If i encrypted a large data using rsa,what i can do
if i encrypted a large data,the date size > 1024(rsa keysize),the type of data is
byte[],what i can do
You'll have to block it yourself, and encrypt each block on its own. On the decrypt side, your algorithm needs to expect a series of blocks, and it needs to decrypt them each and rebuild the original plaintext. It's not hard - but you're in for some tedious times with byte[].
And you'll end up with something that runs at a snail's pace - but at least the security will be weaker! It's a very bad answer to encryption. I realize that you know that - but feel free to tell whoever is requiring you to be stupid, that what they're asking you to do is stupid. ;)
Grant
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How to encrypt excel file data using triple DES algorithm in oracle
Hi,
I would like to know the process or script to encrypt/decrypt the excel file data using triple DES algorithm in oracle.I'm not quite sure your requirement.... do you mean when uploading files to be stored in the database ?
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Spooling large data using UTL_FILE
Hi Everybody!
While spooling out data into a file using UTL_FILE package I am unable spool the data The column data has a size of 2531 characters
The column 'source_where_clause_text' has very large data.
Its not giving any error but the external table is not returning and data
Following is the code.
CREATE OR REPLACE PROCEDURE transformation_utl_file AS
CURSOR c1 IS
select transformation_nme,source_where_clause_text
from utility.data_transformation where transformation_nme='product_closing';
v_fh UTL_FILE.file_type;
BEGIN
v_fh := UTL_FILE.fopen('UTLFILELOAD', 'transformation_data.dat', 'w', 32000);--132767
FOR ci IN c1
LOOP
UTL_FILE.put_line( v_fh, ci.transformation_nme ||'~'|| ci.source_where_clause_text);
-- UTL_FILE.put_line( v_fh, ci.system_id ||'~'||ci.system_nme ||'~'|| ci.system_desc ||'~'|| ci.date_stamp);
END LOOP;
UTL_FILE.fclose( v_fh );
exception
when utl_file.invalid_path then dbms_output.put_line('Invalid Path');
END;
select length(
'(select to_char(b.system_id) || to_date(a.period_start_date,''dd-mon-yyyy'') view_key, b.system_id, to_date(a.period_start_date,''dd-mon-yyyy'') period_start_date, to_date(a.period_end_date,''dd-mon-yyyy'') period_end_date, to_date(a.clos
ing_date,''dd-mon-yyyy'') closing_date from ((select decode(certification_type_code, ''A'', ''IDESK_PRODUCTS_PIPELINE'',''C'', ''IDESK_PRODUCTS_COMMITMENT_LINKAGE'') system_nme, to_char(to_date(''01'' || lpad(trim(to_char(certification_as_of_month_yr)),6,''0''),''ddmmyy
yy''),''dd-mon-yyyy'') period_start_date, to_char(last_day(to_date(''12'' || lpad(trim(to_char(certification_as_of_month_yr)),6,''0''),''ddmmyyyy'')),''dd-mon-yyyy'') period_end_date, to_char(trunc(certification_datetime_stamp), ''dd-mon-yyyy'') closing_date from odsu
pload.prod_monthly_certification where certification_type_code in (''A'',''C'') minus select trim(system_nme), to_char(period_start_date, ''dd-mon-yyyy''), to_char(period_end_date, ''dd-mon-yyyy''), to_char(closing_date, ''dd-mon-yyyy'') from utility.system_closing
statusv where system_nme in (''IDESK_PRODUCTS_PIPELINE'', ''IDESK_PRODUCTS_COMMITMENT_LINKAGE'')) union all (select ''BMS Commitment Link'' system_nme, to_char(to_date(''01'' || lpad(trim(to_char(certification_as_of_month_yr)),6,''0''),''ddmmyyyy''),''dd-mon-yyyy'')
period_start_date, to_char(last_day(to_date(''12'' || lpad(trim(to_char(certification_as_of_month_yr)),6,''0''),''ddmmyyyy'')),''dd-mon-yyyy'') period_end_date, to_char(trunc(certification_datetime_stamp), ''dd-mon-yyyy'') closing_date from odsupload.prod_monthly_c
