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CHAPTER 6 LOCKING AND LATCHING
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Further, the amount of CPU used by two users with bind variables is far less than half the amount of CPU a single user not using bind variables required! When I looked at the latch report in this statspack report, I found there was so little contention for the shared pool and library cache that it was not even worth reporting. In fact, digging deeper turned up the fact that the shared pool latch was requested 67,462 times versus well over 2.3 million times in the two-user test without binds shown above: Latch Name Requests Misses Sleeps Gets -------------------------- --------------- ------------ ----------- ----------shared pool 67,462 1,950 4 1,946 process allocation 8 1 1 0
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Table 6-1 summarizes the CPU usage by each implementation, as well as the latching results as we increase the number of users beyond two. As you can see, the solution using fewer latches will scale much better as the user load goes up. Table 6-1. CPU Usage Comparison with and Without Bind Variables
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No Binds Binds 4/0.17 13/0.33 30/0.53 44/0.68 58/0.90 64/1.03 79/1.27 89/1.45 103/1.60 110/1.73
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No Binds >1.1 million >2.3 million >3.4 million >4.5 million >5.6 million >6.8 million >8.0 million >9.1 million >10.2 million >11.3 million Binds 0 >67 thousand >111 thousand >126 thousand >167 thousand >175 thousand >220 thousand >234 thousand >268 thousand >281 thousand
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Latch Wait Count (/Latch Wait Time (sec)
No Binds* 0/0 15.8k/2 27.7k/5 51.4k/34 67.0k/142 81.8k/329 97.5k/548 113.3k/759 129.6k/989 147.2k/1,275 Binds 0/0 4/0 96/0 51/0 175/0 56/0 117/0 136/0 184/0 66/0
1 2 3 4 5 6 7 8 9 10
32/0.65 103/1.08 198/1.50 334/1.98 447/2.68 550/3.28 672/3.92 763/4.45 868/5.02 965/5.60
* Note: latch wait count is in thousands for No Binds and not so for Binds
The interesting observation is that 10 users using bind variables (and very few latch requests as a result) use the same amount of hardware resources (CPU) as 2 to 2.5 users that do not use bind variables (i.e., that overuse a latch or process more than they need to). When you examine the results for 10 users,
CHAPTER 6 LOCKING AND LATCHING
you see that nonuse of bind variables results in the use of almost 9 times the CPU and takes 3.3 times the execution time when compared to the bind variable solution. The more users are added over time, the longer each user spends waiting for these latches. We went from an average of 28 seconds/session (142 seconds of wait/5 sessions) of wait time for latches with 5 users to an average of 127 seconds/session of wait time with 10 users. However, the implementation that avoided overuse of the latch suffered no ill effects as it scaled up.
Mutexes
A mutex is a serialization device much like a latch is, in fact, the name mutex stands for mutual exclusion. It is another serialization tool used by the database; it was introduced in Oracle 10g Release 1 and is used in place of traditional latches in many places in the server. A mutex differs from a latch in that it is even more lightweight in its implementation. It requires less code to implement, approximately one-fifth of the instructions (which results in less CPU to request in general) and it requires less memory, approximately one-seventh of the size, to implement. A mutex, in addition to being lighter weight, is a little less functional in some respects. Just like an enqueue lock is much heavier than a latch, a latch is heavier than a mutex. But, like the enqueue to latch comparison, the latch can do more than a mutex in some cases (like an enqueue can do more than a latch in some cases). This means that not every latch will be, or should be, replaced by a mutex, just as every enqueue lock will not be, or should not be, replaced by a latch. When reading about mutexes in various reports, just remember that they are lighter-weight serialization devices. They enable possibly more scalability than a latch (just as latches are more scalable than enqueues), but they are still a serialization device. If you can avoid doing something that requires a mutex, in general, you should, for the same reason you would avoid requesting a latch if possible.
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