network flow affect the performance

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• Column (varchar2) size does affect the performance of database?

  Hi friends,
  
  I have a table with most of the fields with the varchar2 data type and size of more than 1000. 99% of the scenarios I have no values greater than 100 size column, but as a precaution, I gave more than size. This affects the performance of the database or allocates more space in the tablespace? ...... Or it is fine if I have plus size column since it is a varchar2.
  
  Database: Oracle 11g
  
  Need your advice.
  
  
  
  Kind regards
  Suresh

  On disk, a VARCHAR2 column consumes only the number of bytes required to store the actual data. A string of 4 bytes in a column VARCHAR2 (1000) will consume only 4 bytes of space on the disk.

  Memory is a separate issue. In the structures of memory that deals with blocks (i.e. the cache buffers), blocks are identical to the blocks on the drive, so you would only store 4 bytes in the SGA for the VARCHAR2 field in the row discussed above. When you start writing PL/SQL code, however, Oracle can pre-allocate space for the VARCHAR2 variable. In PL/SQL, Oracle could pre-allocate 1000 bytes if you declare a VARCHAR2 variable (1000). However, Oracle would not pre-allocate memory if you declare a variable VARCHAR2 (3000) (here, the cutoff is 2000 bytes, see this askTom thread).

  Client network and the performance of allocation memory still is another problem. If you have a client application that is fetch data from the database, it has probably declare one large enough to hold the maximum size of each column in the result set, that it is fetching buffer. Related to this, the client application must be able to display the largest size of each field - if you allow a VARCHAR2 column (1000) but the GUI dies if you have over 100 bytes in the field, you have a problem.

  Finally and most importantly, is the model number of database. Columns should be sized to accept the amount of data required. It's a poor practice to declare tons of VARCHAR2 (1000) fields rather than appearing on the actual data size limits you want to apply and declare the columns for these fields sized correctly. Because it would be unwise to have a string of 500 bytes in a column of the CITY in a database, it wouldn't make sense to build a data model that would allow this situation.

  Justin

• a bright blue screen protector will affect the performance of the apple pencil?

  a bright blue screen protector will affect the performance of the pencil on my Pro apple iPad?

  He could.

  With any active bluetooth stylus, it's better to NOT HAVE a shield on an iDevice.

• 'For' loop with a different number of iterations. Second, the auto-indexation of the tables with different sizes is done. It can affect the performance of the Vi?

  Hello

  I have a loop 'for' which can take different number of iterations according to the number of measures that the user wants to do.

  Inside this loop, I'm auto-indexation four different 1 d arrays. This means that the size of the tables will be different in the different phases of the execution of the program (the size will equal the number of measures).

  My question is: the auto-indexation of the tables with different sizes will affect the performance of the program? I think it slows down my Vi...

  Thank you very much.

  My first thought is that the compiler to the LabVIEW actually removes the Matlab node because the outputs are not used.  Once you son upward, LabVIEW must then call Matlab and wait for it to run.  I know from experience, the call of Matlab to run the script is SLOW.  I also recommend to do the math in native LabVIEW.

• Is possible to create a lot of email account on the same computer can affect the performance of the computer or something else?

  Is possible to create a lot of email account on the same computer can affect the performance of the computer or something else?

  Sheman salvation,

  What do you mean by "creates a lot of e-mail account on the same computer?

  I mean after connect hotmail.com let's say, after uttering the 1st email account, so I create another and one more, etc...  can affect the performance of the computer or something else?

  I know that with 1 or 2 email account is sufficient, but I just want to know by I have

  can affect the performance of the computer or something else?

  stuckfree,
  Who is 'Sheman?

  What about your further explanation - it can affect the performance of the computer?

  Together?  Only if you're so low disk space (almost out - the figure even single or double megabytes (MB) area) that everything is affected.  Otherwise - the only performance can affect the messaging application, you use as it POP3, IMAP, Exchange, etc. connects to different e-mail providers at the same time, you need to get your e-mail.  I have three to five settings of accounts on each of my systems (or accounts Hotmail, Gmail, or accounts, corporate, local accounts or accounts ISP, etc.) in Microsoft Outlook and don't encounter any problem.

• so I deleted the pins and now my PC is fine. The number of images pinned to locations affect the performance of the PC?