ertification where certification_type_code = ''C'' minus select trim(system_nme), to_char(period_start_date, ''dd-mon-yyyy''), to_char(period_end_date, ''dd-mon-yyyy''), to_char(closing_date, ''dd-mon-yyyy'') from utility.system_closing_status_v where system_nme
= ''BMS Commitment Link'') union all (select ''BMS'' system_nme, to_char(to_date(''01'' || lpad(trim(to_char(certification_as_of_month_yr)),6,''0''),''ddmmyyyy''),''dd-mon-yyyy'') period_start_date, to_char(last_day(to_date(''12'' || lpad(trim(to_char(certification_as_
of_month_yr)),6,''0''),''ddmmyyyy'')),''dd-mon-yyyy'') period_end_date, to_char(trunc(certification_datetime_stamp), ''dd-mon-yyyy'') closing_date from odsupload.prod_monthly_certification where certification_type_code = ''A'' minus select trim(system_nme), to_char
(period_start_date, ''dd-mon-yyyy''), to_char(period_end_date, ''dd-mon-yyyy''), to_char(closing_date, ''dd-mon-yyyy'') from utility.system_closing_status_v where system_nme = ''BMS'')) a, utility.system_v b where a.system_nme = b.system_nme)') length1
from dual
--2531
begin
SSUBRAMANIAN.transformation_utl_file;
end;
create table transformation_utl
TRANSFORMATION_NME VARCHAR2(40),
SOURCE_WHERE_CLAUSE_TEXT VARCHAR2(4000)
ORGANIZATION external
type oracle_loader
default directory UTLFILELOAD
ACCESS PARAMETERS
records delimited by newline CHARACTERSET US7ASCII
BADFILE UTLFILELOAD:'transformation.bad'
LOGFILE UTLFILELOAD:'transformation.log'
fields TERMINATED by "~"
LOCATION ('transformation_data.dat')
) REJECT LIMIT UNLIMITED
select * from transformation_utlafter running the procedure, did you verify that the file 'transformation_data.dat' has data? open it, make sure it's correct. maybe it has no data, and that's why the external table doesn't show anything.
also, check the LOG and BAD files after selecting from the external table. maybe they have ERRORS in them (or all the data is going to BAD because you defined something wrong). -
Photo use only, what software can be removed
Purchased iPad specifically for photo and video projects. To increase capacity, what software can I delete from iPad to free up more space and not jeopardize integrity of device.
None. Preinstalled Apps cannot be removed. However their footprint is almost negligible in relation to the general OS space needs.
There would be no real benefit in removal even if you could remove them.
If you feel space is an issue, perhaps a larger capacity iPad would be a better choice. -
How to delete large data using XML batch in chunk
public void DeleteListItems(SPWeb web, SPList list)
RMPExceptionManager.LogErrorInFile("--------Delete List Items from : " + list + " starts--------", true);
try
web.AllowUnsafeUpdates = true;
StringBuilder builder = new StringBuilder();
builder.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?><Batch>");
string s = "<Method>" +
"<SetList Scope=\"Request\">" + list.ID + "</SetList>" +
"<SetVar Name=\"ID\">{0}</SetVar>" +
"<SetVar Name=\"Cmd\">Delete</SetVar>" +
"</Method>";
foreach (SPListItem item in list.Items)
builder.Append(string.Format(s, item.ID.ToString()));
builder.Append("</Batch>");
web.ProcessBatchData(builder.ToString());
web.AllowUnsafeUpdates = false;
RMPExceptionManager.LogErrorInFile("--------Delete List Items from : " + list + " ends--------", true);
catch (Exception ex)
RMPExceptionManager.LogErrorInFile("--------delete List Items exception--------", bIsLogEnabled);
RMPExceptionManager.LogErrorInFile(ex.Message, bIsLogEnabled);
RMPExceptionManager.LogErrorInFile(ex.Source, bIsLogEnabled);
RMPExceptionManager.LogErrorInFile(ex.StackTrace, bIsLogEnabled);
RMPExceptionManager.LogErrorInFile("-------------------------------------------------------", bIsLogEnabled);
I am using the above code to delete the data from list.
currently its not deleting properly as its executing huge xml batch.
