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Oracle使用RMAN复制数据库

作者：暗影HK4164286 | 来源：互联网 | 2018-06-05 05:52

1.使用RMAN创建数据库副本使用RMAN的DUPLICATE命令可根据目标数据库备份创建数据库副本。创建数据库副本：1.创建辅助实例的Oracle口令文件。2.建立到辅助实例的OracleNet连接。3.创建辅助实例的初始化参数文件。4.在NOMOUNT模式下启动

1.使用 RMAN 创建数据库副本使用 RMAN 的 DUPLICATE 命令可根据目标数据库备份创建数据库副本。创建数据库副本： 1.创建辅助实例的 Oracle 口令文件。 2. 建立到辅助实例的 Oracle Net 连接。 3. 创建辅助实例的初始化参数文件。 4.在 NOMOUNT 模式下启动

1.使用 RMAN 创建数据库副本

使用 RMAN 的 DUPLICATE 命令可根据目标数据库备份创建数据库副本。

创建数据库副本：

1.创建辅助实例的 Oracle 口令文件。
2.
建立到辅助实例的 Oracle Net 连接。
3.
创建辅助实例的初始化参数文件。

4.在 NOMOUNT 模式下启动辅助实例。
5.
装载或打开目标数据库。

6.确保备份和归档重做日志文件可用。

7.根据需要分配辅助通道。

8.执行 DUPLICATE 命令。

创建辅助实例的初始化参数文件：

请按如下方式指定参数：

DB_NAME
如果数据库副本与目标数据库在同一 Oracle 主目录中，则它们的名称必须不同。
在 DUPLICATE 命令中使用相同&＃20540;。

DB_BLOCK_SIZE
指定的&＃20540;应与为目标数据库设置的&＃20540;相同。

指定用于控制文件命名的参数：
指定下列参数可控制辅助数据库的文件命名：

CONTROL_FILES

DB_FILE_NAME_CONVERT

LOG_FILE_NAME_CONVERT

在 NOMOUNT 模式下启动实例：
在 NOMOUNT 模式下启动辅助实例。
根据用来启动实例的文本初始化参数文件创建服务器参数文件 (SPFILE)。

确保备份和归档重做日志文件可用：

在副本主机上必须能访问所有目标数据库数据文件的备份。

备份可以是完全备份和增量备份的组合。

在副本主机上必须能访问恢复数据库副本所需的归档重做日志文件。

归档重做日志文件可以是：

--介质管理器上的备份

--映像副本

--实际的归档重做日志文件

分配辅助通道：

使用 RMAN 的 DUPLICATE 命令：
RMAN> RUN

{ALLOCATE AUXILIARY CHANNEL aux1 DEVICE TYPE DISK;

ALLOCATE AUXILIARY CHANNEL aux2 DEVICE TYPE DISK;

…

DUPLICATE TARGET DATABASE to auxdb;

}

当您执行 DUPLICATE 命令时，RMAN 会执行下列操作：

1.创建数据库副本的控制文件
2.
将目标数据文件还原到数据库副本

3.使用所有可用的增量备份和归档重做日志文件执行不完全恢复

4.关闭辅助实例后又重新启动它

5.通过 RESETLOGS 选项打开数据库副本

6.创建联机重做日志文件

7.为数据库副本生成新的唯一 DBID

指定 DUPLICATE 命令的选项
请在执行 DUPLICATE 命令时根据需要指定其它选项。

SKIP READONLY：用于排除只读表空间数据文件。

SKIP TABLESPACE：用于从目标数据库中排除表空间。不能排除 SYSTEM 表空间或包含还原段或回退段的表空间。

NOFILENAMECHECK：用于防止 RMAN 检查目标数据库数据文件是否与正在使用的数据库副本数据文件同名。当目标数据库和数据库副本的数据文件和重做日志文件使用相同的名称时，必须指定此选项。当创建数据库副本的主机具有与目标数据库主机一样的磁盘配置、目录结构和文件名时，通常使用此选项。如果这种情况下未指定 NOFILENAMECHECK，RMAN 会返回错误。

