IPhone applicationsDevelopmentDataPersistence is the content to be introduced in this article, mainly to learnIphone applicationsMediumDataLibrary usage. For details, see the details.
1. plist
Limitation: only the data types supported by this tool can be serialized and stored in plist. Other Cocoa objects cannot be stored in plist, or custom object storage.
Supported Data types: Array, Dictionary, Boolean, Data, Date, Number, and String.
Xml file data type ~ Where the basic Data is Boolean, Dat
study the path of the archive, the method of archiving, the method of reading the document (annotated with two different classes, one is the archive class, one is the class of reading files)The stored data is stored in binary form on the phone's local/** Save data for archiving */-(Ibaction) SAVEBTN: (ID) Sender {NSString *filepath = [self filepathwithfilename:@ "student.archive"];Nsmutabledata *thedata = [Nsmutabledata data];Nskeyedarchiver *archiver
Tags: Oracle ora-00257 Oracle Connection Error ResolutionOra-00257:archiver error. Connect internal only, until freed. Cause:the archiver Process received a error while trying to archive a redo log. If the problem is not resolved soon, the database would stop executing transactions. The most likely cause of the "this message" is the destination device was out of space to store the redo log file. Action:chec
Because of the temporary requirements, we have to use Java to develop a webservice, before the Java WebService a blank. Temporary search information, the cost of nearly a day, finally fix, efficiency is slow point. Oh.First configure the WebService parsing container in tomcat, download axis2-1.6.2Note Download the two files of the red box separatelyNote that Axis2.war is extracted from axis2-1.6.2-war.zip, placed in Tomcat WebApps, and then entered in the browser http://localhost:8080/axis2/Test
1.pt-archiverFunction Introduction:Archive records from tables in a MySQL database to another table or fileUsage Introduction:Pt-archiver [OPTION ...]--source DSN--where whereThis tool simply archives old data and does not have much impact on OLTP queries on online data, you can insert data into other tables in another server, or write to a file to facilitate importing data using the Load Data infile command. Alternatively, you can use it to perform a
maximize the number of deleted rows without affecting the performance of the business library.2. Use the Pt-archiver in Percona tools to clean up outdated data, do data archiving, or you can do bothBe aware that the parameters are--Limit the--Txn-size thePerformance tuning parameter specific values can be tested for tuning optimizations, as many transaction submissions as possible to improve execution efficiency.1) Clean up outdated datapt-
Process Monitor performs process recovery when a user process fails. Pmon is responsible for cleaning up the cache and freeing resources, the process was using. Pmon also checks on the dispatcher processes (described later in this table) and server processes and restarts them if the Y has failed.
archiver (Arcn)
one or more Archiver Processes copy the redo log files to archival
WAFWeb Application Firewall and WEB Application Firewall (WAF) are not popular in the global market? Mr. Grant Murphy, global product market manager of barracuda WAF, is clear, but the situation may not be the same for the Chinese market.
WAF truth: IPS and IDS are not WAF
First, Chinese customers lack knowledge about WAF.
Through communication with agents, Grant Murphy learned an interesting phenomenon. What is obviously different from foreign countr
InnoDB: Completed initialization of buffer pool130413 13:45:12 InnoDB: highest supported file format is Barracuda.130413 13:45:12 InnoDB: Waiting for the background threads to start130413 13:45:13 InnoDB: 5.5.30 started; log sequence number 1595675130413 13:45:13 [Note] Server hostname (bind-address): '0. 0.0.0 '; port: 3306130413 13:45:13 [Note]-'0. 0.0.0 'resolves to '0. 0.0.0 ';130413 13:45:13 [Note] Server socket created on IP: '0. 0.0.0 '.130413
Tags: Email Firewall, telephone repair
History repeats itself.
On the morning of Monday (Oct 27), everything seemed normal. I saw my colleague's email and was busy with my head. My colleagues in the office soon told me that the files scanned from the copier couldn't be received in the mailbox. I tried it. I wrote a blog post about the same situation before (it seems that the record is indeed useful :). So I checked the Exchange Server immediately. Everything went fine. Then I checked the
: innodb_log_group_home_dir =. /xtrabackup: innodb_log_files_in_group = 1 xtrabackup: innodb_log_file_size = 2097152130327 14:40:53 InnoDB: Using Linux native aioxtrabackup: Starting InnoDB instance for recovery. Xtrabackup: Using 104857600 bytes for Buffer Pool (set by -- use-memory parameter) 130327 14:40:53 InnoDB: the InnoDB memory heap is disabled130327 14:40:53 InnoDB: mutexes and rw_locks use InnoDB's own implementation130327 14:40:53 InnoDB: Compressed tables use zlib 1.2.3130327 14:40:5
, or configure the firewall accordingly.
Common errors and solutions:
1. [mysql] ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql. sock' (2)
This error occurs because the mysql server is not started.
Previously, I configured master-slave according to 5.0x, and then started slave. this error will be reported when I connect to slave.
The reason was that mysql slave was not started, and then the error log was queried and the following fields were found.
110505
the business or frequently accessed.
2. facilitate the implementation of cache solutions and data product migration
The Key-volume Value data type is not a strong point for MySQL.
After the TEXT is split into a table with a simple structure such as K-V, it is very convenient to realize the migration of data products by modifying less code.
Whether it's Mongo's _ id: value, redis's string, or memcached's key-value, you can easily import data.
In addition, aside from the cache scheme, you can al
' doesn' t exist140509 22:08:46 mysqld_safe mysqld from pid file/var/lib/mysql/mysqld1.clvn.com.cn. pid ended
Solution
[Root @ mysqld1 mysql] # scripts/mysql_install_db -- user = mysqlInstalling MySQL system tables... 22:51:12 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use -- explicit_defaults_for_timestamp server option (see documentation for more details ).22:51:12 3564 [Note] InnoDB: Using atomics to ref count buffer pool pages22:51:12 3564 [Note] InnoDB: The In
:33 5624 [Note] InnoDB: Highest supported file format is Barracuda.2014-04-22 19:11:33 5624 [Note] InnoDB: 128 rollback segment(s) are active.2014-04-22 19:11:33 5624 [Note] InnoDB: Waiting for purge to start2014-04-22 19:11:33 5624 [Note] InnoDB: 5.6.17 started; log sequence number 16006072014-04-22 19:11:33 5624 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUI
security hardening.The MySQL database in this document is based on the Mysql-5.5.33-win32.msi version.1. Network Management relatedBackground informationThe modified content of network management is to improve the performance of network management. This part of the content of CS network has practical significance, ezview in use even if not added, there has been no exception. However, when recovering CS data, it is necessary to increase this part of the content, otherwise it is possible that the
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