How can I change the above code in to chunk of 1000 so that I can delete 25000 records easily?I tried the below code but its not working properly.
first time when it comes in do loop its deleting the records one by one and not using batch of 1000.
after some time(aprox 30 min) it starts executeing batch of 1000 but not deleting whole records. out of 10,000 its deleting hardly 7000 then stops the delete process and jumps on next step.
I am not getting why its showing this behaivour ? Is it time out after some time in xml batch? but its still executing the other code after comming out of delete function.
web.AllowUnsafeUpdates = true;
StringBuilder builder = new StringBuilder();
builder.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?><Batch>");
string s = "<Method>" +
"<SetList Scope=\"Request\">" + list.ID + "</SetList>" +
"<SetVar Name=\"ID\">{0}</SetVar>" +
"<SetVar Name=\"Cmd\">Delete</SetVar>" +
"</Method>";
// Query to get the unprocessed items.
SPQuery query = new SPQuery();
query.RowLimit = 1000;
query.Query = "<Where></Where>";
do
SPListItemCollection remainingItems = list.GetItems(query);
foreach (SPListItem item in remainingItems)
builder.Append(string.Format(s, item.ID.ToString()));
builder.Append("</Batch>");
web.ProcessBatchData(builder.ToString());
query.ListItemCollectionPosition = remainingItems.ListItemCollectionPosition;
RMPExceptionManager.LogErrorInFile("--------Delete batch remaining : " + remainingItems.ListItemCollectionPosition + " --------", true);
} while (query.ListItemCollectionPosition != null);
any body got this type of issue?
is there any problem in above code?
is there any other way to do this deletion process in better way? -
Can express vi handle large data
Hello,
I'm facing problem in handling large data using express vi's. The input to express vi is a large data of 2M samples waveform & i am using 4 such express vi's each with 2M samples connected in parallel. To process these data the express vi's are taking too much of time compared to other general vi's or subvi's. Can anybody give the reason why its taking too much time in processing. As per my understanding since displaying large data in labview is not efficient & since the express vi's have an internal display in the form of configure dialog box. Hence i feel most of the processing time is taken to plot the data on the graph of configure dailog box. If this is correct then Is there any solution to overcome this.
waiting for reply
Thanks in advanceHi sayaf,
I don't understand your reasoning for not using the "Open Front Panel"
option to convert the Express VI to a standard VI. When converting the
Express VI to a VI, you can save it with a new name and still use the
Express VI in the same VI.
By the way, have you heard about the NI LabVIEW Express VI Development Toolkit? That is the choice if you want to be able to create your own Express VIs.
NB: Not all Express VIs can be edited with the toolkit - you should mainly use the toolkit to develop your own Express VIs.
Have fun!
- Philip Courtois, Thinkbot Solutions -
A relative synced my iphone with his laptop without me knowing. It had a passcode on the phone but the sync still worked. I have since found out he is quite IT knowledgeable and has been known to track other peoples phones that he wants to know information about. How is my data useful to him and can he restore this data on another iPhone and run it parallel to mine? I have had people send me messages which I have not received. These have been screen shot to me later including time and I have just not got them. I had 4 weeks worth of messages go missing from my phone..I know that he synced my phone because his work laptops I'd came up in my settings. Also if the above can be done can he change the settings on my actual phone and access my location without placing tracking software on my phone. Can someone please help here as I can't restore a backup to my phone for obvious reasons and refuse to change my number because of this loser.
Connect the device to the computer.