  I converted to PSE10 to PSE14. I have a little more 14600 Images. Any fine at first, then I allocated 6400 to place pins and my PC slowed down of so many things that I deleted the pins and now my PC is fine. The number of images pinned to locations affect the performance of the PC?

  trevorgatley wrote:

  The reason why I asked is that my items Catalogue 10 has been somehow corrupted during the transfer of items 14 so I deleted and started re-marking all my photos, which many others who previously were not moved in elements

  You keep a copy of your old folder from catalog PSE10 somewhere? It is often possible to get a usable conversion by creating a new folder from catalog containing only the database file 'catalog.pse10db '. Who restores the keywords, ratings, the batteries of legends and notes, not version games or albums.

  I would also like to hear if there is a problem of comon or perhaps introduced by an error on my part.

  Other posts in this forum and the forum of comments, I'm willing to bet that there is a real problem and no error on your part.

  I talked about Internet connection because the geotagging feature is dependent on the Google Maps application.

• VCA Mode affect the Performance?

  I enabled on my AMD based blade Cluster.  Once I did, but I had a few complaints today claiming a general slowness on their desktop from view.

  These are older blades but now run our test environment seen for quite awhile without complaints.  Today, I added a more recent blade but was to turn VCA AMD Opteron Gen 2.

  3 blades are AMD Opteron 8218 and my 4th I've added today's Opteron 8356...

  Pourriez this cause on the virtual machine slow?

  VCA is used to differences of capacity CPU mask and should not affect the performance. http://KB.VMware.com/kb/1005764

• East-audio/video or advertising photos in the tab 'not open' affect the performance of Firefox?

  From what I understand the audio Forum leaking by a tab can be cut. This means that the most important activity such as periodic updates on a page to download advertisements could also affect Firefox performance even if the tab has not been clicked. Is this true?

  Once the tab has been loaded, any video or audio active in this tab will have a negative impact on the performance of Firefox.

  In the options, you can tell Firefox to not load the tab until it is selected, but once you select the tab for the first time, the site will remain responsible.

• power button will affect the performance of the system

  Mr President.

  I was forced to use the power button to turn off my laptop HP 2231tx G6 in certain circumstances. I would like to know if this will affect all my gear system & impact on its performance. Because mine is only a new system.

  Using the power button to turn off the computer will not affect the system hardware or your computer's performance. It can, however, lead to the system indicates that it "didn't stop in properly" and may require the system to the performance of a hard disk check before starting entirely. In addition, you can lose data by turning off the computer by this means.

  If you have any other questions, feel free to ask.

  Please click the White Star of KUDOS to show your appreciation

• Should we leave how much free space on the C drive before affecting the performance and speed?

  Hello!

  Hard drive of my new PC (C) is 1 TB (processor Samsung 7i, Windows 8.1). It doesn't have any other disk/partition. How this space is safe to use to store large files (videos, esp., stored in the native video library file) without harming the performance and speed?

  And if I create another partition (D) and just use it for storage, it will make much difference compared to the above?

  Thank you!

  Anna

  Sunday, March 1, 2015 10:59 + 0000, AnaFilipaLopes wrote:

  And if I create another partition (D) and just use it for storage, it will make much difference compared to the above?

  Planning your Partitions

  The Question

  Partitions, how much should I have on my hard drive, what do I use
  each of them for, and what size should each one be?

  It s a common question, but unfortunately this doesn t have a
  only simple, just answer to all the world. A lot of people will respond with
  the way they do, but their response isn't necessarily best for the
  person seeking (in many cases it isn't right even for the person)
  response).

  Terminology

  First, let's rethinking the terminology. Some people ask "should I".
  partition my drive? That s the wrong question, because the
  the terminology is a little strange. Some people think that the word
  "partition" means divide the drive into two or more partitions.
  That s not correct: to partition a drive is to create one or several
  partitions on it. You must have at least one partition to use
  He who think they have an unpartitioned disk actually
  have a player with only one partition on it and it s normally
  Called C:. The choice you have is to have more than one
  partition, not that it's the partition at all.

  A bit of history

  Back before Windows 95 OEM Service Release 2 (also known as Windows
  95 (b) was published in 1996, all MS-DOS and Windows hard drives have been set
  using the file system FAT16 (except for very tiny to aid
  FAT12). That 16-bit only because were used for addressing, FAT16 has a
  maximum 2 GB partition size.

  More than 2 GB of hard disks were rare at the time, but if you had
  one, you must have multiple partitions to use all the available
  space. But even if your drive was not larger than 2GB, FAT16 created
  Another serious problem for many people - the size of the cluster has been
  more great if you had a larger partition. Cluster sizes increased from 512
  bytes for a partition to no greater than32Mb all the way up to 32 KB for a
  partition of 1 GB or more.