OPEN RESTRICTED：用于在数据库打开之后自动启用 RESTRICTED SESSION。

具体实验：

1.1. 复制数据库

1.1.1. 创建源库备份

[oracle@ocmu ~]$ rman target /

Recovery Manager: Release 11.2.0.1.0 - Production on Sun Mar 31 15:39:16 2013

connected to target database: ORA11GR2 (DBID=116453860)

RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;

using target database control file instead of recovery catalog

new RMAN configuration parameters:

CONFIGURE CONTROLFILE AUTOBACKUP ON;

new RMAN configuration parameters are successfully stored

RMAN> BACKUP DATABASE PLUS ARCHIVELOG;

Starting backup at 31-MAR-13

current log archived

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=20 device type=DISK

channel ORA_DISK_1: starting archived log backup set

channel ORA_DISK_1: specifying archived log(s) in backup set

input archived log thread=1 sequence=8 RECID=1 STAMP=811520735

input archived log thread=1 sequence=9 RECID=2 STAMP=811520750

input archived log thread=1 sequence=10 RECID=3 STAMP=811520772

input archived log thread=1 sequence=11 RECID=4 STAMP=811520783

input archived log thread=1 sequence=12 RECID=5 STAMP=811520796

input archived log thread=1 sequence=13 RECID=6 STAMP=811525192

channel ORA_DISK_1: starting piece 1 at 31-MAR-13

channel ORA_DISK_1: finished piece 1 at 31-MAR-13

piece handle=/u01/app/FRA/ORA11GR2/backupset/2013_03_31/o1_mf_annnn_TAG20130331T153953_8oht29yn_.bkp tag=TAG20130331T153953 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:01:04

Finished backup at 31-MAR-13

Starting backup at 31-MAR-13

using channel ORA_DISK_1

channel ORA_DISK_1: starting full datafile backup set

channel ORA_DISK_1: specifying datafile(s) in backup set

input datafile file number=00001 name=/u01/app/oracle/oradata/ORA11GR2/system01.dbf

input datafile file number=00002 name=/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf

input datafile file number=00003 name=/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf

input datafile file number=00005 name=/u01/app/oracle/oradata/ORA11GR2/example01.dbf

input datafile file number=00004 name=/u01/app/oracle/oradata/ORA11GR2/users01.dbf

channel ORA_DISK_1: starting piece 1 at 31-MAR-13

channel ORA_DISK_1: finished piece 1 at 31-MAR-13

piece handle=/u01/app/FRA/ORA11GR2/backupset/2013_03_31/o1_mf_nnndf_TAG20130331T154059_8oht4jr1_.bkp tag=TAG20130331T154059 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:04:33

Finished backup at 31-MAR-13

Starting backup at 31-MAR-13

current log archived

using channel ORA_DISK_1

channel ORA_DISK_1: starting archived log backup set

channel ORA_DISK_1: specifying archived log(s) in backup set

input archived log thread=1 sequence=14 RECID=7 STAMP=811525533

channel ORA_DISK_1: starting piece 1 at 31-MAR-13

channel ORA_DISK_1: finished piece 1 at 31-MAR-13

piece handle=/u01/app/FRA/ORA11GR2/backupset/2013_03_31/o1_mf_annnn_TAG20130331T154533_8ohtdxrl_.bkp tag=TAG20130331T154533 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01

Finished backup at 31-MAR-13

Starting Control File and SPFILE Autobackup at 31-MAR-13

piece handle=/u01/app/FRA/ORA11GR2/autobackup/2013_03_31/o1_mf_s_811525535_8ohtf2n9_.bkp comment=NONE

