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Chat With Your Writer. Communicate directly with your writer anytime regarding assignment details, edit requests, etc. Affordable Prices. Assignment Essays Features. why do you need to rebuild here at all?? but why don't you show us what you are doing -- at the very least -- define what "fails at the end" means error codes, messages, details. George Lee, November 12, - pm UTC. Dear Tom, Yes, I should provide enough information to you.

Sorry for that. November 13, - am UTC. stmt ; 8 execute immediate x. A reader, December 11, - pm UTC. Hi Tom, I am running below update statement from past 24 hr and it's still running.. It's doing full table scan of both table sinace I am using function in where clause.. We using RULE base optimizer and oracle 8. December 11, - pm UTC. A reader, December 12, - pm UTC. Please help Thanks. December 13, - am UTC. you put the hint in the wrong place : and you might not have met all of the requirements for FBI's.

your hint is wrong must use the correlation name of P and in the wrong place should be in the subquery. Can you tell me why the physical reads increase so much using parallel hint in the DML sql,thanks. well, for a tiny number of records like this, i would not even consider PQ at this point. But -- to answer your questions the cost, well the cost is affected by thousands of things. HINTS definitely affect the cost That is in part how hints work -- by playing with costs.

Ignore the cost of two queries that are not the same, they are NOT comparable. the PIO's -- well, you ran one before the other?

That and parallel query prefers to checkpoint -- and do direct io many times you might find PQ doing a global checkpoint before the query begins to get current images onto disk in order to just all hit slam the data as fast as it can without messing with the buffer cache but for so few records -- it would seem that regular sql is what you want.

A reader, December 13, - pm UTC. Hi Tom, Followed you advice WORKS LIKE A CHARM.. updated 1. Online updation of very big table Praveen, March 06, - pm UTC. Hi Tom Iwant to update a table with one go on online system.

A table has 20 lakh records and has columns. when i give the update command it takes ~ one hrs. I don't know why it is taking so much time even index is created on that particular field. By defualt is unapproved. Suggest the best solution pkr. March 06, - pm UTC. It would be the INDEX that slowed it down. You want to FULL SCAN this table. You want there to be NO index on the column you are updating. it gives error praveen, March 07, - am UTC. on dropping the index it gives error ora thanks.

March 07, - am UTC. that'll happen whilst there are outstanding transactions, yes. You'll want to keep trying until you get a chance to drop it. thanks jasdeep,praveen, March 07, - am UTC. i have solved that problem as an user has locked rows on the but at present not logged on i killed that session and index was dropped immediately.

and updates were as fast as u can think. Update taking hrs of time Sachin, March 09, - am UTC. Hi Tom, I have a query as: I have two tables Table1 with around records max and table2 actually the GL code combination master table with around , records. I need to update three fields in table1 which is a temp processing table with a unique value from table2.

T1 has ccid fields which need to be updated, and s1-s4 fields corresponding to segment1-segment4 fields of table2 Following is the query like: UPDATE table1 t1 SET t1. s4 and t2. s2 and t2. s1 and t2. When I check the table locks the table remains locked Row Xclusively.

I am committing immediately after the update statement in the procedure. Cud u pls tell me why is this happening? March 09, - pm UTC. not that i don't believe you but -- about the locking issue -- I'm not sure i believe you.

when you commit -- locks are released. segment3 in 'xxxxx','zzzzzz', 'wwwww' and t2. Updating millions of rows A reader, March 15, - pm UTC. If so, my understanding is : 1. March 15, - pm UTC. I "might", "probably" if it was most of the records Tom, In the above discussion you mention : 1. The deletes will put them on because the used space in the block will drop below PCTUSED.

Is it correct? The update will put them on if the updated column makes the used space in the block fall below PCTUSED or the updated column makes the free space available in the block less than PCTFREE.

