gridcontrol devexpress current rows

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On ROWNUM and Limiting Results

On ROWNUM and Limiting Results By Tom Kyte Our technologist explains how ROWNUM works and how to make it work for you. This issue's Ask Tom column is a little different from the typical column. I receive many questions about how to perform top-N and p

Examples of questions to judge oracle tkprof

Question to judge: 1. Query + current / rows per block required for the number of lines, too, then (over 20) SQL statement efficiency is too low 2. Parse count / Execute count parse count should be close to 1, if too high, SQL would be unnecessary re ...

oracle view the SQL execution plan parameters analysis

sql_trace been tracking the implementation plan: Call Count CPU Time Elapsed Time Disk Query Current Rows ------- ------ -------- ------------ ---------- ------- --- ---------- ---------- Parse 1 0.000 0.000 0 0 0 0 Execute 1 0.000 0.000 0 0 0 0 Fetch 481

Tkprof: analysis of trace file ORACLE

Tkprof: ORACLE trace file analysis and produce a more humane clear output executable tool 2009-10-19 16:25 TKPROF to use the steps 1. Set the parameter file Set the three parameters timed_staticstices user_dump_dest max_dump_file_size timed_staticstices a

oracle SQL Tracking: sql_trace and 10 046 events

SQL trace settings to SQL_TRACE very simple, SQL_TRACE is a parameter, only in the session layer, set it to TRUE, to usher in a SQL trace, Oracle SQL statement will be the implementation of records to trace file. Through access to trace files, will help y

oracle SQL trace: sql_trace and 10 046 events

To follow a very simple SQL SQL_TRACE Shezhi, SQL_TRACE is a parameter, only need to Zai session Cengjiang set it to TRUE, the Kai Qi Liao SQL Tracking, Oracle will be the implementation of the SQL statement Guochengjilu Dao Genzongwenjian in. Through acc

Improve the query efficiency with Bulk Collect

Oracle8i introduced the Bulk Collect the first time feature, this feature can enable us to PL / SQL, can use batch queries, batch queries in some cases can significantly improve query performance. Now, the properties of some simple testing and analysis. 1

drop table report ora-00942 table or view does not exist / / SQL_TRACE basic usage

Oracle Case for diagnosis using Sql_trace Description of the problem: Very often, when we carry out database operations, such as drop user, drop table, etc., often encounter this error ORA-00604: error occurred at recursive SQL level 1. This prompted a lo

A sql statement sql trace results

SQL ID: 88hy0pwj7wd6t select count (*) from t_record call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- --------- - ---------- ---------- Parse 1 0.00 0.00 0 0 0 0 Execute 1 0.00 0.00 0 0 0 0 Fetch 2 0.00 0.0

fetchSIze impact on performance

class DemoPrefetch { public static void main(String[] args) { int connLevelDefaultPrefetch = 5; int stmtLevelFetchSize = 20; int rsetLevelFetchSize = 50; Connection conn = null; try { conn = JDBCUtil.getConnection("fuyou", "fuyou", "orcl"); System.ou

Inside and outside the loop to create statment main contrast

class DemoParse { public static void main(String args[]) throws Exception { Connection conn = null; PreparedStatement pstmt = null; PreparedStatement pstmt1 = null; ResultSet rset = null; ResultSet rset1 = null; // first parameter: database name try { //

Detailed implementation plan is a process

1. Sys users are: check the current instance of the number of user sessions Particular attention to query the user's information, such as I am now Scott Users select sid, paddr, user #, username, serial # from v $ session; SID PADDR USER # USERNAME SE

EXISTS / NOT EXISTS must be better than IN / NOT IN the efficiency of the high?