  More the cluster size, the space more is wasted on a hard drive.
  That s as space for all the files is allocated in whole clusters
  only. If you have 32 KB clusters, a 1 byte file takes 32 KB, a file, a
  greater than 32 k byte takes 64 k and so on. On average, each file
  about half of his last group waste.

  If large partitions create a lot of waste (called "soft"). With a 2 GB
  FAT16 drive in a single cluster, if you have 10,000 files, each
  lose half a cluster of 32 KB, you lose about 160 MB for relationships. This s
  back in an important part of a player that probably cost more than $400
  1996 - around $ 32.

  So what did the people? They divided their 2 GB drive in two,
  three or more logical drives. Each of these logical drives has been
  smaller the real physical disk, had smaller clusters, and
  so less waste. If, for example, she was able to keep all the partitions
  less than 512 MB, cluster size was only 8 KB, and the loss was reduced to a
  a quarter of what it would be otherwise.

  People partitioned for other reasons also, but back in the days of
  FAT16, it was the main reason to do so.

  The present

  Three things have changed radically since 1996:

  1. the FAT32 and NTFS file systems came along, allowing a larger
  partitions with smaller clusters and so much less waste. In
  with NTFS, cluster sizes are 4 K, regardless of the size of the partition.

  2 hard drives have become much larger, often more than 1 TB (1000 GB) in
  size.

  3 hard drives have become much cheaper. For example, a 500 GB drive
  can be bought today for about $50. That s 250 times the size of this
  Player 2Gb typical 1996, about one-eighth of the price.

  What these things mean together which is the reason to be old to have
  multiple partitions to avoid the considerable wastage of disk space left.
  The amount of waste is much less than it used to be and the cost of
  that waste is much less. For all practical purposes, almost nobody does
  should no longer be concerned about slack, and it should no longer be
  has examined when planning your partition structure.

  What Partitions are used for today

  There are a variety of different ways people put in place several
  scores of these days. Some of these uses are reasonable, some are
  debatable, some are downright bad. I'll discuss a number of Commons
  partition types in the following:

  1. a partition for Windows only

  Most of the people who create such a partition are because they believe
  If they never have to reinstall Windows properly, at least they
  He won t lose their data and he won t have to reinstall their applications.
  because both are safe on other partitions.

  The first of these thoughts is a false comfort and the second
  is downright bad. See the analysis of the types of partition 2 and 4
  below to find out why.

  Also note that over the years, a lot of people who find their windows
  partition that has begun to be the right size proves to be too
  small. For example, if you have such a partition for Windows and later
  upgrade to a newer version of Windows, you may find that your Windows
  partition is too small.

  2. a partition for installed programs

  This normally goes hand in hand with the partition type 1, a partition for
  just Windows. The thought that if you reinstall Windows, your
  installed application programs are safe if they are in another
  partitions is simply not true. That s because all programs installed
  (with the exception of an occasional trivial) have pointers to the inside
  Windows, in the registry and elsewhere, as well as associated files
  buried in the Windows folder. So if Windows, pointers and
  the files go with it. Given that the programs need to be reinstalled if Windows
  the fact, this reasoning to a separate partition for programs not
  work. In fact, there is almost never a good reason to separate
  Windows of the software application into separate partitions.

  3. a partition for the pagefile.

  Some people think mistakenly that the pagefile on another
  score will improve performance. It is also false; It doesn t
  help and often I hurt, performance, because it increases the movement of the head
  to get back to the page to another file frequently used
  data on the disk. For best performance, the paging file should normally
  be on the most widely used score of less used physical player. For
  almost everyone with a single physical disk than the same drive s
  Windows is on C:.

  4. a partition for backup for other partitions.

  Some people make a separate partition to store backups of their other
  or partitions. People who rely on a "backup" are a joke
  themselves. It is only very slightly better than no backup at all.
  because it leaves you likely to be simultaneously the original losses
  and backup for many of the most common dangers: the head crashes and other
  types of drive, serious glitches to power failure, near lightning
  strikes, virus attack, even stolen computer.  In my opinion,.
  secure backup must be on a media removable and not stored in the
  computer.

  5. a partition for data files

  Above, when I discussed separate Windows on a clean partition,
  I pointed out that separate data from Windows is a false comfort if
  He of done with the idea that data will be safe if Windows ever
  must be reinstalled. I call it a false comfort that's because
  I'm afraid many people will rely on this separation, think that their
  data are safe there and so do not take measures to
  Back it up. In truth the data is not safe there. Having to reinstall
  Windows is just one of the dangers to someone a s hard disk and not
  probably even one. This kind of "backup" falls into the same
  category, as a backup to other partitions partition; It lets you
  sensitive to the simultaneous loss of the original and the backup on many of
  the most common dangers that affect the entire physical disk, not
  just the particular partition. Security comes from a solid backup
  diet, not how partition you.