Is it correct. If both of the above understanding is not correct, please explain. Also, please let me know how we could track the movement of the blocks on and off the freelist.

to track individual blocks -- not without dumping blocks and I don't go there. A small correction A reader, March 15, - pm UTC. Tom, In the above scenario for question 2, there is a small correction marked in CAPITAL letters : "The update will put them on if the updated column makes the used space in the block fall below PCTUSED AND WILL TAKE OFF of the freelist if the updated column makes the free space available in the block less than PCTFREE.

if the update increases the row size, it can take it off the freelist. Parallel DML A reader, March 16, - am UTC. I'm using 9. Has this behavior changed in the later versions? How could I speed it up? March 16, - am UTC. enable PK with parallel clause A reader, March 20, - pm UTC. Hi I am working in 8. I want to delete 30 million rows of 60 million so I am doing this 1. create a copy of original table with good data 2. disable original tables´s constraints, primary keys and child FKs and foreign keys 3.

truncate the original table 4. make all original tables indexes unusable 5. insert append back from copy to original, I have to do this way because I am not allowed to modify constraint names 6. drop the copy 7. enable constraints. here when I enable PK I cannot provide paralle clause right? I searched the doco but it seems that I can only specify using index tablespace clause or I am missing something? rebuild all unusable indexes.

March 21, - am UTC. How to Update millions or records in a table A reader, March 25, - am UTC. Hi Tom, I read your response to Murali's question above and believe, there will be a downtime window for the application.

This is because if I want to keep the index names same as before, I will have to create the new table, drop the old table, rename the new table to old table name and then create the required indexes on the same. Wondering, how if we can create the indexes by some other name on the new table and rename the indexes after dropping the old table.

As always your valuable advice helps a lot! March 25, - pm UTC. you can rename the indexes. alter index supports this. how to make this restartble? A reader, March 25, - pm UTC. The process is divided in 10 steps 1. Create TEMP table, CTAS from original table 2. Disable constraints 3. Truncate original table 4. Set indexes to UNUSABLE 5.

Insert into original table from TEMP table 6. Drop TEMP table 7. Create PK and UK 8. Enable PK and UK 9. Enable FKs Rebuild indexes I want to make this process restartble, i. e if it fails in step 3 if I later rerun the procedure it will start from step 3 again. How can we achiveve this?

Any suggestions :-? What I see is that I will hav quite a few redundant codes you'd have to keep a state table and have you code query it up, much like you are suggesting. That would do it yes. another "inserting" idea might be to a insert the steps to process b delete them as you complete them and commit c to restart, just pick up at the step you wanted you could insert the procedures to be called and just: for x in select name from procedures order by seq loop execute immediate 'begin ' x.

name '; end;'; delete from procedures commit; end loop just a thought, not fully baked. provide more information about that procedure drop indexes and rebuild with nologging mohan, April 07, - am UTC. Hi Tom Could you provide more information about that procedure and how to drop indexes and rebuild with nologging. We are using informatica etl tool before loading bulk data into target drop the indexes pre-session and after load the data rebuilt the indexes with nologging post-session , it takes less amount of time because its generates less undo Regards Mohan.

April 07, - am UTC. it is just a drop and create? not sure what you are looking for -- if it is "syntax", we document that. Problem with Update Ram, April 08, - am UTC. Hi Tom, This update is not working properly. How to correct this? April 08, - am UTC. you need two quotes for a quote in a string until 10g when there is another way. Updating million records Himnish Narang, April 08, - am UTC. Hi Tom, i was just going through the discussion in this subject. In this you have described that you will create a table instead of going for updates of million records and this update will be peroformed as part of creation of new table.

Don't you think that the new table will also occupy the same amount of space and after dropping the table we will have to do the reorg for that tablespace. please comment. reorgs are so overrated.

no, i would not reorge a tablespace or anything simply cause I copied some data and dropped some old stuff. not a chance. How to Update millions or records in a table Ganesh, April 08, - am UTC. Hi Tom, Its very useful and I used this saved lots of time by creating new table. I got another issue similar to this. We are using 9i. there is requirement of needs to modify primary key datatype number to varchar which is having lot of dependents. Is there any option with out rebuilding table as data already exist.