In iTunes, select the content desired to sync.
Sync.
This is all described in the User's Guide, reading it may be a good place to start. -
Can we change the system date using Sql
can we change the system date using Sql statement..
can anyone help
Tariq.There is an initialization parameter called FIXED_DATE which lets you set a fixed sysdate for testing purposes, and you can alter that date using the ALTER SYSTEM command, but as implied by the name you are setting a data/time that doesn't change. Since the normal sysdate is derived from the O/S it cannot be altered through SQL
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How to upload data using utl_file when you dont know the exact file name
Hi
i want to upload data from a flat file to a table.
i dont know the exact file name. i want to make a search for filename. like i want to make a search on file (say test*) which will give me all the files with test.
i want to upload data using these files.
how can i do this by using UTL_FILE.
Regards
ManishThank you very much.
Thing is previously we are using sqlloader and shell script for loading the data.
now i am creating a procedure (if possible without parameters).
Is there any other way i can do that.
can i make a wild card search using utl_file.
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Manish -
Can we look at EBAN table data using SE11?
Can we look at EBAN table data using SE11? who can I look at the data in EBAN or ECKPO in ECC?
Thanks in advance.
York.SE11 - Create/Change/Display Table Fields - ABAP Dictionary
SE16 - Display Table Entries - You cannot see Structure
For Data - SE16 - Input Table Name - F7 - F8
Or
SE11 - Input Table Name - F7 - {Ctrl + Shift + F10 }/Contents - F8 -
Using RSA to encrypt query string data
If I want to use RSA to encrypt query string data, what is the industry standards for such a thing? I understand how the RSA works. Based upon that alone, I would just need to get the public key. However, I understand that it is safer to use a PKI to obtain that public key?
Can someone tell me what is "best practice" for such a thing?If the third-party-site supports https:, you do NOT have to encrypt anything yourself. That's what https is for - the communication between the user-agent and the server is encrypted as part of the protocol, and all the complicated parts of insuring a secure channel are handled for you.
If the secure site does not support htpps, then you can't use it. Which begs the question of why you are trying to do secure communication via HTTP POST with an insecure site.
To clarify, so we're sure we're talking about the same scenario - there's your server (A), which generates pages for a user-agent (B), which pages point to a third-party site (C). Are you trying to protect your data from eavesdroppers? Or are you trying to hide it from B?
In the first case, you have two options.
1) If both A and C supports https, then all you need to do is build pages with https: URLs pointing at C, and you're done. B hits A using https: URLs, it gets pages back that point to C using https URLs, lots of crypto-magic happens under the covers without you haveing to worry about it, and your data is protected.
2) If A and/or C do NOT support https, then you have to figure out how to encrypt communications between A and C. This is a private channel - we won't be able to help you much, because we don't know what C is expecting. Whatever C's protocol is, and whatever its key is, is what you'll need to implement in A, in order to talk to C.
(If you're actually trying to hide data from B, while sticking it into a page that B has to render - ew. Just...ew. It's wrong on enough levels that I don't think I can adequately describe them all.)
You asked about best-practices - 1) is it. 2) is not. Don't do that. No offense, but specially given your level of understanding of How Crypto Works, whatever you come up with is really really REALLY likely to be horribly flawed in a way that you won't see.
Crypto is both easier and harder than you think it is. Your best bet is to use the standards that the community has hammered out - your data is much, much safer that way.
Grant -
I can�t decrypt a text encrypted (using RSA) with keys on smartcard.
I use a Cyberflex Access e-gate smartcard and I can encrypt and decrypt any text on the card but if I encrypt a text outside using the exported public key, card is not able to decrypt the message.
