Using data tab causes SD blacklist users! Why is this happening?
Several SQL Developer users in our working group have recently been blacklisted by our COMPUTER service for the filing of applications between large tables for hours. Many of these users said emphatically that they had not submitted ALL requests. Finally someone has theorized that by clicking the data tab to display multiple lines of data can cause SD to submit a select * query to Oracle. Yikes! There are now hundreds of users out there using SD with more to come on board each week within the company. Can such an innocuous action click on a tab actually cause this problem and if so how to prevent overall SD to do this?>
If what people are saying about this forum is true, that unbeknownst to the user, by clicking on the data tab, in the background, submit a select * to the entire table, then the SD software should be smart enough and courteous enough give the user a warning and the choice to continue or to limit the number of lines delevered! No ifs, ANDS or goals in this regard.
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The number of rows retrieved in fact whenever the server uses the parameter preferably 'Sql Fetch Array size'. By default, this setting is "50". You access it by ' tools-> preferences-> database-> advanced.
The user can choose to scroll through the lines as much as desired. If the user does no scrolling beyond 50 lines then no lines is extracted.
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It is precisely this that developer SQL must do out of the box!
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And that IS what SQL does "out of the box" program
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Several SQL Developer users in our working group have recently been blacklisted by our COMPUTER service for the filing of applications between large tables for hours. Many of these users said emphatically that they had not submitted ALL requests. Finally someone has theorized that by clicking the data tab to display multiple lines of data can cause SD to submit a select * query Oracle
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A ' SELECT * FROM MaTable "query does NOT run for hours. This query will almost always perform a full table of the table scan since rarely any index contains ALL the columns in the table whose columns NULL (null columns are not indexed by index piles; only by bitmap indexes).
A full table (without an ORDER BY to sort the data) scan bed simply all the blocks of the table. Reading won't stop any other user/session to execute any DML they need.
A user can choose to SORT the data, and in this case Oracle will sort the array INTEGER BEFORE it can return data to the user. A sort can certainly use a lot of resources in the background and can certainly hinder other sessions/users who need these resources.
But the question of the SORT applies to ANY tool used including 'SQL Assistant'. No tools exist that can feed 20 lines sorted to the user BEFORE the data has been sorted. And no tools exist which can exercise ANY control over the process of sorting of Oracle. The tool will get all the data until sorting is 100 percent complete.
Always make sure you are comparing the same use case when you make comparisons like that.
1. Basic use of the selection of a data tab sql developer issues a select * FROM... query for backup
2. If the filter options have NOT changed to include the query will run very quickly and extract the first 50 lines of sorting. Additional lines will be taken ONLY if the user asks for them.
3 pure SELECT * QUERY does NOT work for hours on the backend.
4. ANY tool which issues a select * FROM... ORDER BY query causes Oracle perform a full table scan.
5. the probable cause of what appears to be a simple SELECT * QUERY is usually a user who selects the tab data and then go home for the weekend, leaving their machine. This query will remain the library cache and the session will remain, but there is no real activity or resource use.
If you have evidence that flies in the face of the foregoing, please view details.
As mentioned by another reviewer, the user CAN perform
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