Can you please suggest on this. Thanks in Advance. Please see this Ram, April 08, - pm UTC. Hi Tom, Thanks for your reply but Still it's not working properly.

You say about another way in Oracle 10G. How does that work? Could you please provide an example. Please do reply. April 09, - am UTC. you are returning SAL one thing into two things :x,:y different problem all together.

in 10g, the strings could be q' how's this for quoting ' instead of 'how''s this for quoting' a character string literal that starts with q for quote will use the next two characters as the start quote and those two characters in reverse for the end quote. Thanks Ram, April 09, - am UTC. Hi Tom, Thanks for your reply.

I found out the way of doing it as follows and Do you have any other option to do it in a better way? get rid of the dynamic sql, it isn't necessary fixes your original issue with the quotes as well. To Mr. Ram A reader, April 09, - am UTC. Hi Ram and All, May I request you all not to pester Tom with inane posts requesting Tom to debug and program on our behalf.

This forum is not to learn coding. update based on rowid john, April 16, - am UTC. Tom, we use non-intelligent primary key to update the table through a stored procedure. April 16, - am UTC. interesting choice of terminology. But in any case -- once upon a time ago, rowids were IMMUTABLE. Once assigned a row would have a rowid assigned to it and that rowid would live with that row until you deleted it. Starting in 8i with support for updates to partition keys that would cause a row to move from partition A to partition B -- that is no longer true and then there are IOT's In 10g, there are even more options for 'row movement' -- an online segment shrink for example.

So, rowids can change and are changing in more circumstances as time goes on. Sooooo, if you have lost update detection in place using 'FOR UPDATE' -- rowids are very safe forms uses them. What I mean is -- you a select a. If that returns 0 rows, someone changed the data or reorg'ed it and moved it. You need to requery to get the current values before you let the user even think about modifying it. If that returns a row -- you got it. If that returns ora, something has it locked, you have to decide what you want to do about that.

c you can then safely update that row by rowid If you do not have lost update detection in place using FOR UPDATE locks -- then you should stick with a primary key probably, just to protect yourself in the future. update based on rowid john, April 19, - am UTC. thanks a lot Tom. to understand fully what you said, can you please tell 1. why do we have to where condition?

another question is, is there a situation where a rowid of a row being assigned another row of the same table? because this may cause more danger as we end up updating another row? thanks again. April 19, - am UTC. But - if we inserted the same exact values and they got the same exact rowid -- then 1 would make this "safe". the values of the row are the same, for all intents and purposes it IS the same row. If the newly inserted row doesn't match column by column the values we expect, well, then we'll reject it won't lock it and all will be well.

update large table Prasad Chittori, April 22, - pm UTC. I have a very large partitioned table with DATE column, I would like to take out the time portion from the date column I did the following and it is taking lot of time and failing with unable to extend the rollback segments.

April 23, - am UTC. parallel dml -- each pq slave can get its own RBS, letting you use them all at the same time, not just one of them. convert delete to insert marvin, April 26, - am UTC.

Hi We want to delete several tables of several million of rows. The problem is, the delete statement is quite simple but if we want to this faster we would insert to temp table, truncate original and insert back the good data. Is there a better approach?

April 26, - pm UTC. why not: create table new as select rows to keep; drop table old; rename new to old; do the first in parallel, with nologging. err the problem is convert the DELETE to CTAS A reader, April 26, - pm UTC. Hi create table new as select rows to keep; drop table old; rename new to old; do the first in parallel, with nologging. That is exactly I want to do, the problem is until now we have always done the other way round, use plain DELETE and it takes a week to delete everything!

