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Edit & Sign PDF files online for free . Fill out PDF forms online . Change PDF text Add text to PDF . Edit existing PDF text . Add image to PDF Create links in PDF . Latches are internal serialization mechanisms used to protect shared data structures in Oracle s SGA. You can consider a latch as a type of lock that s held for an extremely short time period. Oracle has several types of latches, with each type guarding access to a specific set of data. The latch free wait event is incremented when a process can t get a latch on the first attempt. If a required Oracle latch isn t available, the process requesting it keeps spinning and retrying to gain the access. This spinning increases both the wait time and the CPU usage in the system. Oracle uses about 500 latches, but two of the important latches that show up in wait statistics are the shared pool latch (and the library cache latches) and the cache buffers LRU chain. It s normal to see a high number of latch free events in an instance. You should worry about this wait event only if the total time consumed by this event is high. High latch waits will show up in your AWR reports, or you can use the query shown in Listing 20-17 to find out your latch hit ratio. Listing 20-17. Determining the Latch Hit Ratio SQL> SELECT a.name "Latch Name", a.gets "Gets (Wait)", a.misses "Misses (Wait)", (1 - (misses / gets)) * 100 "Latch Hit Ratio %" FROM V$LATCH a WHERE a.gets != 0 UNION SELECT a.name "Latch Name", a.gets "Gets (Wait)", a.misses "Misses (Wait)", 100 "Latch Hit Ratio" pdf editor for android online: PDFzorro | edit pdf -files online pdf editor software online free 7 Best Free PDF Editors (Updated June 2019) - Lifewire
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Rating 5/10 FROM V$LATCH a WHERE agets = 0 ORDER BY 1; SQL> If the ratio isn t close to 1, it s time to think about tuning the latch contention in your instance There s only one shared pool latch for the database, and it protects the allocation of memory in the library cache The library cache latch regulates access to the objects present in the library cache Any SQL statement, PL/SQL code, procedure, function, or package needs to acquire this latch before execution If the shared pool and library cache latches are high, more often than not that s because the parse rates in the database are high. adobe convert word to pdf online: Word to PDF Converter - Convert Doc to PDF Online for Free pdf editor software online free Remove pages in PDF files online & free - Online PDF Converter
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This free online PDF editor allows you to add and edit texts, images and shapes in your ... It also works well on all systems devices: Windows, Mac , and Linux. The high parse rates are due to the following factors: An undersized shared pool Failure to use bind variables Using dissimilar SQL statements and failing to reuse statements Users frequently logging off and logging back into the application Failure to keep cursors open after each execution Using a shared pool size that s too large The cache buffers LRU chain latch free wait is caused by high buffer cache throughput, either due to full table scans or the use of unselective indexes, which lead to large index range scans Unselective indexes can also lead to yet another type of latch free wait: the cache buffer chain latch free wait These wait events are often due to the presence of hot blocks, so you need to investigate why that might be happening. will see a character on a sign tossing a red pixel into the trash. If you scrub across the timeline, the property keyframe at fame 35 is where the pixel changes direction, rotates, and starts to shrink. If you see a high value for row cache object latch waits, it indicates contention for the dictionary cache, and you need to increase the shared pool memory allocation In most instances, latch waits tend to show up as a wait event, and DBAs sometimes are alarmed by their very presence in the wait event list As with the other Oracle wait events, ask yourself this question: Are these latch waits a significant proportion of my total wait time If the answer is no, don t worry about it your goal isn t to try and eliminate all waits in the instance, because you can t do it.. free online pdf editor for windows 8 Remove PDF Metadata Online | PDFYeah
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