Database Administrator

The system reports an SQL exception. The content is as follows: Java. SQL. SQLException: ORA-01795: maximum number of expressions in a list is 1000 The SQL statement executed when an exception is thrown is not surprising. It is a common SQL

There is only one reason for MySQL to show that The table is full. The corresponding table data capacity has reached The system limit. For specific restrictions, see the official manual: http://dev.mysql.com/doc/refman/5.1/zh/introduction.html?table-

Oracle 10GManual creation of database Helloblock writing) 1. Set the Instance name:Modify the/home/oracle/. bash_profile file and add the following lines. Use the command source/home/oracle/. bash_profile to make the modification take effect. 2.

In oracle, The wm_concat (column) function can be used to merge field values. The merged fields are separated by commas by default, or you can specify them by yourself. For example: Wm_concat (col1 ); Replace (wm_concat (col1), '|'); -- custom

4. Prepare 4.1 space for system installation Space required by Sota: The sota program size and the log file size are at least 60 MB. Space required for sotaData: the size of the job is allocated according to the workload, and the log increment is

1. PL/SQL Developer remember the Login PasswordWhen PL/SQL Developer is used, PL/SQL Developer needs to remember the username and password for logging on to Oracle for ease of work;Setting Method: PL/SQL Developer 7.1.2-> tools-> Preferences->

I. Restoring the mysql password in Linux Service mysqld stopmysqld_safe -- skip-grant-tables; ctrl + z pause # Start mysql service mysql-u root-p in safe mode # Use root User Login Without Password ): mysql> use mysql; mysql> update user set

For example, there is a Chinese table as follows: Example 40: Create table Test table Id number, Name VARCHAR230 ), FLAG CHAR1 ), CONSTRAINT PK_TESTD primary key id) using index ); -- Create the mv log and MV at the source end: Drop materialized

Mysql cluster solves single point of failure and backs up) Cluster Software Mysql-cluster-gpl-6.3.20-linux-i686-glibc23. The cluster has three roles. Manage processes Mysqld Process Ndbd Process There are three processes in the management

The permission system of the oracle database includes system permission and object permission. Database system privilege allows users to execute specific command sets. For example, the create table permission allows users to create tables, and

Multiple mysql instances are started on one server) Currently, each server has a corresponding database. To ensure data security, master-slave replication is used for backup. However, one-to-one backup is a waste of resources, therefore, the

Pasted online 1. connect by prior recursive algorithm in oracleSelect... from tablename start with condition 1 Connect by condition 2 Where Condition 3; Example: Select * from table Start with org_id = 'hbh1_wgwpy' Connect by prior org_id

The RS/6000AIX Boot Mode is divided into multi-user normal mode and single-user service mode. Generally, the multi-user guide mode is selected under normal circumstances. During system maintenance, the single-user mode is selected. 1. Multi-User

1. process description In AIX, a process is a task, and a running program is a process. 2. child and parent Processes A process can be dependent on a process. A process can generate a new process. The generated process is called a child process,

1. Download gqlplus, download link http://jaist.dl.sourceforge.net/project/gqlplus/gqlplus/1.12/gqlplus-1.12.tar.gz. 2. Upload to linux, decompress and compile and install 2.1tar-zxvfgqlplus-1.12.tar.gz 2.2cdgqlplus-1.12 ./Configure Make 3.

Using backup controlfile is usually used to restore the current control file because the current control file is lost and the original backup control file is changed compared with the current situation. Using backup controlfile After the recover

The SQL statement to be executed is as follows: Insert into user (username) value ('A '); Insert into user (username) value ('B ');Insert into user (username) value ('C ');Insert into user (username) value ('d '); When executed in SQL Window, an

I. Security username and password) Find requirepass in redis-conf and change it to requirepass *****. There are two methods to use the password 1. Go to redis-cli and then auth ****** 2. redis-cli-****** Ii. Master-slave Replication 1. The Master

Redis replication is unstable. When the slave times out, a resync operation is executed, causing the master to execute bgsave even if the persistence is not enabled, and send the snapshot to the slave to create a replication stream. In this case,

1.7.1.3 SkipList (skip table) Operation 1) An empty SkipList 650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131229/21010L0T-0.jpg "style =" border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px;