barcodes in crystal reports 2008 Setting PCTFREE and PCTUSED Values in Font

Encoder Data Matrix 2d barcode in Font Setting PCTFREE and PCTUSED Values

Setting PCTFREE and PCTUSED Values
ECC200 Drawer In None
Using Barcode generation for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
www.OnBarcode.com
Make Code 3/9 In None
Using Barcode creation for Font Control to generate, create ANSI/AIM Code 39 image in Font applications.
www.OnBarcode.com
Setting PCTFREE and PCTUSED is an important and greatly overlooked topic. In summary, PCTUSED and PCTFREE are both crucial when using MSSM; with ASSM, only PCTFREE is. On one hand, you need to use them to avoid too many rows from migrating. On the other hand, you use them to avoid wasting too much space. You need to look at your objects and describe how they will be used, and then you can come up with a logical plan for setting these values. Rules of thumb may very well fail you on these settings; they really need to be set based on usage. You might consider the following (keeping in mind that high and low are relative terms, and that when using ASSM only PCTFREE applies): High PCTFREE, low PCTUSED: This setting is for when you insert lots of data that will be updated and the updates will increase the size of the rows frequently. This setting reserves a lot of space on the block after inserts (high PCTFREE) and makes it so that the block must almost be empty before getting back onto the freelist (low PCTUSED). Low PCTFREE, high PCTUSED: This setting is for if you tend to only ever INSERT or DELETE from the table, or if you do UPDATE, the UPDATE tends to shrink the row in size.
Universal Product Code Version A Creator In None
Using Barcode generation for Font Control to generate, create UCC - 12 image in Font applications.
www.OnBarcode.com
Printing GS1-128 In None
Using Barcode encoder for Font Control to generate, create USS-128 image in Font applications.
www.OnBarcode.com
LOGGING and NOLOGGING
Make PDF 417 In None
Using Barcode creation for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
Generate Data Matrix ECC200 In None
Using Barcode creator for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
www.OnBarcode.com
Normally objects are created in a LOGGING fashion, meaning all operations performed against them that can generate redo will generate it. NOLOGGING allows certain operations to be performed against that object without the generation of redo; we covered this in the last chapter in some detail. NOLOGGING affects only a few specific operations, such as the initial creation of the object, or direct path loads using SQL*Loader, or rebuilds (see the Oracle SQL Reference manual for the database object you are working with to see which operations apply). This option does not disable redo log generation for the object in general only for very specific operations. For example, if I create a table as SELECT NOLOGGING and then INSERT INTO THAT_TABLE VALUES ( 1 ), the INSERT will be logged, but the table creation might not have been (the DBA can force logging at the database or tablespace level).
GS1 - 13 Drawer In None
Using Barcode maker for Font Control to generate, create EAN / UCC - 13 image in Font applications.
www.OnBarcode.com
ISSN Creation In None
Using Barcode creator for Font Control to generate, create ISSN - 13 image in Font applications.
www.OnBarcode.com
CHAPTER 10 DATABASE TABLES
Generate DataMatrix In Java
Using Barcode generator for Android Control to generate, create DataMatrix image in Android applications.
www.OnBarcode.com
Data Matrix 2d Barcode Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
INITRANS and MAXTRANS
Recognizing DataMatrix In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Printing EAN13 In None
Using Barcode encoder for Online Control to generate, create European Article Number 13 image in Online applications.
www.OnBarcode.com
Each block in a segment has a block header. Part of this block header is a transaction table. Entries will be made in the transaction table to describe which transactions have what rows/elements on the block locked. The initial size of this transaction table is specified by the INITRANS setting for the object. For tables, this defaults to 2 (indexes default to 2). This transaction table will grow dynamically as needed up to MAXTRANS entries in size (given sufficient free space on the block, that is). Each allocated transaction entry consumes 23 to 24 bytes of storage in the block header. Note that as of Oracle 10g, MAXTRANS is ignored all segments have a MAXTRANS of 255.
Barcode Creation In Java
Using Barcode encoder for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
EAN13 Generator In None
Using Barcode drawer for Software Control to generate, create EAN 13 image in Software applications.
www.OnBarcode.com
Heap Organized Tables
QR Code Drawer In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create QR-Code image in .NET framework applications.
www.OnBarcode.com
GS1 - 13 Generator In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create GS1 - 13 image in ASP.NET applications.
www.OnBarcode.com
A heap organized table is probably used 99 percent (or more) of the time in applications, although that might change over time with the advent of IOTs, since they can themselves be indexed. A heap organized table is the type of table you get by default when you issue the CREATE TABLE statement. If you want any other type of table structure, you need to specify that in the CREATE statement itself. A heap is a classic data structure studied in computer science. It is basically a big area of space, disk, or memory (disk in the case of a database table, of course), which is managed in an apparently random fashion. Data will be placed where it fits best, rather than in any specific sort of order. Many people expect data to come back out of a table in the same order it was put into it, but with a heap, this is definitely not assured. In fact, rather the opposite is guaranteed: the rows will come out in a wholly unpredictable order. This is quite easy to demonstrate. In this example, I will set up a table such that in my database I can fit one full row per block (I am using an 8KB blocksize). You do not need to have the case where you only have one row per block I am just taking advantage of that to demonstrate a predictable sequence of events. The following sort of behavior (that rows have no order) will be observed on tables of all sizes, in databases with any blocksize: ops$tkyte@ORA10GR1> create table t 2 ( a int, 3 b varchar2(4000) default rpad('*',4000,'*'), 4 c varchar2(3000) default rpad('*',3000,'*') 5 ) 6 / Table created. ops$tkyte@ORA10GR1> insert into t (a) values ( 1); 1 row created. ops$tkyte@ORA10GR1> insert into t (a) values ( 2); 1 row created. ops$tkyte@ORA10GR1> insert into t (a) values ( 3); 1 row created.
Read QR-Code In Visual Studio .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Scanning Barcode In Visual Studio .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Drawer In VB.NET
Using Barcode maker for .NET framework Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Generate Data Matrix In Java
Using Barcode creation for BIRT reports Control to generate, create DataMatrix image in BIRT applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.