On the card side:
�
RSAPrivateCrtKey privateKey;
RSAPublicKey publicKey;
Cipher cipherRSA;
�
private MyIdentity (byte buffer[], short offset, byte length){
// initialise PIN
pin = new OwnerPIN(PinTryLimit, MaxPinSize);
pin.resetAndUnblock();
// Key Pair
KeyPair kp = new KeyPair(KeyPair.ALG_RSA_CRT, (short)1024);
kp.genKeyPair();
privateKey = (RSAPrivateCrtKey) kp.getPrivate();
publicKey = (RSAPublicKey) kp.getPublic();
cipherRSA = Cipher.getInstance(Cipher.ALG_RSA_PKCS1, false);
if (buffer[offset] == (byte)0) {
register();
} else {
register(buffer, (short)(offset+1) ,(byte)(buffer[offset]));
private void GetPublicKey (APDU apdu) {
if (pin.isValidated()){
byte apduBuffer[] = apdu.getBuffer();
// short byteRead = (short)(apdu.setIncomingAndReceive());
short bytesMod = publicKey.getModulus(apduBuffer, (short) 0);
short bytesExp = publicKey.getExponent(apduBuffer,bytesMod);
short outbytes = (short) (bytesMod + bytesExp);
// Send results
apdu.setOutgoing();
// indicate the number of bytes in the data field
apdu.setOutgoingLength((short)outbytes);
// at offset 0 send 128 byte of data in the buffer
apdu.sendBytesLong(apduBuffer, (short)APDUDATA, (short)outbytes);
} else {
ISOException.throwIt (ISO7816.SW_SECURITY_STATUS_NOT_SATISFIED);
private void Decrypt (APDU apdu) {
byte apduBuffer[] = apdu.getBuffer();
short byteRead = (short)(apdu.setIncomingAndReceive());
cipherRSA.init(privateKey, Cipher.MODE_DECRYPT);
cipherRSA.doFinal(apduBuffer,(short)APDUDATA, byteRead, apduBuffer, (short)APDUDATA);
// Send results
apdu.setOutgoing();
// indicate the number of bytes in the data field
apdu.setOutgoingLength(byteRead);
// at offset 0 send x byte of data in the buffer
apdu.sendBytesLong(apduBuffer, (short)APDUDATA, byteRead);
}Off the card, I have a java client:
public void getPublicKey () {
int CLA, INS, P1, P2;
int iArray[] = new int[0];
short sArray[] = new short[0];
String ss = new String("");
String s;
byte [] sBytes = null;
byte [] myModulus = new byte[128];
byte [] myExponent = new byte[3];
try {
CLA = 0x68;
INS = 0x78;
P1 = 0;
P2 = 0;
sArray = iopCard.SendCardAPDU(CLA,INS,P1,P2,iArray,0x83);
int iErrorCode = iopCard.GetLastErrorCode();
if (iErrorCode != 0x9000) {
if (iErrorCode == 0x6300) {
System.out.println("Wrong PIN");
} else {
s = iopCard.GetErrorMessage();
System.out.println("SendCardAPDU: " + s);
} else {
System.out.println("Getting Public Key...");
if (sArray != null) {
sBytes = new byte[sArray.length];
for (int i = 0; i < sArray.length; i++) {
sBytes[i] = (byte)sArray;
ss = new String(sBytes);
System.out.println ("------ BEGIN PUBLIC KEY -------------------");
for (int i=0; i < sArray.length; i++){
System.out.print(Integer.toHexString(ss.charAt(i)).toUpperCase());
System.out.println ();
System.out.println ("------ END PUBLIC KEY -------------------");
} else {
System.out.println("Nothing.");
} catch (slbException b) {
s = b.getMessage();
System.out.println("Validate error: " + s);
for (int i=0; i<128; i++){
myModulus[i] = (byte) sArray[i];
for (int i=0; i<3; i++){
myExponent[i] = (byte) sArray[128+i];
BigInteger modulus = new BigInteger (1,myModulus);
BigInteger exponent = new BigInteger ("65537"); // there is a well-known bug in getExponent
RSAPublicKeySpec keySpec = new RSAPublicKeySpec(modulus, exponent);
KeyFactory keyFactory =null;
try {
keyFactory = KeyFactory.getInstance("RSA");
publicKey = keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println(e.getMessage ());