If I want to do the reverse of DELETE statements some table has 5 DELETE statements! it is not as simple as write the DELETE the other way round? For example how would you change delete tab1 where exists select null from tab2, tab3 where tab2. id and tab1. fid delete tab1 where exists select null from tab2 where tab2.

id and tab2. id is null Is simple as this? April 27, - am UTC. if i had this: delete tab1 where exists select null from tab2, tab3 where tab2. fid is not null and tab3. id is not null and NOT tab2. fid is not null and tab2. Negate the conditions for the where exists. that is, after outer joining tab1 to tab2, tab3 -- remove the rows where tab2. id is not null -- that is subquery one in your deletes above.

where tab2. id is null -- that is subquery two in your deletes above. err the problem is convert the DELETE to CTAS marvin, April 26, - pm UTC. thank you very much for the outer join tip marvin, April 27, - am UTC. Hi I am going to have a look how to apply the outer join in order to convert DELETE to CTAS.

swobjectid AND t. These DELETE for example cant be converted into one as follows right? swtype IS NULL OR t. April 28, - pm UTC. why have any commits in between.

but of course -- any four deletes against a single table can and if you ask me, should be done as a single delete.

the outer join was used in the CTAS, not in a delete. why do you use outer join A reader, April 27, - am UTC. hi Why is outer join needed for tab1, tab2 and tab3 :-? outer join is mandatory for that in this example. to marvin A reader, April 27, - am UTC. id is null. regarding the conditions A reader, April 27, - am UTC. Hi Tom May you show some light why NOT tab2. id is not null is same as exists select null from tab2, tab3 where tab2. fid and NOT tab2. id is null is same as exists select null from tab2 where tab2.

id is null Cant see why. Thank you. it isn't the same. it is in fact the opposite. if you outer join T1 to T2 to T3 and before you were looking for where exists a a match in T2 tab1. fid b a match in T3 for that T2 tabe2. id then you are saying "if I outer join T1 to T2 to T3, that row would be such that: a tab2.

fid is NOT NULL we found a mate b tab3. id is NOT NULL we found a mate in t3 for t2 with the where exists -- we would have deleted that row, hence with the CTAS which is finding rows to keep we simply NEGATE that with NOT. Therefore we would keep that row, IF that was "not" satisfied.

Same logic for the second part. the second where exists says delete the row if a there is a match in T2 where tab2. id b the id column in t2 for that match is NULL that would be in an outer join tab2. fid is not null -- we joined to a row tab2. id is null -- and that row is having id is null negate it and keep it. Updating Table having millions of records taking lot of Time.. Anand Pandey, April 28, - am UTC. Hi Tom, I hd a table having millions of record in which two of its cols are Null. i just tried to update the null colls with the data from other table, which is taking taking around hrs for a single day record, and I've to update it for 31 days.

pls help Me in getting the high perf. on updation. C1 AND SUBSTR A. Nologging - how does it impact recovery? Naresh, April 30, - am UTC. Hi Tom, This is a great chain of discussion. I especially liked the "outer join to replace the not exists". I am really looking forward to my copy of your first book that I oredered recently on it's way from amazon.

One question regarding making the table nologging: Does it not have implications for recovery? What am I missing? April 30, - pm UTC. you need to schedule a hot backup if you use non-logged operations, yes.

db sequential waits on UPDATE A reader, May 14, - am UTC. I use: LOOP 1. Bulk select rows at a time from Table A, C with rowids from C 2. Bulk insert 3. Bulk update table C END LOOP I am getting a very high number of "db file sequential read" waits on the update part. FROM vp v,citi c WHERE v. idno call count cpu elapsed disk query current rows Parse 1 0. Wait Total Waited Waited db file sequential read 4 0.

Wait Total Waited Waited db file sequential read 0. WHERE c. Wait Total Waited Waited db file sequential read 1. Please tell me a way to make this faster. May 15, - am UTC. thankfully that hint is malformed and hence ignored as well -- you are updating by rowid. append is not either really, especially with the values clause. you can review the trace file itself p1,p2,p3 will tell you file and block info, along with blocks read. you can use that to verify that it is the very act of reading the indexes that need to be updated and maintained that is causing this.