  However, for some people, it may be a good idea to separate Windows and
  programs on the one hand of the data on the other, putting each of the
  two types into separate partitions. I think that most people
  partitioning scheme must be based on their backup system and backup
  plans are generally of two types: whole hard disk imaging
  or data only backup. If you back up data, backup is
  usually facilitated by the presence of a separate with data only partition;
  to save just the score easily, without having to
  collect pieces from here and elsewhere. However, for
  those who backup by creating an image of the entire disk, there is
  usually little, if any, benefit the separation of data in a partition of
  its own.

  Furthermore, in all honesty, I must point out that there are many
  very respected people who recommend a separate partition for Windows,
  Whatever your backup plan.  Their arguments haven t convinced
  me, but there are clearly two views different here.

  6. a partition to image files

  Some people like to deal with the images and videos as something separate
  other data files and create a separate partition for them. To my
  the spirit, an image is simply another type of data and there is no
  the advantage in doing so.

  7. a partition for music files.

  The comments above related to the image files also apply to music
  files. They are just another type of data and must be dealt with the
  just like the other data.

  8. a partition for a second operating system to dual-boot to.

  For those who manage several operating systems (Windows Vista, Windows
  XP, Windows 98, Linux, etc.), a separate partition for each operating
  system is essential. The problems here are beyond the scope of this
  discussion, but simply to note that I have no objection to s
  all these partitions

  Performance

  Some people have several partitions because they believe that it
  somehow improves performance. That s not correct. The effect is
  probably low on modern computers with modern hard disks, but if
  whatever it is, the opposite is true: more music mean poorer
  performance. That's because normally no partition is full and it
  so are gaps between them. It takes time for the drive s
  read/write heads to cross these gaps. Close all files
  are, faster access to them will be.

  Organization

  I think a lot of people overpartition because they use scores as a
  organizational structure. They have a keen sense of order and you want to
  to separate the apples from the oranges on their readers.

  Yes, separating the different types of files on partitions is a
  technical organization, but then is to separate different types of
  files in folders. The difference is that the walls are static and
  fixed in size, while the files are dynamic, changing size automatically
  as needed to meet your changing needs. This usually done records
  a much better way to organize, in my opinion.

  Certainly, partitions can be resized when necessary, but except with the latter
  versions of Windows, which requires a third-party software (the and the
  possibility to do so in Windows is primitive compared to the third-party
  solutions). These third party software normally costs money and not
  any point and how stable it is, affects the entire disk.
  with the risk of losing everything. Plan your partitions in
  first place and repartitioning, none will be necessary.  The need
  to repartition usually occurs as a result of overpartitioning in
  the first place.

  What often happens when people organize with partitions instead
  records are that they make a miscalculation of how much room they need on each
  This partition, and then when they run out of space on the partition
  When a file is logically, while having plenty of space
  on the other hand, they simply saving the file in the score of "poor".
  Paradoxically, therefore, results in this kind of score structure
  less organization rather than more.

  So how should I partition my drive

  If you read what came before, my findings will not come as a
  surprise:

  1. If your backup set is the image of the entire disk, have just one
  single (usually c partition :));

  2. If you backups just data, have two partitions one for Windows and
  application programs installed (usually c :)), the other for data
  (normally D :).)

  With the exception of multiple operating systems, it is rarely
  any advantage to have more than two partitions.

• DBMS_STATS.gather_table_stat will affect the performance of the database

  Hi all

  Please notify dbms_stats.gather_table_stat so on to materialize views will monopolize the database performance?

  Hello

  your question is not very accurate, it is not possible to answer more specifically. Collection of statistics requires resources, so it inevitably affects the activities of database performancewise. How it affects the rest of the database, is hard to say without knowing the parameters of the stats gathering work and the number and the size of scanned objects.

  Once statistics are collected their effect is most likely beneficial for the performance, but in some cases the effect can be reversed. This depends on whether or not current performance problems are related or statistical, and whether or not the statistical model Oracle can adequately describe the distribution of the data.

  Stats more important questions can help answer is whether an index can be beneficial for a query. So, if your MV index, then get specific statistics become even more important.

