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for a fact that insert statement can t ever be reused later!!! If you use literals (constants) in the query, then every query is a brand-new query, never before seen by the database It will have to be parsed, qualified (names resolved), security-checked, optimized, and so on In short, each and every unique statement you execute will have to be compiled every time it is executed The second query uses a bind variable, :empno, the value of which is supplied at query execution time This query is compiled once and then the query plan is stored in a shared pool (the library cache), from which it can be retrieved and reused The difference between the two in terms of performance and scalability is huge, dramatic even. export qr code data to excel Generate QR code in Excel [SOLVED] - Excel Forum
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25 Dec 2018 ... Excel uses VBA (VB for application) language to do things programmatically. It's the focus of this article. For QR code generating , we uses ... The lock information to the right of the session ID describes the lock that the session is waiting for (not the lock it is holding). rdlc data matrix, ean 128 barcode c#, c# wpf preview pdf, vb.net word to pdf, create pdf thumbnail image c#, java upc-a qr code excel add in free qr code in excel 2003 erzeugen : Access Control in Software Draw ...
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The 2D XLS Font by IDAutomation generates Data Matrix, QR Code , ... 2D Font for use in Microsoft ® Excel ® Qr - Code Barcode Font in Excel ... qrcode barcode I learned that transactions were bad and that you ought to commit rapidly and never hold locks on data Concurrency came at the expense of consistency You either wanted to get it right or get it fast I came to believe that you couldn t have both When I moved on to Informix, things were better, but not by much As long as I remembered to create a table with row-level locking enabled, then I could actually have two people simultaneously insert data into that table Unfortunately, this concurrency came at a high price Row-level locks in the Informix implementation were expensive, both in terms of time and memory It took time to acquire and unacquire or release them, and each lock consumed real memory Also, the total number of locks available to the system had to be computed prior to starting the database. import qr code into excel Generate QR code in Excel [SOLVED] - Excel Help Forum
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30 Oct 2018 ... I'm an Excel beginner and I have to set up instructions on how to generate QR codes within Excel . I searched with google and get a lot of hits ... From the above description, it should be fairly obvious that parsing unique statements with hardcoded variables (called a hard parse) will take longer and consume many more resources than reusing an already parsed query plan (called a soft parse) What may not be so obvious is the extent to which the former will reduce the number of users your system can support Obviously, this is due in part to the increased resource consumption, but an even more significant factor arises due to the latching mechanisms for the library cache When you hard-parse a query, the database will spend more time holding certain low-level serialization devices called latches (see the chapter Locking and Latching for more details). The V$LOCK and the V$LOCK_HOLDERS views are very helpful in analyzing locks in your instance, but sometimes they take a long time to run. The V$SESSION view can provide a quick idea about the blocking sessions in your database. The blocking_session column of the V$SESSION view reveals the identity of the user who is holding the lock. The blocking_session_status column shows whether the blocking_session data is valid or not. For example, if you find the value VALID in the blocking_session_status column, it means that you ll find the SID of the blocking user under the blocking_session column. Here s a simple query that shows how to use the V$SESSION view to find out who is blocking a certain session: SQL> SELECT sid, blocking_session, username, event 2 FROM v$session 3* WHERE blocking_session_status = 'VALID'; SID BLOCKING_SESSION --- ---------------24 32 SQL> USERNAME -------SALAPATI EVENT ---------------------------------enq: TX - row lock contention The previous query shows that the user with the SID 24 is being blocked by user with the SID 32. The event column shows the type of lock that the blocking session holds. If you exceeded that number, then you were just out of luck Consequently, most tables were created with page-level locking anyway, and, as with SQL Server, both row and page-level locks would stop a query in its tracks As a result, I found that once again I would want to commit as fast as I could The bad habits I picked up using SQL Server. These latches protect the data structures in Oracle s shared memory from concurrent modifications by two sessions (otherwise Oracle would end up with corrupt data structures) and from someone reading a data structure while it is being modified The longer and more frequently you have to latch these data structures, the longer the queue to get these latches will become You will start to monopolize scarce resources Your machine may appear to be underutilized at times, and yet everything in the database is running very slowly The likelihood is that someone is holding one of these serialization mechanisms and a line is forming you are not able to run at top speed It only takes one ill-behaved application in your database to dramatically affect the performance of every other application. The data dictionary tables that you need to look at to find locking information are the DBA_LOCKS, DBA_BLOCKERS, and DBA_WAITERS views. If, for some reason, you don t see the DBA_BLOCKERS view, run the catblock.sql script, located in the $ORACLE_HOME/rdbms/admin directory, to create it. excel qr code generator Excel QR Code Generator - KeepEdge
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