Oracle

#coding:gbk import xlrd import cx_Oracle fields = [] data = [] table_name = ‘ygl_test1‘ wb = xlrd.open_workbook("清单.xlsx") sheet1 = wb.sheet_by_index(0) #取第一行做数库字段名 title = sheet1.row_values(0)

The Oracle database uses a variety of system locks to protect internal databases and memory structures that are transparent to the user.Latch (latches)A latch is a simple, low-level serialization mechanism that coordinates multiple users using

1. Create a directory directory (role System/sys)Create directory hello_file as ' D:\dupmfile ';--View all the created directory--select * from Dba_directories;--drop directory is used to delete paths.--drop directory Exp_dir;2. Create a tablespace (

[Email protected] ~]# su-oracle[Email protected] ~]$ Vi/home/oracle/.bash_profile#. Bash_profile# Get the aliases and functionsIf [-f ~/.BASHRC]; Then. ~/.bashrcFi# User specific environment and startup programs#PATH = $PATH: $HOME/binExport

Introduction to Cursors for OracleOracle中的PL/SQL的游标是指把数据库中查询出来的数据以临时表的形式存放在内存中，游标可以对存储在内存中的数据进行操作，返回一条或者一组数据，或者一条数据也不返回。PL/SQL中的记录和表类型虽然也能用来存储数据，但对一组存储在内存中的数据进行操作，还是不太方便，游标恰好是这方面的工具。PL/SQL包含隐含游标和显示游标，其中隐含游标用于处理SELECT

1. Copy the table structure and its data: CREATE TABLE Table_name_new as SELECT * from Table_name_old 2. Duplicate table structure only: CREATE TABLE table_name_new as SELECT * from Table_name_old where 1=2; Or: Create TABLE table_name_new like

Replace variables with bound variables:sql> define x= ' abc '--Defining variablesSql> define XDEFINE X = "abc" (CHAR)sql> select ' &x ' from dual; --Query substitution variable valueOld 1:select ' &x ' from dualNew 1:select ' abc ' from dual' AB---

When creating an index, we often want to estimate the size of the index to assess the impact on the existing project environment, and we also want the process of creating an index to minimize the impact of the project environment we are executing

Oracle lock 4: system lock Oracle databases use multiple system locks to protect internal databases and memory structures. These mechanisms are transparent to users.Latches) Latches are simple and low-level serialization mechanisms that coordinate

Silent uninstalling the Oracle client on WIN7 Environment:WIN 7 + 11.2.0 Client ORACLE_HOMED: \ app \ toshba \ product \ 11.2.0 \ client_1 The process of silently detaching a client is as follows:Command: set ORACLE_HOME=d:\app\toshiba\product\11.2.

[ORACLE] analyzes 23 oracle sessions and performance statements -- View Cluster wait cache busy -- wait for resource buffer busy -- data block consistent read wait SELECT inst_id, event, p1 file_number, p2 block_number, wait_timeFROM gv $

Oracle Import/Export (used more)1. create directory (role system/sys) create directoryHello_fileAs'D: \ dupmfile';-- View all created Directories-- Select * from dba_directories;-- Drop directory. -- Drop directory exp_dir;2. create a tablespace

Basic oracle database operation statementsThis article mainly introduces the basic statements and concepts of oracle database management. 1. How to query the permissions of a role? A. select * from dba_sys_privs where grantee = 'connection' or

Some problems encountered during RH + Oracle installation are worth summarizing Yesterday, when I installed a RH5 + Oracle version in the middle of the night, I encountered several things and stated the following. 1. you need to configure the kernel

Oracle11g adds a control file to the ASM Disk A Control File is one of Oracle physical files. It records the database name, data File location, and other information. The importance of the control file is that the database will go down once the

Rewrite the oraclewm_contact function script. There is a requirement for a recent project to describe consecutive card numbers in one segment, for example, 1, 2, 3, 4, 5, 8, 10, 13, 14, 15, 16, to be displayed as 1-5, 8, 10, 13-16 format However,

How can I use partitions for hierarchical queries of Oracle partition tables? Recently, When I optimized the hierarchical query of a partition table, I found that partitions were not used. I did an experiment and found that partitions could still be

Performance Comparison of Oracle Database date filtering methods When developing SQL statements, filtering date segments is a common problem. How can we efficiently filter out date segments? This article demonstrates through experiments: Method 1:

Method R) R indicates the response time ). The specific definition is as follows: 1. Target the tasks that are critical to the business. 2. Collect properly scoped, un-aggregated profile data for each task while the task is exhibiting the behavior

Oracle database index failure, oracle database index Today, a colleague suddenly asked me why my index failed. To be honest, there are many reasons for failure: However, if the same SQL statement can be used before, indexes cannot be used now. The