If they are not in the case, well, we'll need to read them into there. More Info A reader, May 16, - pm UTC. Thanks Tom, The hint in the update was there by a Developer, it has been rightly disabled. The insert is not a bottleneck so didn't look into it. This is a development machine, there are no other jobs running, asynchronous IO is enabled, the machine is on RAID 0 no fault tolerance - being a development one.

There are NO INDEXES on Tables being inserted and updated. The segment on which the WAITS db sequential read are happening are that of the TABLE that is being UPDATED. Please guide me next. May 17, - am UTC. then you are seeing physical IO performed to read into the buffer cache the data needed to be updated. If it is not cached, we'll have to read it. PARALLEL DML Sar, May 28, - pm UTC. Tom, I need to update a table that has 50 million rows but the number of rows affected are only 1 million rows.

I have a single update statement to do this. Can you please suggest me if there is anything better that I can do on this SQL to run it faster. Thanks Sar. May 28, - pm UTC. nope, that is perfect. shouldn't take very long at all. unless you are getting blocked constantly by other sessions. do i need to commit after execute immediate? for dml or ddl? A reader, June 02, - am UTC. or it dose automatically? I tried to find the answer but not found in doc. from above site please help. June 02, - am UTC.

You need to commit DML as DML does not do that. ok, so i did 1. child record exists if i did not issue the commit,post or rollback, and did not perform any DDL,constraints are DEFERRED what is the issue? can u help? A reader, June 02, - pm UTC. constraints all deferred 2. it NOT a ddl 3. I am not commiting or ending the tx manually. June 02, - pm UTC.

the constraint must not be deferrable. you have to have deferrable constraints in order to defer them. the default is "not deferrable".

Any suggestions on how to accomplish this on 7. What's the most efficient way? June 15, - pm UTC. I'd just create table as select concept of nologging did in fact exist, unrecoverable ; export it import it or use the sqlplus copy command if they are connected via a nice network.

A reader, June 16, - pm UTC. Had some long columns in there. So 'Create table as select' wouldn't work. Am just ending up plsql looping and hitting smaller chunks of the mega table. Then creating smaller target tables.. Am afraid I won't have sufficient temp space to do a sqlplus "Copy from". Also, documentation talks about Copy not being intended for Oracle to Oracle DBs. No idea why. June 16, - pm UTC. Per 7. You should use SQL commands CREATE TABLE AS and INSERT to copy data between Oracle databases.

June 17, - am UTC. but if you think about it doesn't matter what the doc says, it takes two connections. connections are only to oracle databases. sure you could be using a gateway -- but even there, it would be true that create table as and insert would work. Updating and Inserting 1 Million rows Daily with Bitmap indexes Sidda, June 24, - pm UTC. Hi Tom, Here we are facing very big problem. We have a Partitioned table with Million records with 70 columns and 10 bitmaps,10 B-tree indexes.

Daily we have to update and insert 1Million records. We tried with bulk updates but invain. What is the best method to follow up? Thanks in advance Sidda. June 24, - pm UTC. describe "in vain", what went wrong? it would be best to do a SINGLE insert into and a SINGLE Update against this table not even in bulk - just single statements.

Creating Table with aggregated data from another table RB, July 26, - pm UTC. Tom: Qn related to creating a table with data from another table - I want to create a table with few fields and aggregated some of few columns from another table.

I have index on ID, src and LOC fields. Any faster way of getting this table created? Great aproach, but is it as fast for an IOT table? Peter Tran, July 26, - pm UTC. Hi Tom, I'm trying the same approach with an IOT table. We have an IOT table partitioned daily. I want to recreate this table with a monthly partition. I do a CTAS parallel nologging using the new monthly partition, but it's SLOW. Then again, the table does have million rows.

Is the "Index Organization" part of table the slow part? Thanks, -Peter. did you give it a nice juicy sort area size? Unfortunately no. nice juicy sort area size" That would be a negative. Anyway, I can estimate how long this will take? Create Table with data from an aggregated sum of few fields from another table RB, July 26, - pm UTC. Followup: so how many records have that id? RB: Tom - This number varies - we have so many IDs in the master table.