} catch (InvalidKeySpecException e) {
System.out.println(e.getMessage ());
System.out.println("------------------ BEGIN ------------------");
ss = new String(publicKey.getEncoded());
for (int i=0; i < publicKey.getEncoded().length; i++){
System.out.print(Integer.toHexString(ss.charAt(i)).toUpperCase());
System.out.println ();
System.out.println("------------------ END ------------------");
// to a file
try {
//Store in raw format
FileWriter fw = new FileWriter("public_raw.txt");
for (int i=0; i < publicKey.getEncoded().length; i++){
fw.write(Integer.toHexString(ss.charAt(i)).toUpperCase());
fw.close();
//could also store it as a Public key
System.out.println("Public key saved to file");
} catch(Exception e) {
System.out.println("Error opening and writing Public key to file : "+e.getMessage());
public void encrypt () {
byte cadena[] = {0x01,0x02,0x03,0x04};
byte resultado[] = new byte[256];
// Create Cipher
try {
cipherRSA.init(Cipher.ENCRYPT_MODE, publicKey);
resultado = cipherRSA.doFinal (cadena);
} catch (InvalidKeyException e) {
System.out.println(e.getMessage());
} catch (BadPaddingException e) {
System.out.println(e.getMessage());
} catch (IllegalBlockSizeException e) {
System.out.println(e.getMessage());
String ss = new String (resultado);
System.out.println("------------------ BEGIN 4 ------------------");
for (int i=0; i < resultado.length; i++){
System.out.print(Integer.toHexString(ss.charAt(i)).toUpperCase());
System.out.println ();
System.out.println("------------------ END 4 ------------------");
Another question is that I don�t understand why I get a constant length string when I encrypt a text on the card and variable length string when I encrypt off the cardI thought that exponent was 3 bytes long...
On the card I have the following code:
private void GetExponent (APDU apdu) {
if (pin.isValidated()){
byte apduBuffer[] = apdu.getBuffer();
short bytesExp = publicKey.getExponent(apduBuffer, (short) 0);
// Send results
apdu.setOutgoing();
// indicate the number of bytes in the data field
apdu.setOutgoingLength((short)bytesExp);
// at offset 0 send 128 byte of data in the buffer
apdu.sendBytesLong(apduBuffer, (short)APDUDATA, (short)bytesExp);
} else {
ISOException.throwIt (ISO7816.SW_SECURITY_STATUS_NOT_SATISFIED);
}And if I don't send an APDU with length expected, I get the exception 6C03 (Correct Expected Length (Le) = 0x6C00) so I send APDU with 03 length and I receive the exponent. The problem is that there is a well know bug in getExponent and it returns 00 00 00... so I set it up to 65537 outside the card. -
Is it enough only use RSA encryption?
Hi all,
I want to know is it enough if we develop Java Card application by using only RSA encryption?..
if on-card application uses RSA, and so off-card application uses RSA, is it mean that we have to use 2 KeyPairs?..
I mean, the off-card shall generate Pub and Priv Key, Keep Priv-Key secret, and the Pub key is distributed to card..
and of course on-card do same thing, it will generate Pub and Priv Key, Keep Priv-Key secret, and the Pub key is distributed to Off-card application..
Please correct me if this wrong..
if this isn't wrong, do i still have to use X509Certificate?..
Thanks in advance,,Thanks Lexdabear and Shane for your reply..
Actually, i'm a little bit confused how do i can make sure the data is being sent is confidential and valid (it means that the data received by receiver is same with the data sent by sender)..
