I recently used statspack on a 8i production database of the customer and found that alert has an error:
Mon Jun 16 13:17:52 2014Errors in file/oracle/8.1.7/admin/prod/bdump/snp0_96626_prod.trc:ORA-12012: error on auto execute of job 304ORA-01631: max # extents (505) reached in table PERFSTAT. STATS $ SQL _SUMMARYORA-06512: at "PERFSTAT. STATSPACK", line 978ORA-06512: at "PERFSTAT. STATSPACK", line 1612ORA-06512: at "PERFSTAT. STATSPACK", line 71ORA-0
has a parameter ("56000 "). Therefore, the query optimizer can automatically parameterize this query.
If you use the following SELECT statement to view a clean buffer pool that only contains the cache plan for the preceding statement, then you will see the query optimizer override the T-SQL Query into a parameterized T-SQL statement:
Select stats.exe cution_count as CNT,P. size_in_bytes as [size],[SQL]. [text] as [plan_text]From SYS. dm_exec_cached_plans POuter apply SYS. dm_e
The following is an automatic backup method that I have confirmed is available.
1. Choose Enterprise Manager> Manage> SQL server proxy.
2. Create a new job and take the job name as needed. For example, for data backup, select sa as the owner. Of course, you can select another user, provided that the user has the permission to execute the job;
3. Click the step tab to go to the step panel. Create a step. You can enter the step name as needed, such as step 1. The default type and database do not n
corresponding to the serverId is forcibly redirected to another server after it fails.
Retries 3 -- defines that the server is unavailable when the connection fails three times.Timeout http-request 10 sTimeout queue 1 mTimeout connect 10 s -- server connection timeoutTimeout client 1 m -- client Connection timeoutTimeout server 1 m -- server connection timeoutTimeout http-keep-alive 10 s -- persistent connectionTimeout check 10 s -- heartbeat check timeoutMaxconn 3000
Listen admin_status -- cu
The following is an automatic backup method that I have confirmed is available. For more information, see.
The following is an automatic backup method that I have confirmed is available. For more information, see.
The following is an automatic backup method that I have confirmed is available.
1. Choose Enterprise Manager> Manage> SQL server proxy.
2. Create a new job and take the job name as needed. For example, for data backup, select sa as the owner. Of course, you can select another user, pr
protocol to pause sending the data. Furthermore, the loopback network card is a virtual network card and does not require data to be sent to the register. In this function we simply count the length of the data and the number of packets, and then send the packet back to the upper layer protocol stack.Then the view state functionStatic struct net_device_stats *lo_get_stats (struct net_device *Dev) { struct net_ Device_stats *stats = dev->
Chroot/var/lib/haproxy pidfile/var/run/haproxy.p ID maxconn 4000 Stats socket/run/haproxy/admin.sock mode 660 level admin stats timeout 30s user Haproxy gr OUP haproxy Daemon # Default SSL material Locations Ca-base/etc/ssl/certs Crt-base/etc/ssl/private # Defa Ult ciphers to use on ssl-enabled listening sockets. # For more information, see Ciphers (1SSL). This list was from: # https://hynek.me/articles
roundrobin server mysql-1 10.0.0.1:3306 check server mysql-2 10.0.0.2:3306 checkUnlike HTTP load balancing HAProxy doesn ' t has a specific "mode" for MySQL so we use TCP. We ' ve set HAProxy to listen-only in the loopback address (assuming that application are on the same server) however if your Application resides on a different droplet make it listen on 0.0.0.0 or the private IP address.We need one more configuration block to see the statistics of the load balancing. This is completely
directories that could has a. htaccess file. Let's say added a. htaccess in/, Files/and images/. That ' s three. htaccess files. That ' s pretty typical.Now the numbers, that ' s 6 file system stats and 4 file system reads. Including one for the requested file. This happens for every read. We ' ll ignore parsing time because both Nginx and Apache need to does this and we'll consider the difference in time for this Negligible.
Requests [
is 224byte, and the stored data is only 200byte, and the remaining 24byte will be idle.To synthesize the above introduction, Memcached's memory allocation strategy is to allocate page according to slab requirements, each slab use chunk storage on demand.Here are a few features to note: memcached assigned page will not be reclaimed or redistributed memcached requested memory will not be released slab idle chunk will not be lent to any other slab useMemecached's static commandYou can use the stat
Memcached Statistics CommandStats Commandused to return statistical information such as PID (process number), version number, number of connections, and so on. Syntax:the basic syntax format for the stats command is as follows:Stats Stats Items Commandused to display the number of item in each slab and the length of storage (the number of seconds the last access distance is now). Syntax:the basic syntax for
interactions using commands:
6 633333STORED
As you can see, I use the extra integer value 6来 to invoke gets the command, and the operation runs in a very sequential order. Now let's take a look at the series of commands in Listing 7:Listing 7. Commands that use the old version designator cas
8 633333EXISTS
Note that I did not use gets the most recently returned integer value, and the cas command returned a EXISTS value in order to fail. In
memory used;Free: The total amount of idle physical memory;Buffer: The total amount of memory used for buffer;Cache: The total amount of memory used for the cache;SwapSI: Data rate for data entry into swap (KB/S)So: Data rate from swap (KB/S)Io:BI: The rate at which data is read into the system from the block device; (kb/s)Bo: The rate at which data is saved to a block device;System
In:interrupts, interrupt rate;Cs:context switch, process switching rate;Cpu
usSyIdWaSt
Pmap comman
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