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Editorial Team
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Asked: 2026-05-24T16:10:50+00:00

I have a table that holds the card, which is described by the following

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I have a table that holds the card, which is described by the following attributes

Database: Oracle 11g

They USER_TABLE to many (- <) CARD

CARD

id NUMBER PK
name VARCHAR
card_number NUMBER
USER_ID NUMBER USER_TABLE FK

Probably the tables will store about 20 million records

In my application user (from the table USER_TABLE) is able to determine the order assigned to each card.

Cards by downloading through the query: SELECT * FROM CARD WHERE USER_ID =?

My idea to solve the problem of order:

1st
ORDER NUMBER adding an attribute that will determine the order. Unfortunately, after changing the order I have to update all user records.

2nd The addition of two attributes PREF NUMBER NEXT NUMBER. I Gain a little on operations where the card position changes by one, but in the worst case I update all the user cards.

My questions are as follows:

How to eliminate the problem of blockages in table?

Is there any better way to solve this problem?

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1 Answer

  1. Editorial Team

    Make your ordering id a FLOAT. Then you can modify the value to be between two pre-existing values.

    myID  myDataID  myOrder   =>   myID  myDataID  myOrder
 1       1        1.0     =>    1       1        1.0
 1       2        2.0     =>    1       2        2.0
 1       3        3.0     =>    1       3        1.5

    MyDataID 3 has now moved from being 3rd to being 2nd. And I have not had to update the myOrder values for any other records.

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