  Best regards

  Nikolai

• How autoextend affects the performance of a large data load

  I do a little reorganisation on a data warehouse, and I need to move almost 5 to a value of tables and rebuild their indexes. I create a tablespace por each month, using BIGFILE tablespaces and assigning to their 600GO, which is the approximate size of the tables for each month. Just space allocation process takes a long time, and I decided to try a different approach and replace the AUTOEXTEND ON NEXT 512 M data file, and then run the ALTER TABLE MOVE command to move the tables. Is the Oracle 11 g Release 2 database, and it uses ASM. I was wondering what would be the best approach between these two:
  
  1. create the tablespace with AUTOEXTEND OFF, set it to 600GO and then run the command ALTER TABLE MOVE. The space would be enough for all the tables.
  
  2. create the tablespace with AUTOEXTEND ON and without affecting more than 1 GB, run the command ALTER TABLE MOVE. The diskgroup has enough space for the expected size of the storage space.
  
  With the first approach my database takes 10 minutes, moving from each partition (there is one for each day of the month). Would that number be affected dramatically if the database must be an AUTOEXTEND each 512 MB?

  If you measure the performance as the time required to assign the initial data to 600GO file more time to load and compare this to allocate a small file and to load, leaving the autoextend data file, it is unlikely that you will see a noticeable difference. You will get a variation much more just to move 600 GB you will lose waiting on the database to expand. If there is a difference, affect the whole of the file at the front will be slightly more efficient.

  More likely, though, is that you don't count the time required to assign the initial 600GO data file since it is something that can be done long in advance. If you do not count this year, then distribute the entire file at the front will be much more effective.

  If you need less than 600 GB, on the other hand, allocating the entire file at once can lose very little space. If it is a matter of concern, it may be wise to compromise and to allocate a 500 GB file initially (assuming it's a lower limit of reasonable size you actually need) and let the file into pieces of 1 GB. This is not the most effective approach and you can waste up to a GB of space, but maybe it's a reasonable compromise.

  Justin

• Low power mode will affect the performance of the camera?

  I take my iPhone 6 on a trip backpack my camera. I intend to put the phone in airplane mode and I wonder if I should also set low power mode. If I put it in low power mode, it will reduce the performance of the camera?

  I suggest that you test this configuration by yourself before you leave.

  You can also consider taking the external battery back up like those manufactured by mophie.

• Win 7 (Pro) - can delete all the temporary files in the folder %Temp% affect the performance of the PC?

  Hello

  All files in %Temp% are useful?

  Some people said that removing all the files in %Temp% could help solve some problem of PC as a network problem, speed etc.

  This practice can cause the PC to have a blue screen crash?

  Thank you

  "If you want to reduce the number of unnecessary files on your hard disk to free up disk space and help your computer run faster, use disk cleanup. It removes temporary files, empty the Recycle Bin, and removes a variety of file system and other items that you no longer need. " - of - http://windows.microsoft.com/en-us/windows/delete-files-using-disk-cleanup#delete-files-using-disk-cleanup=windows-7

  It will be useful.

• See the number of rows affected the performance of sqlplus to a sql file

  Hello

  It's just we have a sql file that contains a bunch of select/update/insert statements.

  I have a unix script that calls sqlplus on this sql file. However, at the exit I don't get the number of rows affected.

  Without adding any code in the input sql file, how can I change the code of sqlplus shell script to print the number of rows affected for each statement in the sql file?

  ${ORACLE_HOME}/bin/sqlplus -L >> ${LOG_FILE} 2>&1  << EOF
    ${ORAID}/${ORAPASS}@${ORAINS}
    whenever sqlerror exit sql.sqlcode;
    set echo on;
    set feedback off;
    set serveroutput on;
    @${SQL_FILE};
    exit;
  EOF
  RC=$?
  

  The SQL_FILE of entry content is:

  select 12 "col1" from dual;
  select 'abcd' "col2" from dual;
  select;
  select 13 'col3' from dual;
  

  The result of the race of sqlplus is (LOG_FILE):

  SQL*Plus: Release 11.2.0.2.0 Production on Fri Jun 6 14:28:00 2014
  
  Copyright (c) 1982, 2010, Oracle.  All rights reserved.
  
  Enter user-name: 
  Connected to:
  Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
  With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
  Data Mining and Real Application Testing options
  
  SQL> SQL> SQL> SQL> SQL> SQL> select 12 "col1" from dual;
  
        col1
  ----------
          12
  SQL> select 'abcd' "col2" from dual;
  
  col2
  ----
  abcd
  SQL> select;
  select
       *
  ERROR at line 1:
  ORA-00936: missing expression
  
  
  Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
  With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
  Data Mining and Real Application Testing options
  

  Thank you

  Srinivas - y.

  1. echo setting
  2. Set feedback off;

  use

  Set of feedback on