Redis source code parsing (15th) --- aof-append only file parsing, redisaof-append

Redis source code parsing (15th) --- aof-append only file parsing, redisaof-append Continue to learn the code analysis of Data-related files under the redis source code. Today I am reading a file named aof, which is short for append ONLY file, only

Restore the database to see the "no exclusive access" solution (killing the database connection Stored Procedure sqlserver), stored procedure sqlserver

Restore the database to see the "no exclusive access" solution (killing the database connection Stored Procedure sqlserver), stored procedure sqlserver The stored procedure for creating a master database is as follows:Createproc killspid (@

ORA-00904: & quot; T1 & quot;. & quot; AREA_ID & quot;: Invalid identifier, ora-00904area_id

ORA-00904: "T1". "AREA_ID": Invalid identifier, ora-00904area_id 1. Error description ORA-00904: "T1". "AREA_ID": Invalid identifier 00904. 00000-"% s: invalid identifier" * Cause * Action An error occurred while listing 45 columns and 8

Install the oracle client in linux and the linuxoracle Client

Install the oracle client in linux and the linuxoracle Client 1. Prepare the required installation

Generate awr report and awr report

Generate awr report and awr report References: Http://343766868.blog.163.com/blog/static/48314056201110124513396/Overview Oracle stores critical system statistics and load information at a certain frequency to generate snapshots. All snapshots are

Mysql INNODB Engine lock principle test, mysqlinnodb engine lock

Mysql INNODB Engine lock principle test, mysqlinnodb engine lock How does mysql INNODB Engine lock work? Let's test it. Mysql> select version ();+ ----------- + | VERSION () | + ----------- + | 5.5.20 | + ----------- + 1 row in set (0.00

Index statistics collected bug, collected

Index statistics collected bug, collectedThe SQL Execution engine obtains the data that generates the optimal execution plan from the dictionary tables and views of related systems, such as pg_stats and pg_class. If the data in the dictionary view

SQL Server queries the remote database table data to the local database, sqldb

SQL Server queries the remote database table data to the local database, sqldbStep 1: Sp_configure 'show advanced options', 1; RECONFIGURE; sp_configure 'ad Hoc Distributed Queries ', 1; RECONFIGURE; GO Step 2: Insert into

ORACLE Database FAQ summary, oracle FAQ Summary

ORACLE Database FAQ summary, oracle FAQ Summary Prompt when submitting the transaction (solution for locking the database by a user) Select object_id, session_id, locked_mode from v $ locked_object; Select t2.username, t2.sid, t2.serial #, t2.logon

Archive logs and oracle archive logs

Archive logs and oracle archive logs RACSqlplus/as sysdbaSQL> alter system set cluster_database = false scope = spfile; -- in node1SQL> create pfile = '/opt/oracle/pfile_20120301' from spfile; -- in node1SQL> alter system set log_archive_format =

Archive logs (below), archive logs (

Archive logs (below), archive logs ( 1 SQL> archive log list; # Check whether the archive mode is used2 SQL> alter system set log_archive_start = true scope = spfile; # enable active ArchivingSQL> alter system set log_archive_dest = 'location

Like fuzzy query for oracle, mysql, db2, and SQL server in Mybatis, mybatisdb2

Like fuzzy query for oracle, mysql, db2, and SQL server in Mybatis, mybatisdb2 select * from t_user where user_name like CONCAT ('%', # {search_name}, '%') select * from t_user where user_name like '%' | # {search_name} | '%' select * from t_

Database startup (below), Database startup (

Database startup (below), Database startup ( 3. STARTUP This command completes the three steps of creating an instance, installing an instance, and opening a database. At this time, the database makes the data document and the re-log document online,

Lock (lower), lock (

Lock (lower), lock ( (2) Unlock MethodAlter system kill session '2010 3';/* 878,177 is SID, 878 is SERIAL #*/ Select/* + rule */s. username,Decode (l. type, 'Tm ', 'table lock', 'tx', 'row lock', null) lock_level,O. owner, o. object_name, o.

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Full-text index-comparison of two Chinese lexical analyzers (chinese_vgram_lexer chinese_lexer ),First, let's compare the Chinese Lexical analyzer. the test process is as follows:Create a table create table test (str varchar2(100)) ;create table

Start the database and start the oracle database

Start the database and start the oracle database Database STARTUP (STARTUP) Three steps are required to start a database: 1. Create an Oracle instance (not in the installation phase) 2. Database Installation By instance (installation phase) 3. Open

How can my son query their call records when he has a girlfriend? QQ1622863529, qq call records

How can my son query their call records when he has a girlfriend? QQ1622863529, qq call recordsQuery serviceConsult QQ: 1622863529 to query QQ chat records, chat content queries, QQ audio queries, video content queries, delete QQ chat records,

[MongoDB] The description of index (1), mongodbdescription

[MongoDB] The description of index (1), mongodbdescription From this blog, we start to talk about the index in mongo Database, which is similar to the traditional database. generally speaking, if the index need to be created in the traditional

Lock, lock

Lock, lock 1. view the current Lock ObjectSelect a. owner,A. object_name,B. xidusn,B. xidslot,B. xidsqn,B. session_id,B. oracle_username,B. OS _user_name,B. process,B. locked_mode,C. machine,C. status,C. server,C. sid,C. serial #,C. programFrom

Delete duplicate data

Delete duplicate dataDelete from cbe_subscriberWhere rowid! = (Select max (rowid)From cbe_subscriber BWhere a. SUBSCRIBERKEY = B. SUBSCRIBERKEYAnd a. APPLYTIME = B. APPLYTIME );ORACLE deletes duplicate data I have already tried it. [Line ].Delete

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