Often people say EXISTS faster than the IN! Faster than NOT IN NOT EXISTS! What, however, this really true? We first discuss the IN and EXISTS. select * from t1 where x in (select y from t2) In fact can be understood as: select * from t1, (select distinct

Oracle hidden parameters from the open to extend _db_block_max_cr_dba

Today when I see an implicit parameter _db_block_max_cr_dba, Oracle explained that it Maximum Allowed Number of CR buffers per dba The default value is 6. Despite the weekend, and sometimes itchy to do one of their test to see whether it is doing wit

and exists in different

Often than people say EXISTS IN fast! Faster than NOT IN NOT EXISTS! However, this really true it? We first discuss the IN and EXISTS. select * from t1 where x in (select y from t2) In fact can be understood as: select * from t1, (select distinct y from t

Streams Study II (clear flow configuration)

Streams after the completion of the deployment, if you need to reconfigure or discard configuration, you can choose to clear the configuration information. The steps of this clearance is very simple, just as a command: EXEC DBMS_STREAMS_ADM.REMOVE_ST

TKPROF use of learning

Tkprof tools are available to format the sql trace file generated, so you more easily understand the contents of trace Usage: tkprof tracefile outputfile [explain =] [table =] [print =] [insert =] [sys =] [sort =] ... Parameters: tracefile: you have to an

Oracle hidden parameters _db_block_max_cr_dba extension from the open to

Today I see an implicit argument _db_block_max_cr_dba, Oracle explained that it Maximum Allowed Number of CR buffers per dba The default value is 6. Although the weekend, and sometimes itchy to do one of their test to see whether it is doing with the

difference between in and exists

Often people say EXISTS faster than the IN! Faster than NOT IN NOT EXISTS! However, what this really true? We first discuss the IN and EXISTS. select * from t1 where x in (select y from t2) Fact can be understood as: select * from t1, (select distinc

Oracle Streams to learn two (clear stream configuration)

Streams after the completion of the deployment, if you need to reconfigure or discard the configuration, you can choose to clear the configuration information. This cleanup step is very simple, just as a command: EXEC DBMS_STREAMS_ADM.REMOVE_STREAMS_

Help users to solve a problem

Lonely Cheng (116343798) 21:58:13 SQL query table space is very slow Encountered a system table space query the remaining space, the slow velocity anomalies, the following information is 10046, we encountered a similar phenomenon? A bug? AIX: 5.3.0.8

[Zt] used to track sessions and tkprof event10046

First, using the 10046 trace events In many cases, the database performance diagnostic methods can use SQL Trace, some information recorded in the trace file after the analysis. Under normal circumstances we can SQL_TRACE = TRUE initialization parame

oracle SQL Trace: sql_trace and 10046 events

[Transfer] http://wjhaishun.iteye.com/blog/657083 [More fully] http://www.sudu.cn/info/html/edu/20070101/283645.html This is a global alter system set sql_trace = true alter system set sql_trace = false SQL_TRACE set the SQL Trace is very simple, SQL

lead to changes in flashback table rowid

First look at the test SQL> create table test_move as select * from dba_users; Table created. SQL> create user zhoul identified by zhoul; User created. SQL> grant dba to zhoul; Grant succeeded. SQL> conn zhoul / zhoul Connected. SQL> c

Select all of the current page checkbox, calculate the number of rows the current page and total number of rows GridView

The following code implements the following main features: 1 Select choseAll (checkbox), the current page choseAll out all the checkbox are selected 2 Calculate the number of rows the current page and display the text box at the bottom left hand corner 3

devexpress of VGridControl Cell background color of the custom

The following figure shows the comparison based on the current value of the maximum and minimum change the background color of a Cell instance. VGridcontrol set the background color is not as normal as can gridcontrol property operations, but through

The existence of i, so n * n matrix of i rows are 1, i columns are 0 (except the intersection)

Requirements: complexity is O (n) Analysis: If there is i, then i have and the only one. Algorithm: (1) to find the possible i. From a [1] [1] departure, determine whether the current element is 0. If it is not the right move, until the cross-border, ...

View the current character set of parameters mysql

View the current character set of parameters mysql Enter show variables like 'character \ _set \ _%'; The results shown below +--------------------------+--------+ | Variable_name | Value | +--------------------------+--------+ | Character_se ...

Also a date input control, you can enter the current time

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title> has a date input control, you can enter the current time </ title> </ Head> <body> <form name= ...

Control various database query number of rows of sql statement

SqlServer select top 10 * from tablename; Informix select first 10 * from tablename; Oralce select * from tablename where rownum <= 10; MySql SQL1 select * from tableName limit 10 SQL2 select t.user_id, random () as Random from udb_user t limit 10 ...

(Transfer) Developer Express controls portfolio GridControl control

1 ************************************** Developer Express controls portfolio GridControl control, how to automatically display the serial number of each line? For example, 10 data records, I want to record next to 1.2.3.4. Such figures. However, if ...

