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SQL basic tutorial SQL advanced tutorial SQL function SQL summary SQL Quick Reference SQL tutorial summary SQL quiz my quiz results are as follows: SQL quiz results: 2020 SQL basic tutorial SQL advanced tutorial SQL function SQL summary SQL Quick

Although I have never used column-and-column conversion in the development process, I have heard that this problem is often encountered during interviews. I have seen some examples on the Internet before. I have carefully played these questions

Environment: ORACLE11GR2 + windows2012 Description: After the customer restores the cold backup to start the database, about 30 seconds after the start of the database can not be operated, prompt ORA-03113: The end of the communication channel file

Implicit conversion causes index failure. this point should be paid attention. it is also a common mistake in development. because the table field tu_mdn is defined as varchar2 (20), this field is passed to m as the number type with the where

Classop_log (models. Model): op_datemodels.DateTimeField (auto_nowTrue) op_logmodels.CharField (max_length2000) CIA Class op_log (models. Model): op_date = models. DateTimeField (auto_now = True) op_log = models. CharField (max_length = 2000) CIA

Today, I will summarize the reasons why oracle does not use indexes. Take notes while learning. Clustering factor is a measure of the similarity between the data sequence of index columns and the data sequence of table fields. Today, I will

Altertabletablenameadd (columndatatype [defaultvalue] [nullnotnull], hellip;.); altertabletablenamemodify (colum Alter table tablename add (column datatype [default value] [null/not null], hellip;.); alter table tablename modify (colum Alter

The UTL_FILE package can be used to read and write text files on the operating system. UTL_FILE provides file access functions on the client (FORM, etc.) and on the server. The UTL_FILE package can be used to read and write text files on the

How do I diagnose a ORA-00060DeadlockType through trace? How do I diagnose the ORA-00060 Deadlock Type through trace? Today is. During the database performance tuning process, I suddenly moved to the previous email with the following

When a DBA logs on to a local Or remote database, it is no longer common to log on to the database using the sqlplus username and password @ Connection Service name. When a DBA logs on to a local Or remote database, it is no longer common to log on

When you use a client or other methods to connect to data and type Chinese data, garbled characters are displayed in the client. Of course, this is a problem with character set settings. I have tried many methods. When you use a client or other

MySQL -- Binarylog recently found that there are as many as 14 GB log files when viewing the monitoring server. I checked the following information: binarylog, Which is mysql MySQL -- Binary log recently found that there were as many as 14 GB log

Percona is a branch of mysql. I believe many of my friends are familiar with it, And percona-toolkit is its toolkit, which contains a lot of good and practical mysql Percona is a branch of mysql. I believe many of my friends are familiar with it,

Mysqlsla is a MySQL Log Analysis Tool launched by hackmysql.com. It can analyze mysql slow query logs and analyze slow queries. It can analyze slow query language for databases. Mysqlsla is a MySQL Log Analysis Tool launched by hackmysql.com. It can

In some cases, some businesses cannot tolerate data loss. In other cases, Database Availability may be more important than data loss. Some applications require the database to maximize performance and tolerate a small amount of data. In some cases,

Oracle11g installation diagram in RedHatLinux5.5 Oracle 11g installation diagram under RedHat Linux5.5 In Linux, it is best to install the Oracle System with 1 GB memory and 2 GB swap space. The hard disk requires at least 4 GB space. At least

Next, I will summarize how to install MySQL in Ubuntu12.04 over the past few days: There are three ways to install MySQL in Linux: one is to install MySQL in rpm binary file, and the other is to install MySQL in rpm binary file. Next, I will

The ORA-39125: WorkerunexpectedfatalerrorinKUPW $ WORKER. PUT_DDLSwhilecallingDBMS_METADATA. ORA-39125: Worker unexpected fatal error in KUPW $ WORKER. PUT_DDLS while calling DBMS_METADATA. Processing object type

The automatic backup script of RMAN under RHEL5 is written on the server for scheduled execution: (1) Full backup of the database, backup of control files and archive log files at the same time. The automatic backup script of RMAN under RHEL5 is

1, first add 3 Disk 2, installation package [root @ myorclasm] # lsOracleasm-2.6.18-348.6.1.el5-2.0.5-1.el5.i686.rpmoracleasm-2.6.18-34 1, first add 3 Disk 2, installation package [root @ myorcl asm] # ls Oracleasm-2.6.18-348.6.1.el5-2.0.5-1.el5.i686