If I pass one id then the query will have one equi join with that ID if more than one I was planning to use IN clause. So I do not know how many records per id I will have it in the table at any given point of time. now I'm confused -- the predicate is variant? you don't have to duplicate lots of text, it is all right here. Great suggestion! Hi Tom, Thanks for the useful suggestion. When you say parallel sessions, do you mean kick off a bunch of them using execute immediate?

Tom - If the user can select one or more ids. If I have more than one ID then I was planning to use an IN clause in the where clause. The temp table that I am creating will be used in a later phase of the app for other joins. What I am looking for a soln which will be must fater than my current approach.

The Query that I have given with a M table is taking more than 1 hr to create the aggregated table. what is the query plan in general then. you would not create a temporary table in oracle -- that would be so sqlserver.

just use that query in the "IN" statment in the first place!!!!! Peter Tran, July 27, - pm UTC. Hi Tom, I wanted to give you an update on progress.

The nice thing about your approach is I can monitor the progress, but it's not as fast I as thought it would be. I then executed a month's worth of insert each session.

Each partition holds around K to K rows. Should I expect to run this long? July 27, - pm UTC. sounds long -- can you run one of the sessions with a level 12 trace and see what they might be waiting on? I thought that this is useful for sort operation and building of indexes. Thanks, Dushan. big sort going on. A reader, July 28, - pm UTC. Would you suggest to re-create the table when other users want to update it online. How to change a DATATYPE of column. peru, July 30, - am UTC.

Hi Tom, How to change a datatype of a particular column. say a table with column VARCHAR2 for date. Now i want to change the datatype DATE. Assume that table has many records and referenced with tables , procedures,triggers.

July 30, - pm UTC. not really going to happen. Update to July 27, Peter Tran, August 22, - am UTC. Hi Tom, Sorry it took awhile to get back with you on this. You wanted to see a level 12 trace. I wanted to do some research first and I had to rebuild the table to reproduce the step. Here's the trace. Wait Total Waited Waited control file sequential read 8 0.

Can this be the reason for the large enqueue timed event? Are the 6 sessions waiting to lock the index to modify it? August 22, - pm UTC.

Umm, you were blocked by someone else for an excessively long period of time here. Enqueue waits: enqueue 3. doh, it was me doing it to you. only one session at a time can append. only one session at a time can direct path insert into a table. sorry -- use normal insert, I goofed. delete 2M records without dropping table. Sean, August 23, - pm UTC. Hi Tom, I have to delete 2M records from 6M records and the table has about columns Oracle , Solaris 9.

I understand that your suggestion of creating temp table with the records I needed, then drop the original table and change the temp table name. But since our table is not that big and the application is using this table all the time, we try to use traditional delete method to accomplish this. I tried each commit for records or records.

Both are quite slow. Pkey and a. August 24, - am UTC. removing 2 million rows, with columns every row in this table is CHAINED, when you have more than columns and probably many indexes -- it is not going to be what you might term "speedy".

PQ is for BIG BIG BIG things. but don't expect this to be super fast if this table is indexed. This table has a PK index so traditional delete takes a long time. I see the following options 1. Mark the index unusable, delete and rebuild index nologging.

This is significantly faster than plain delete 2. How would you compare 1 and 3 above? October 14, - am UTC. ETL is 'special', it doesn't matter 5 times a minute. I'd go with 2 actually, CTAS a newone, drop oldone, rename newone to oldone. A reader, October 14, - am UTC. What kind of failure? Instance or media failure? Oracle guarantees recoverability of commited transactions, right, why do you bring that up here?

The only reason I dont want to do 2 is that I usually want to prevent DDL in my code. The only difference between 2 and 3 is that the table is already created in 3 , right? i saw "use a gtt" i could only assume you mean: insert rows to keep into gtt truncate table insert rows from gtt into the table that would be dangerous. gtt would be dangerous here. truncate is ddl btw How can you Display multiple rows in one record Mack, October 14, - pm UTC. Hi Tom, Let's suppose in deptno 10, there are 3 to 5 employees, I want to see the emp names like TOM, KIM, JOHN and so on.