GridView for the current row

GridView control is in use, we often come across for the current row index number of operations carried out by the index. For example, one can get the current row control element; set the value of a certain element and so on. The following were introduced

Based on the number of rows under the row and fill in the number of

Based on the given row number 10, filled out in its next row of numbers corresponding to 10, the request is the number of rows each corresponding position on the row number of the next row of the number of occurrences. On the row number: 0,1,2,3,4,5,6,7,8

Javascript refresh the current page

Javascript refresh the current page The following were named to three pages frame.html, top.html, bottom.html example to specify what to do. frame.html from top (top.html) under (bottom.html) composed of two pages, the code is as follows: <!DOCTYPE HTM

DevExpress control of XtraTreeList

DevExpress controls, where recent projects useful to the really powerful features, previously on the arrival of a control vs control comes with a few, regarded as a composite control. XtraTreeList control down today to use notes 1.treeList1 binding d

Devpress.XtraGrid.GridControl.GridView property

Since the format because you can download the attachment to read the inconvenience Book1.zip (10.5 KB) (ApplicationSettings) general properties (Name) general properties (PropertyBinding) allows the use of conventional property ActiveFilterEnabled filteri

Calculate the total number of rows GridView

ChoseAll.aspx: <% @ Page Language = "vb" AutoEventWireup = "false" CodeBehind = "ChoseAll.aspx.vb" Inherits = "GridView20070201.ChoseAll"%> <! DOCTYPE html PUBLIC "- / / W3C / / DTD XHTML 1.0 Transitio

SQL Server to take the current system time, change time

getdate / / get the current system date datepart / / Get the specified date part (year, month date hours of table) getdate () function: get the current system date and time. Return value is of type datetime. Usage: getdate () Example: select getdate

[SQL Server] database size, table size and number of rows Statistics

Quote - A table space statistics, the number of rows of information EXEC Your_DB.dbo.sp_spaceused 'dbo.t_log'; - Statistics more than one table space than the size of the database, the number of rows of information create table tmp_table_space (ta

linux statistics the number of files under the current directory

View the number of files under the current directory ls-l | grep "^ -" | wc-l View the number of files under the current directory, including subdirectories inside. ls-lR | grep "^ -" | wc-l View a directory folder (directory) num

[Turn] control the various rows of a database query sql statement

SqlServer select top 10 * from tablename; Informix select first 10 * from tablename; Oralce select * from tablename where rownum <= 10; MySql SQL1 select * from tableName limit 10 SQL2 select t.user_id, random () as Random from udb_user t limit 10

Use ls to view the file number of the current directory

View the number of files under the current directory ls-l | grep "^ -" | wc-l View the number of files under the current directory, including subdirectories inside. ls-lR | grep "^ -" | wc-l View a directory folder (directory) num

SQL Server to take the current time, time change

getdate / / get the current system date datepart / / get the date specified part (year, month, day, hour table) getdate () function: get the current system date and time. Return value of datetime type. Usage: getdate () Example: select getdate () as dte,

Modify the oracle for the current session language environment, to solve the problem of garbled display Chinese oracle

Sometimes when the ORACLE database, suggesting that a string???, Can not play the role of prompt, which is due to the language settings in the environment, the following is the actual operation to use. View the current session of the language environ

javascript to determine the current browser and operating system version

javascript to determine the current browser and operating system version

Reconstruction, the suitability of "current" development model?

When I read MF's "Reconstruction," when such questions. Whether it is suitable? In order to reduce the controversy here, I note some of the details about. A system in the SPRING + STRUTS2 + HBIERBATE under the framework of development. ...

swing control of the number of rows in the JTextArea

http://blog.csdn.net/findhappy7/archive/2008/05/08/2417490.aspx Recently made a tool used to verify that something to open multi-threaded validation, the verification process in some of the results output to JTextArea panel knew TextArea does not pro ...

java get current path

Some on-line induction to take JAVA path method: Stated: If you start from the ANT program, this.getClass (). GetResource ( "") to take out more strange, the direct use of JAVA command-line debugger can be successful. Classpath and the curr ...

Android detect current network is available

Networking software, networking before the general should detect whether the network is available Here is the code

The system current time Calendar

The system current time Calendar
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