procomm plus

, there are exceptions, which are analyzed below)SELECT * from table where?;Current read: Special read operation, insert/update/delete operation, belongs to the current read, need to lock.SELECT * FROM table where? lock in Share mode;SELECT * FROM table where? for update;Insert into table values (...);Update table set? Where?;Delete from table where?;All of the above statements belong to the current read, reading the latest version of the record. Also, after reading, it is necessary to ensure th

Label:There are three common tools for starting and shutting down a database First, Sql*plus In a sql*plus environment, after a user connects to Oracle as SYSDBA , the database can be started or closed by command line mode. Second, OEM (Enterprise Manager) With the OEM database console, you can complete the startup and shutdown operations of the database. Third, RMAN In the recovery Manager (RMAN) environme

AUTOTRACE is a tool in Sql*plus that shows the interpretation plan for the query being executed (explain plan) and theResources. The Autotrace tool is used extensively in this book.There are more than one way to configure Autotrace, the following are the methods I use:(1) CD [Oracle_home]/rdbms/admin;(2) as System login Sql*plus;(3) running @utlxplan;(4) Run create public synonym plan_table for plan_table;(

, reading the latest version of the record. Also, after reading, it is necessary to ensure that other concurrent transactions cannot modify the current record and lock the read record. In addition to the first statement, the read record plus S lock (shared lock), the other operation, plus X lock (exclusive lock). Why insert/Update/delete operations are categorized as current read? You can take a look a

Tags: client usersThe ㈠ command line uses sqlplus syntax to explore. Serial number Command line Examples of usage ① Sqlplus > Sqlplus Ii sqlplus [option] > sqlplus-l ③ Sqlplus [Logon] > sqlplus [email protected] ④ Sqlplus [/nolog] > Sqlplus/nolog ⑤ Sqlplus [start] ① screen prompts for user name, password to connect to the default database② comm

1. Start and Stop a database 1. Start the database 1.1 log on. XX-laptop :~ $ Sqlplus "scott/tiger as sysdba" The following Connection database information is displayed: SQL * Plus: Release 10.2.0.1.0-Production on Mon Aug 9 15:30:16 2010 Copyright (c) 1982,200 5, Oracle. All rights reserved. Connected to an idle instance. SQL> Indicates that you have successfully logged on to the database system. 1.2 start the database. Run the startup command to sta

There are several ways to connect and use an Oracle database, but you typically use the Oracle Sql*plus interface and a set of Sql*plus commands to connect to and use the Oracle database, Sql*plus provides access to the Oracle database interface.This interface is a useful tool for Oracle DBA, and the main reasons are as follows:1. You can use it to run SQL querie

Label:Let's start a new chapter to learn! When an SQL statement is entered, the statement is present in the SQL buffer (that is, a memory area). This SQL buffer is small and can only have one SQL statement, and the SQL statement that was originally in the buffer is overwritten when the next SQL statement is entered. Sql*plus is a tool (environment). As we have seen, we can use it to enter SQL statements. For efficient input and editing of SQL statemen

Millet products Users still envy others have Plus and their own do not? Do not worry, in fact, millet early in the Rice 1 era has been put forward the concept of "Plus". Recently posted a user @ Ducati in hand when the Millet 1 found, millet 1 mobile phone's battery compartment impressively printed on the "Mi-one Plus", but this cell phone is in fact the

IOS: screen adaptation for iPhone 6 and iPhone 6 Plus, iosiphone6 The iPhone 6 and iPhone 6 Plus have been on the market for some time. Although the Chinese mainland has not launched the iPhone 6 and iPhone 6 Plus, it is a treasure for the design change and the big screen era of iPhone 6 and iPhone 6 Plus. Today, we ma

Last time we introduced:SQL/PLUS Study NotesThis section describes the SQL/PLUS learning notes.Edit the current line command in the bufferNext, let's take a look at this part. (1). change (enable you to change the current line) First, use the list command to change the current line (or directly enter the row number, and press enter to change the current line ): SQL> l -- display the buffer content: Sel