Is there an easy way to do it in SQL? The number of records are unknown, it could have 10, 20 or one hundred. Please advise. October 14, - pm UTC. collect in 10g stragg search for it -- nasty plsql you install once and use over and over and over and over and over in pre 10g. Query first and then update A reader, October 15, - am UTC.

We have two tables with approximately 28 million and 35 million records respectively. These tables are joined to produce data to be displayed to users using IE browsers. Based on this information, around records get added to these tables and around the same updated daily. Our SLA is to display each screenful rows in seconds. While partitioning is being reviewed to improve the performance for the queries, could you let us know if there are any issues regarding partitions?

For instance someone has reported that using global indexes on a partitioned table has degraded the performance. October 15, - am UTC. i seriously doubt partitioning is going to be used to increase the performance of these queries. partitioning -- great for speeding up a full scan. are you suggesting to full scan and still return in seconds? degraded performance" I just about fell out of my chair on that one. If you have my book "Effective Oracle by Design" -- I go into the "physics behind partitioning".

In order to return the first rows to a web based application -- you are doing to be using indexes or you are not going to be doing what you signed up to do -- funny, you have an SLA in place but no idea if you can live up to it whether the tables are partitioned or not probably won't have any bearing on making this faster.

given two tables index access get rows I personally would be shooting for well under 1 second response times for everything -- regardless of whether there was 1 row or 1 billion.

don't get the tie into "query first and then update" though. A reader, October 18, - am UTC. Each screenful with records in each screen should appear in seconds. October 18, - am UTC. so, you've signed up for an SLA you have no idea if you can meet. but hey -- using indexes to retrieve rows from 1, , should be about the same amount of time and way under subsecond. but -- getting to "screen " is not. Look to google as the gold standard for searching and web pagination o totally estimate the number of returned rows -- don't even THINK about giving an accurate count o don't give them the ability to go to page "", pages is more than sufficient o even if there is a page -- realize it doesn't make sense to go there no human could know "what I need is on page -- 6, rows into this result set.

Google stops you at page 99 o understand that page 2 takes more time to retrieve than page 1, page 50 more than 2, and so on as you page through google --each page takes longer But perhaps most importantly -- laugh at people that say things like: "For instance someone has reported that using global indexes on a partitioned table has degraded the performance. You can use it with regards to any feature!

if you have effective Oracle by design -- i go into the "physics" of partitioning and who -- without the judicious use of global indexes, your system could fall apart and run really really slow as well.

This question is You Asked Good Morning Tom. I need your expertise in this regard. I got a table which contains millions or records. I want to update and commit every time for so many records say 10, records. I dont want to do in one stroke as I may end up in Rollback segment issue s. Any suggestions please! Murali and Tom said If I had to update millions of records I would probably opt to NOT update. Rating ratings Is this answer out of date? If it is, please let us know via a Comment Comments Comment updating millions of records Om, November 11, - am UTC.

Questions How to Update millions or records in a table. Question and Answer. You Asked Good Morning Tom. updating millions of records Om, November 11, - am UTC. November 11, - pm UTC. Million records update Ramesh G, November 11, - pm UTC. What if a table has over million records and if i only want to update 1 million? If your method is still applicable could you elaborate it.

Many thanks in advance. most likely -- yes. I don't have a million row table to test with for you but -- the amount of work required to update 1,, indexed rows is pretty large. Fortunately, you are probably using partitioning so you can do this easily in parallel -- bit by bit.

This is absolutely a viable approach, and one we have used repeatedly. One of our apps updates a table of several hundred million records.

The cursor.. For loop approach for the update was calculated to take We institued the Insert into a dummy table append with nologging, and were able to complete the "update" in under 30 minutes. With nologging, if the system aborts, you simply re-run the 'update' again, as you have the original data in the main table. When done, we swap the partition of original data with the 'dummy' table the one containing new values , rebuild indexes in parallel, and wha-la! Our update is complete.

