant and revoke permissions in MySQL? 1. Use the GRANT statement to grant permissions, such as GRANTALLPRIVILEGESONdatabase_name.TO'username'@'host'; 2. Use the REVOKE statement to revoke permissions, such as REVOKEALLPRIVILEGESONdatabase_name.FROM'username'@'host' to ensure timely communication of permission changes.

InnoDB is suitable for applications that require transaction support and high concurrency, while MyISAM is suitable for applications that require more reads and less writes. 1.InnoDB supports transaction and bank-level locks, suitable for e-commerce and banking systems. 2.MyISAM provides fast read and indexing, suitable for blogging and content management systems.

There are four main JOIN types in MySQL: INNERJOIN, LEFTJOIN, RIGHTJOIN and FULLOUTERJOIN. 1.INNERJOIN returns all rows in the two tables that meet the JOIN conditions. 2.LEFTJOIN returns all rows in the left table, even if there are no matching rows in the right table. 3. RIGHTJOIN is contrary to LEFTJOIN and returns all rows in the right table. 4.FULLOUTERJOIN returns all rows in the two tables that meet or do not meet JOIN conditions.

MySQLoffersvariousstorageengines,eachsuitedfordifferentusecases:1)InnoDBisidealforapplicationsneedingACIDcomplianceandhighconcurrency,supportingtransactionsandforeignkeys.2)MyISAMisbestforread-heavyworkloads,lackingtransactionsupport.3)Memoryengineis

Common security vulnerabilities in MySQL include SQL injection, weak passwords, improper permission configuration, and unupdated software. 1. SQL injection can be prevented by using preprocessing statements. 2. Weak passwords can be avoided by forcibly using strong password strategies. 3. Improper permission configuration can be resolved through regular review and adjustment of user permissions. 4. Unupdated software can be patched by regularly checking and updating the MySQL version.

Identifying slow queries in MySQL can be achieved by enabling slow query logs and setting thresholds. 1. Enable slow query logs and set thresholds. 2. View and analyze slow query log files, and use tools such as mysqldumpslow or pt-query-digest for in-depth analysis. 3. Optimizing slow queries can be achieved through index optimization, query rewriting and avoiding the use of SELECT*.


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