The SQL * Plus copy command is used to process mass data replication. For data replication at the database TABLE level, the most common method is CREATE TABLE AS (CTAS. In fact, the copy command under SQL * Plus can do the same job, and it is better, and the performance is also better. What's more, data replication across platforms and heterogeneous databases is supported. The copy command can accomplish so

During the test, it was found that the js data contains the plus sign + and a connection error occurred when it was uploaded to the backend through ajax. Deletion +, and the link was unblocked. It was indeed a problem. Someone raised a bug yesterday to escape the plus sign, I was depressed when I said "B + detective" and "C + detective" couldn't watch the video, because other resources can play the video. W

Set SQL plus AutoTrace Initial Setup1. Step 1: This is what I like to do to get AUTOTRACE working: • cd [ORACLE_HOME]/rdbms/admin www.2cto.com • log into SQL * Plus as SYSTEM • run @ utlxplan • run CREATE PUBLIC SYNONYM PLAN_TABLE FOR PLAN_TABLE; • run GRANT ALL ON PLAN_TABLE TO PUBLIC; 2. step 2 The next step is creating and granting the PLUSTRACE role: • cd [ORACLE_HOME]/sqlplus/admin • log into SQL *

C Primer Plus after reading, primerplus after reading C Primer Plus (Chinese version 6) I searched from my website that this book is suitable for beginners and is a C language book that I can read by myself. So I bought one online. It's really worth the money. I systematically learned the C language through this book, and the code in the book is rarely wrong (some errors are caused by the editor's failure )

Title: ManageEngine Support Center Plus Author: Robert 'xistence 'van Hamburg www.2cto.com (xistence : Http://www.manageengine.com/products/support-center/64045241/ManageEngine_SupportCenter_Plus_7_9_0_SP-0_3_0.ppmWeb site: http://www.manageengine.com/products/support-center/Affected Versions: 7903 and earlierTest System version: CentOS 5 Linux (Windows version also vulnerable, although untested)To fix version: 7905 to the latest = 7908+ Region-++ Reg

At 10 in the morning of this 2014/9/9, you can also watch live broadcasts on the Apple Web site, which you can see with Safari.650) this.width=650; "class=" Alignnone wp-image-5842 "src=" http://www.powenko.com/wordpress/wp-content/uploads/ 2014/09/screen-shot-2014-09-09-at-09.58.25.jpg "alt=" screen Shot 2014-09-09 at 09.58.25 "width=" 560 "height=" 317 "/ >Tim Cook's lead came out,650) this.width=650; "class=" Alignnone wp-image-5847 "src=" http://www.powenko.com/wordpress/wp-content/uploads/

Although this question looks like HDU 1024 Max sum plus, it seems easier than 1024. Previously wa several times, because I started to write DP [22] [maxn] as DP [maxn] [22], orz It seems that arrays out of bounds may not necessarily cause program crash or return an error. DP [I] [J] indicates the maximum number of J numbers that constitute the first I segment. State transition equation: DP [I] [J] = max {DP [I] [J-1], DP [I-1] [J-len [I] + sum [J]-su

"C Primer Plus" Chinese version Sixth editionFrom the website to search for the book for Beginners and self-study can read the C language books, so online bought a copy.Really good value for money, through the book I have learned a very systematic C language, the book code is very few errors (some errors because the editor does not support).The knowledge in this book is comprehensive and detailed, while reading this book is best to run the code again,

Today we see in PHP to calculate the time difference between two times, the following we directly use the Data,strtotime and three functions are implemented, there is a need for friends to refer to. This is the example that needs to be told today. Knowing a date and time, Example: 2012-04-25 10:10:00 I want to add 5 months to this date and time and return to the date of processing. Results: 2012-04-25 10:10:00 plus 5 months equals 2012-09-25 10:10:00