Alter tablexyz nologging. field3 from xyz x where blah blah blah. Obviously you need to rebuild indecies, etc as required. Hope this helps! updating millions of records A. Ashiq, November 11, - pm UTC. Hi Tom, As u suggested us to create a new table ,then drop the original table and rename the new table to original table instead of updating a table with millions of records.

But what happen to dependent objects ,everything will get invalidated. Yeah ,of course it'll recompile itself when it called next time. But again it dependent objects has to do parsing. Is it Ok. November 12, - am UTC. in case of delete A reader, November 12, - am UTC. We've a similar situation. There is no logical column to do partition. Please let me know what is the best approach. wait 10 days so that you are deleting 30 million records from a 60 million record table and then this will be much more efficient.

Time it some day though. A reader, November 12, - pm UTC. Tom, Recently I had conducted a interview in which one the dba mentioned that they had a table that might conatin 10 million records or might be 1 million.

He meant to say they delete the records and some time later the table will be populated again and viceversa. Tom according to you do you consider partitions for such tables and if yes which type of partition.. November 13, - pm UTC. hard to tell -- is the data deleted by something that is relatively constant eg: the value in that column doesn't change - so the row doesn't need to move from partition to partition.

If so -- sure, cause we could just drop partitions fast instead of deleting the data. I work with John Bittner, one of the previous reviewers. I second what he said absolutely. It is the only way to fly. addendum A reader, November 13, - am UTC. This process was introduced to our environment by a master tuner and personal friend, Larry Elkins.

This was a totally new paradigm for the application, and one that saved the entire mission-critical application. The in-place updates would not have worked with the terrabytes of data that we have in our database. How to Update millions or records in a table Boris Milrud, November 19, - pm UTC.

In response to the Jack Silvey from Richardson, TX review, where he wrote "It is the only way to fly. Thanks, Boris. November 19, - pm UTC. Thanks, Tom. submit calls. The only one difference between your code and mine is that I issue just one commit at the end.

It should not matter, right? I selected 1 mln. rows table and rebuild 5 non-partitioned indexes with 'compute statistics parallel nologging' clause. Here is the numbers I've got: rebuilding indexes sequentually consistently took 76 sec. submit calls took around 40 - 42 sec.

I said "around", because the technique I used may not be perfect, though it served the purpose. That's was the end time. In package I am writing, I do massive delete operation, then rebuilding indexes, then starting the next routine.

What would be the best way to detect the end of rebuiding, in order to proceed with the next call? You can even rebuild all the indexes in a partition simultaneously ramakrishna, November 21, - am UTC. We found this much faster than doing the indexes one by one.

We will now try out if we can submit multiple such jobs in parallel one for each partition of the table. regards ramakrishna. in case of deletes carl, November 29, - pm UTC. Hi Tom, Thanks so much for your web site and help. It is our number 1 reference in times of fear and loathing. This is what we came up with concerning mass updates INV 50M INVINS 10M INVDEL 7M There are indexes on INV. KEY and INVDEL. KEY ; alter table INVTMP logging; drop table INV; rename INVTMP to INV -- build indexs etc This is what we came up with and is to the fastest approach we've tested.

Any comments or suggestions are welcome and appreciated. November 30, - am UTC. in case of deletes - many thanks carl, December 01, - pm UTC. Ran the test cases at home K rows in INV and 50K rows in INVINS and INVDEL My way: A bit confused Choche, March 17, - am UTC. I was just wandering that none of the reviews made mention if these techniques could be applied in a multi-user environment where multiple users could be updating the same table at the same time.

March 17, - am UTC. sorry -- I though it obvious that in most cases "no" is the answer. we are copying the data or locking excessive amounts of it -- or disabling indexes and the like. This is a "batch" process here, to update millions of records. Replacing PK values Michael, July 25, - pm UTC.

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