Hm, i read from the PDF document that i downloaded from the internet, says that :
● Signing
Use private key to sign data
● Verification
Use public key to verify signature
● Encryption
Use public key to encrypt data
● Decryption
Use private key to decrypt data
Can i mix these features together if i only use single RSA Key-Pair (only on the card side)?, assume that the on-card application hold only Private-Key, can on-card do these features together ((encrypt, decrypt, sign, verify) if it has only Private Key? ..
based on that, it means that if we use only single RSA KeyPair, assume that the Card holds the Private Key and the Off-card holds the Public-Key, so the application in the card can only do Sign and Encrypt data before data sent to the off-card, and of course, the off-card can only do Verify signature and Decrypt data received..
So, how the card can decrypt and verify the signature of the data sent by off-card if the card doesn't hold the public key of the off-card ?
i thought the off-card SHOULD send its Public-Key to the on-card application, so the On-Card application can do Decrypt and Verify the signature of data sent by Off-Card..
i thought single RSA keypair isn't enough (My point of view as a less of experience programmer)
Please correct me if i'm wrong..
Thanks in advance..
Edited by: Leonardo_Carreira on Jun 22, 2010 2:22 AM -
Running out of memory while using cursored stream with large data
We are following the suggestions/recommendations for the cursored stream:
CursoredStream cursor = null;
try
Session session = getTransaction();
int batchSize = 50;
ReadAllQuery raq = getQuery();
raq.useCursoredStream(batchSize, batchSize);
int num = 0;
ArrayList<Request> limitRequests = null;
int totalLimitRequest = 0;
cursor = (CursoredStream) session.executeQuery(raq);
while( !cursor.atEnd() )
Request request = (Request) cursor.read() ;
if( num == 0 )
limitRequests = new ArrayList<Request>(batchSize);
limitRequests.add(request);
totalLimitRequest++;
num++;
if( num >= batchSize )
log.warn("Migrating batch of " + batchSize + " Requests.");
updateLimitRequestFillPriceForBatch(limitRequests);
num = 0;
cursor.releasePrevious();
if( num > 0 )
updateLimitRequestFillPriceForBatch(limitRequests);
cursor.close();
We are committing every 50 records in the unit of work, if we set DontMaintianCache on the ReadAllQuery we are getting PrimaryKeyExceptions intermittently, and we do not see much difference in the IdentityMap size.
Any suggestions/ideas for dealing with large data sets? ThanksHi,
If I use read-only classes with CursoredStream and execute the query within UOW, should I be saving any memory?
I had to use UOW because when I use Session to execute the query I get
6115: ISOLATED_QUERY_EXECUTED_ON_SERVER_SESSION
Cause: An isolated query was executed on a server session: queries on isolated classes, or queries set to use exclusive connections, must not be executed on a ServerSession or in CMP outside of a transaction.
I assume marking the descriptor as read-only will avoid registering in UOW, but I want to make sure that this is the case while using CursoredStream.
We are running in OC4J(OAS10.1.3.4) with BeanManagedTransaction.
Please suggest.
Thanks
-Raam
Edited by: Raam on Apr 2, 2009 1:45 PM -
Need to load large data set from Oracle table onto desktop using ODBC
I don't have TOAD nor any other tool for querying the database. I'm wondering how I can load a large data set from an Oracle table onto my desktop using Excel or Access or some other tool using ODBC or not using ODBC if that's possible. I need results to be in a .csv file or something similar. Speed is what is important here. I'm looking to load more than 1 million but less than 10 million records at once. Thanks.
hillelhalevi wrote:
I don't have TOAD nor any other tool for querying the database. I'm wondering how I can load a large data set from an Oracle table onto my desktop using Excel or Access or some other tool using ODBC or not using ODBC if that's possible. I need results to be in a .csv file or something similar. Speed is what is important here. I'm looking to load more than 1 million but less than 10 million records at once. Thanks.
Use Oracle's free Sql Developer
http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html
You can just issue a query like this
SELECT /*csv*/ * FROM SCOTT.EMP
Then just save the results to a file
See this article by Jeff Smith for other options
http://www.thatjeffsmith.com/archive/2012/05/formatting-query-results-to-csv-in-oracle-sql-developer/
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