Database Administrator

Here we will mention two possible problems. FirstBatch Processing TaskThis task may not have enough space to complete the Redo, or because the speed is fast, the online redo log has been switched before it is archived to the offline redo log (all

Table creation SQL Create table student ( Student_id number primary key, Student_name vARCHAR2 (30) not null) Insert into STUDENT (STUDENT_ID, STUDENT_NAME) Values (1, 'zhang san '); Insert into STUDENT (STUDENT_ID, STUDENT_NAME) Values (2,

Org. springframework. beans. factory. beanCreationException: Error creating bean with name 'sessionfactory 'defined in ServletContext resource [/WEB-INF/config/applicationContext. xml]: Invocation of init method failed; nested exception is org.

After installing a new device, due to operation errors in the parameter value added more than 0, resulting in SGA_MAX_SIZE and SGA_TARGET set the value is too large, when restarting the database prompt ORA-27100: shared memory realm already exists.

I wonder why the ASM instance created with DBCA cannot be started. Manual start SQL> startupORA-01078: failure in processing system parametersLRM-00109: cocould not open parameter file '/opt/Oracle/product/10.2.0/db_1/dbs/init + ASM.

The lazy and fetch settings in the relationship between Hibernate will affect the SQL statement operations when querying data. The fetch settings have a higher priority than the lazy settings, andThe lazy attribute configured on the class tag does

In the previous configuration process of migrating a single-instance database to the rac environment (SEE), we introduced the use of standby technology to build the data guard model for the physical standby database of a single-instance master

1. Mongo objectA connection pool is implemented internally. Mongo objects are thread-safe. Therefore, you can create only one Mongo object and use it safely in a multi-threaded environment. Therefore, we can use the Mongo variable as a member

MongoDB has officially supported Sharding since version 1.6. MongoDB also released Replica Sets to replace earlier versions of Replica Pairs. By combining Sharding and Replica Sets, we can build a distributed, highly available, and automatically

Problem: ORA-01187: cannot read from file because it failed verification tests ORA-01110: data file 201: '/u01/oradata/md/temp01.dbf' Problem reproduction: [SQL] Sys @ DENVER>Alter DatabaseBackup controlfileToTraceAs '/Tmp/t1. SQL';

If you encounter any problems during the installation process, you can discuss them and learn together. If there are any errors, please let us know. Thank you. 1. First modify the/etc/sysctl. conf file to add parameters. [Root @ redz-server ~] # Cat>

Oracle redo online Log File reconstruction in seven steps redo online log reconstruction in five minutes redo log Reconstruction Step 1: create three new online log groups: ALTER DATABASE ADDLOGFILEGROUP4

How to allow remote MySQL user access (successful test in Ubuntu) 1. Log On with the root user and perform the following two steps (Note: [password] indicates the actual password of your root user ): 1.1 use mysql; 1.2 grant all on *. * TO 'root'

Overview of RAC archive log sharing Whether the database is single-node or cluster, the way it carries things is strictly in the order of timestamps. This determines that the log records should be read in strict chronological order during database

Multi-Table queryAnd other connectionsCreate a connection condition by using columns with the same meanings in two tables.The query results only show the row data with the values of the two columns being equivalent conditions.The table name prefix

Install MySQL NDB Download: mysql-cluster-gpl-7.1.10-linux-x86_64-glibc23.tar.gz Before configuring the ndb, You need to systematically grasp the mysql ndb configuration method theoretically, so that you can avoid many detours.I. Pre-configuration

Implementation of the stored procedure for the Oracle large table replication solution: ProcedureMakePayPlayIraBakNewIs V_num number; Begin Vanceinfo. gmac_log_pro.setloginfo ('Makepayplayirabaknew', '123', '9', Sysdate,

If the SQL statement contains fields not in the table, the following error occurs: Android 2.3.3 Eclipse Version: 3.7.0 Console LogCat error message: 02-23 11:20:41.360: ERROR/AndroidRuntime (4366): Android. database. sqlite.

Requirement Description In reports with specific requirements, some layout objects may be displayed or hidden under certain conditions. There are two methods for developers to develop reports in Oracle reports builder. Use Format Trigger for

1. Install unixODBC Use YUM for installation: Linux uses a CD to build a local YUM Server [Root @ rac1 mnt] # yum install unixODBC [Root @ rac1 mnt] # yum install unixODBC-devel   Run the isql command to install unixODBC. You can use this command to