Finished Control File and SPFILE Autobackup at 31-MAR-13

RMAN>

1.1.2. 目标服务器上复制数据库

1) 创建密码文件

[oracle@ocmu ~]$ cd $ORACLE_HOME/dbs

[oracle@ocmu dbs]$ orapwd file= orapwORA11GR2 password=oracle entries=10

[oracle@ocmu dbs]$ ls orapw*

orapwORA11GR2

[oracle@ocmu dbs]$

2) 编辑tnsnames

[oracle@ocmu ~]$ cd $ORACLE_HOME/network/admin

[oracle@ocmu admin]$ vi tnsnames.ora

ORA11GR2 =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = ocmu)(PORT = 1521))

)

(CONNECT_DATA =

(ORACLE_SID = ORA11GR2)

)

3) 将源库的pfile文件拷贝到目标数据库

[oracle@ocmu ~]$ cd $ORACLE_HOME/dbs

[oracle@ocmu dbs]$

scp 192.168.1.200:/u01/app/oracle/product/11.2.0/db_1/dbs/initORA11GR2.ora .

The authenticity of host '192.168.1.200 (192.168.1.200)' can't be established.

RSA key fingerprint is 35:b3:59:37:e6:a1:3b:34:7d:01:84:ee:5d:9b:48:24.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.1.200' (RSA) to the list of known hosts.

oracle@192.168.1.200's password:

initORA11GR2.ora 100% 948 0.9KB/s 00:00

[oracle@ocmu dbs]$

4) 创建相关目录

--创建数据文件存放目录

[oracle@ocmu ~]$ mkdir -p /u01/app/oracle/oradata/ORA11GR2

--创建快速恢复区目录

[oracle@ocmu ~]$ mkdir -p /u01/app/FRA/ORA11GR2

--创建admup转储目录

[oracle@ocmu ~]$ mkdir -p /u01/app/oracle/admin/ORA11GR2/adump

5) 将源库快速恢复区内容拷贝到目标库

[oracle@ocmu ~]$ cd /u01/app/FRA/ORA11GR2

[oracle@ocmu ORA11GR2]$ ls

[oracle@ocmu ORA11GR2]$

scp -r 192.168.1.200:/u01/app/FRA/ORA11GR2/archivelog .

oracle@192.168.1.200's password:

o1_mf_1_12_8ohorqkc_.arc 100% 48MB 24.1MB/s 00:02

o1_mf_1_11_8ohorc4n_.arc 100% 48MB 24.1MB/s 00:02

o1_mf_1_9_8ohoq8dx_.arc 100% 46MB 3.8MB/s 00:12

o1_mf_1_14_8ohtdx3d_.arc 100% 357KB 357.0KB/s 00:00

o1_mf_1_13_8oht26d8_.arc 100% 21MB 21.1MB/s 00:01

o1_mf_1_10_8ohoqxot_.arc 100% 48MB 24.1MB/s 00:02

o1_mf_1_8_8ohops0g_.arc 100% 44MB 3.1MB/s 00:14

[oracle@ocmu ORA11GR2]$

scp -r 192.168.1.200:/u01/app/FRA/ORA11GR2/autobackup .

oracle@192.168.1.200's password:

o1_mf_s_811525535_8ohtf2n9_.bkp 100% 9600KB 9.4MB/s 00:01

[oracle@ocmu ORA11GR2]$

scp -r 192.168.1.200:/u01/app/FRA/ORA11GR2/backupset .

oracle@192.168.1.200's password:

o1_mf_annnn_TAG20130331T153953_8oht29yn_.bkp 100% 256MB 9.8MB/s 00:26

o1_mf_nnndf_TAG20130331T154059_8oht4jr1_.bkp 100% 1142MB 7.7MB/s 02:29

o1_mf_annnn_TAG20130331T154533_8ohtdxrl_.bkp 100% 359KB 358.5KB/s 00:00

[oracle@ocmu ORA11GR2]$

6) 目标库启动到nomount模式

[oracle@ocmu ~]$ export ORACLE_SID=ORA11GR2

[oracle@ocmu ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Sun Mar 31 16:29:42 2013

Connected to an idle instance.

