Database Administrator

The Value Type of the hiredate column in the emp table updated today is date. Use the first statement update myemp set hiredate = '2017-03-06 'where ename = 'liutao '; Unsuccessful If this is not the case, use update myemp set hiredate = '03-06-85

For systems with large data volumes, the query efficiency is low, and the insertion time is long. We have a business system. It takes 4-5 minutes to import data every day. This time-consuming operation is actually very risky. If the program has a

I. Common connection query methods in Oracle (exercises with built-in oracle tables) 1. left outer join (left outer join/left join) Left join is based on records in the left table. All records in the left table are displayed. Only records meeting

To audit DDL operations in the database, you can use DDL triggers. This section describes an example to record all DDL operations in the database. This example can be used in Oracle 8i or later versions. Step 1: Create a tablespace and related log

SQL> conn sys/system @ jytest as sysdbaERROR:ORA-12537: TNS: connection closed 1. The processes parameter is too small.Go to the settings processes method:The relationship between Oracle sessions and processes isSessions = 1.1 * processes + 5Use sys

Cause: because a data file in the Oracle database is accidentally deleted, the Oracle-related services on the control panel are started, but SQL * Plus cannot be connected. Solution: You can open the database by taking the data file offline

1. Create a sequence -- Create sequence Createsequence SEQ_TEST_JOB Minvalue 1 Max value 9999999999999999 Start with 2 Increment by 1 Cache 20; 2. Create a Baotou Createorreplace package PKG_TEST_JOB IS -- Author: ADMINISTRATOR --

The crs_register command registers resources to CRS. This method usually combines crs_stat-p or crs_profile to create a configuration file first. Crs_register also provides the CRS update function. This article describes the usage of crs_register

Oracle11.2.0.10 File 1 Http://download.oracle.com/otn/nt/oracle11g/112010/win64_11gR2_database_1of2.zip File 2 Http://download.oracle.com/otn/nt/oracle11g/112010/win64_11gR2_database_2of2.zip After downloading, pressurize files 1 and 2 and

Environment MySQL 5.1 + command line tool Problem Garbled characters are displayed in the exported SQL statement of mysqldump. Solution Mysqldump-uroot -- default-character-set = utf8-p axt> kq. SQL Summary SQL garbled characters may

Tnsping server exceptionFor example, tnsping intelC: \> tnsping intelTNS Ping Utility for 32-bit Windows: Version 9.2.0.1.0-Production on August 16-2012 15:37:27Copyright (c) 1997 Oracle Corporation. All rights reserved.Used parameter files:D: \

(I) three major functions ① Collect and delete index, table, and cluster statistics ② Verify the structure of tables, indexes, and clusters ③ Identification table and cluster and row migration and row Link For analyze's function of collecting and

MySQL backup category. For more information, see the previous article on MySQL backup category. Cold backup: The cold backup of the InnoDB Storage engine is very simple. You only need to back up frm files, shared tablespace files, independent

Step 1: Try to delete sqlplus using the SQL command. If the deletion is successful, everything is fine! However, if you want to delete a session with a deadlock through a command line or using an Oracle management tool, oracle will only mark the

In the previous article, three articles mentioned Oracle listening, as follows: Dynamic Registration and static registration of Oracle Listener Description of services in Oracle Listener (Listener) Oracle Database Listener Configuration By default,

Oracle RAC client failover (failover). When using the TFA method, the client does not need to send a connection request again when the connected instance or node fails, the previous database operations can still be continued, which is called

Currently, BI presentation is generally based on historical data analysis. To achieve real-time BI, it is not impossible to achieve it. Some time ago, due to work needs, Microsoft's Active cache mechanism was specifically verified.I. Basic

Take Oracle database as an Example 1 exists usage Exists can only be used for subqueries. It can replace in. If the result is matched, the internal query is exited and the condition is set to true. All results are returned, all in matches are

When the Oracle database is connected to hang, there are two listener, one is the other sub-processThe process is as follows:1. When a problem occurs, the user connects to the hang and two listener occurs. The existing connection is normal.$ Ps-ef |

(Translated from python v2.7 document) Sqlite is a C language library that provides a lightweight file database solution. She does not need server support and supports non-standard SQL statements. Sqlite has been integrated into the python Standard