statements in the oltp system, operations performed during the optimization process even take more time than data query. Therefore, it is necessary to use more bound variables in the OLTP system.
Appendix: Use of the tom runstat script1. Create a temporary table
Create or replace view stats
As select 'stat... '| a. name, B. value
From v $ statname a, v $ mystat B
Where a. statistic # = B. statistic #
Union all
Select 'latch. '| name, gets
From v $ la
{Console. log ("folder a does not exist ")}});
-----------------------------[Note: Then call the callback argument with either true or false(The value of this callback function is true or false)]
[File type determination] [fs. stat (), fs. lstat () and fs. fstat ()]// Stat. js-----------------------------
The Code is as follows:
Copy code
Var fs = require ("fs ");// Obtain the type of the folderFs. stat ("C: a", function (err, stat ){If (err ){Console. log ("the f
:1024Auto_eject_hosts:trueserver_retry_timeout:3000Server_failure_limit:3Servers-10.10.42.93:1978:1-10.10.42.93:2978:1-10.10.42.93:3978:1-10.10.42.93:4978:1start the Twemproxy service
Nutcracker- TTest configuration File Nutcracker- D - C /Usr/Src/Twemproxy/Conf/Nutcracker.yml- P /Usr/Src/Twemproxy/Run/Redisproxy.pid- o /Usr/Src/Twemproxy/Run/Redisproxy.log
Nutcracker Usage and command options
Usage:nutcracker [-?HVDDT] [-v verbosity level] [-O output file][-
A customer said a set of databases due to abnormal shutdown after the data export found error, EXPDP can not work correctly, after the error directly exit:
Working with Object Types Schema_export/job. . The "STATS" was exported. T_report_month_temps "988.2 MB 1292221 LinesORA-39014: One or more worker processes have exited prematurely.Ora-39029:worker Process 1 (Process name "DW01") prematurely terminatedOra-31672:worker process DW01 stopped unexpect
assigns a value to the CF variable in CTX. The NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;CF variable is of type Conf. The reason for this type is that the function used by the operation and the results obtained after parsing are included in the structure. Conf_create sets the function pointers and parsing types in CF first, then processes them, and finally saves the processed results in the ARG array of the Conf struct. Note: The contents of the last configuration file are all contained in the ARG arr
the memcache process. # Kill CAT/tmp/memcached. pid6. monitor whether the startup is successful. cmdc: \> Telnet 192.168.160.129 11211 directly hitting stats command 7. Set the Telnet access limit for memcache. Set the Telnet access limit, common concepts that enable memcached to access memcache only on transit hosts. memcached allocates memory in advance. The memory allocation method of memcached is called allocator. First, there are three concepts:
the binary lookup algorithm. The code is no longer listed.10.4 version: Get ()
The search function is called directly in dbimpl: Get (). The function prototype is:Status version: Get (const readoptions options, constlookupkey K, STD: string * value, getstats * stats)If this get operation contains more than one seek file (only at level 0), the first file to be searched is saved in stats. If stat returns d
记录健康检查的日志信息 Option Httpclose # # #每次请求完毕后主动关闭http通道 Option Httplog # # #日志类别http日志格式 Option Forwardfor # # #如果后端服务器需要获得客户端真实ip需要配置的参数, you can get the client IP from the HTTP header Option Redispatch # # #serverId对应的服务器挂掉后, force directed to other healthy servers timeout connect10000#default TenSecond timeoutifA backend isNot found timeout client300000# # #客户端连接超时 Timeout Server300000# # #服务器连接超时 Maxconn60000# # #最大连接数 Retries3# # #3次连接失败就认为服务不可用, you can also set ##########################
Looking for a long time today, how to see the value of Memcache directly in the server, to determine whether PHP Memcache has been written in theHttps://www.ttlsa.com/memcache/memcache-list-all-keys/This method is not only applicable to windowns cmd. Also applies to Linux command line operations, the following is the specific contentToday is doing a memcache session test, but in the process of testing, found that memcache there is no relatively simple way to directly like Redis, keys * List all
-S -A -L -D Daemon -r maximize core file limit -u -C -v Verbose output (print errors/warnings while in Eve NT loop) -VV more verbose output (also print client commands/reponses) -i print license information -P -T --------------------BerkeleyDB Options------------------------------- -M -A -H -l -C -T -s -e -e -b -D -N opens Db_txn_nosync for significant performance improvements, the default is off -R automatically deletes log files that are no longer needed, default is off test
Third, testi
Recently used Statspack on a customer's 8i production library and found an error in alert:
Mon June 16 13:17:52 2014
Errors in FILE/ORACLE/8.1.7/ADMIN/PROD/BDUMP/SNP0_96626_PROD.TRC:
Ora-12012:error on Auto execute of Job 304
Ora-01631:max # Extents (505) reached in table Perfstat. Stats$sql_summary
Ora-06512:at "Perfstat. Statspack ", line 978
Ora-06512:at "Perfstat. Statspack ", line 1612
Ora-06512:at "Perfstat. Statspack ", line 71
Ora-0651
Label:One, Oracle 11gThe automatic collection of statistics data is available in the 11g version of Oracle. One of the steps in deploying 11g Oracle software during deployment is to prompt for the ability to start this feature (which is enabled by default).Here's how to enable and disable this feature:1. View the tasks and status of automatically collecting statistics:Sql> select Client_name,status from Dba_autotask_client;
Client_name STATUS
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