SQL> startup nomount;

ORACLE instance started.

Total System Global Area 841162752 bytes

Fixed Size 1339768 bytes

Variable Size 532680328 bytes

Database Buffers 301989888 bytes

Redo Buffers 5152768 bytes

SQL>

7) 目标库运行duplicate命令

[oracle@ocmu ~]$ export ORACLE_SID=ORA11GR2

[oracle@ocmu ~]$ rman target sys/oracle@ora11gr2 auxiliary /

Recovery Manager: Release 11.2.0.1.0 - Production on Sun Mar 31 16:48:18 2013

connected to target database: ORA11GR2 (DBID=116453860)

connected to auxiliary database: ORA11GR2 (not mounted)

RMAN> duplicate target database to ORA11GR2 pfile =/u01/app/oracle/product/11.2.0/db_1/dbs/initORA11GR2.ora

logfile

'/u01/app/oracle/oradata/ORA11GR2/redo01.log' size 50m,

'/u01/app/oracle/oradata/ORA11GR2/redo02.log' size 50m,

'/u01/app/oracle/oradata/ORA11GR2/redo03.log' size 50m

NOFILENAMECHECK;

Starting Duplicate Db at 31-MAR-13

using target database control file instead of recovery catalog

allocated channel: ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: SID=20 device type=DISK

contents of Memory Script:

{

sql clone "alter system set db_name =

''ORA11GR2'' comment=

''Modified by RMAN duplicate'' scope=spfile";

sql clone "alter system set db_unique_name =

''ORA11GR2'' comment=

''Modified by RMAN duplicate'' scope=spfile";

shutdown clone immediate;

startup clone force nomount

restore clone primary controlfile;

alter clone database mount;

}

executing Memory Script

sql statement: alter system set db_name = ''ORA11GR2'' comment= ''Modified by RMAN duplicate'' scope=spfile

sql statement: alter system set db_unique_name = ''ORA11GR2'' comment= ''Modified by RMAN duplicate'' scope=spfile

Oracle instance shut down

Oracle instance started

Total System Global Area 841162752 bytes

Fixed Size 1339768 bytes

Variable Size 536874632 bytes

Database Buffers 297795584 bytes

Redo Buffers 5152768 bytes

Starting restore at 31-MAR-13

allocated channel: ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: SID=18 device type=DISK

channel ORA_AUX_DISK_1: starting datafile backup set restore

channel ORA_AUX_DISK_1: restoring control file

channel ORA_AUX_DISK_1: reading from backup piece /u01/app/FRA/ORA11GR2/autobackup/2013_03_31/o1_mf_s_811525535_8ohtf2n9_.bkp

channel ORA_AUX_DISK_1: piece handle=/u01/app/FRA/ORA11GR2/autobackup/2013_03_31/o1_mf_s_811525535_8ohtf2n9_.bkp tag=TAG20130331T154535

channel ORA_AUX_DISK_1: restored backup piece 1

channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:03

output file name=/u01/app/oracle/oradata/ORA11GR2/control01.ctl

output file name=/u01/app/oracle/oradata/ORA11GR2/control02.ctl

Finished restore at 31-MAR-13

database mounted

contents of Memory Script:

{

set until scn 893076;

set newname for datafile 1 to

"/u01/app/oracle/oradata/ORA11GR2/system01.dbf";

set newname for datafile 2 to

"/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf";

set newname for datafile 3 to

"/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf";

set newname for datafile 4 to

"/u01/app/oracle/oradata/ORA11GR2/users01.dbf";

set newname for datafile 5 to

"/u01/app/oracle/oradata/ORA11GR2/example01.dbf";

restore

clone database

;

}

executing Memory Script

executing command: SET until clause

executing command: SET NEWNAME

Starting restore at 31-MAR-13

using channel ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: starting datafile backup set restore

channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set

channel ORA_AUX_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/ORA11GR2/system01.dbf

channel ORA_AUX_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf

channel ORA_AUX_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf

channel ORA_AUX_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/ORA11GR2/users01.dbf

channel ORA_AUX_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/ORA11GR2/example01.dbf

channel ORA_AUX_DISK_1: reading from backup piece /u01/app/FRA/ORA11GR2/backupset/2013_03_31/o1_mf_nnndf_TAG20130331T154059_8oht4jr1_.bkp

channel ORA_AUX_DISK_1: piece handle=/u01/app/FRA/ORA11GR2/backupset/2013_03_31/o1_mf_nnndf_TAG20130331T154059_8oht4jr1_.bkp tag=TAG20130331T154059

channel ORA_AUX_DISK_1: restored backup piece 1

channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:02:36

Finished restore at 31-MAR-13

contents of Memory Script:

{

switch clone datafile all;

}

executing Memory Script

datafile 1 switched to datafile copy

input datafile copy RECID=2 STAMP=811529474 file name=/u01/app/oracle/oradata/ORA11GR2/system01.dbf

datafile 2 switched to datafile copy

input datafile copy RECID=3 STAMP=811529474 file name=/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf

datafile 3 switched to datafile copy

input datafile copy RECID=4 STAMP=811529474 file name=/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf

datafile 4 switched to datafile copy

input datafile copy RECID=5 STAMP=811529474 file name=/u01/app/oracle/oradata/ORA11GR2/users01.dbf

datafile 5 switched to datafile copy

input datafile copy RECID=6 STAMP=811529474 file name=/u01/app/oracle/oradata/ORA11GR2/example01.dbf

contents of Memory Script:

{

set until scn 893076;

recover

clone database

delete archivelog

;

}

executing Memory Script

executing command: SET until clause

Starting recover at 31-MAR-13

using channel ORA_AUX_DISK_1

starting media recovery

archived log for thread 1 with sequence 14 is already on disk as file /u01/app/FRA/ORA11GR2/archivelog/2013_03_31/o1_mf_1_14_8ohtdx3d_.arc

archived log file name=/u01/app/FRA/ORA11GR2/archivelog/2013_03_31/o1_mf_1_14_8ohtdx3d_.arc thread=1 sequence=14

media recovery complete, elapsed time: 00:00:04

Finished recover at 31-MAR-13

contents of Memory Script:

{

shutdown clone immediate;

startup clone nomount pfile= '/u01/app/oracle/product/11.2.0/db_1/dbs/initORA11GR2.ora';

}

executing Memory Script

database dismounted

Oracle instance shut down

connected to auxiliary database (not started)

Oracle instance started

Total System Global Area 841162752 bytes

Fixed Size 1339768 bytes

Variable Size 532680328 bytes

Database Buffers 301989888 bytes

Redo Buffers 5152768 bytes

sql statement: CREATE CONTROLFILE REUSE SET DATABASE "ORA11GR2" RESETLOGS ARCHIVELOG

MAXLOGFILES 16

MAXLOGMEMBERS 3

MAXDATAFILES 100

MAXINSTANCES 8

MAXLOGHISTORY 292

LOGFILE

GROUP 1 '/u01/app/oracle/oradata/ORA11GR2/redo01.log' SIZE 50 M ,

GROUP 2 '/u01/app/oracle/oradata/ORA11GR2/redo02.log' SIZE 50 M ,

GROUP 3 '/u01/app/oracle/oradata/ORA11GR2/redo03.log' SIZE 50 M

DATAFILE

'/u01/app/oracle/oradata/ORA11GR2/system01.dbf'

CHARACTER SET AL32UTF8

contents of Memory Script:

{

set newname for tempfile 1 to

"/u01/app/oracle/oradata/ORA11GR2/temp01.dbf";

switch clone tempfile all;

catalog clone datafilecopy "/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf",

"/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf",

"/u01/app/oracle/oradata/ORA11GR2/users01.dbf",

"/u01/app/oracle/oradata/ORA11GR2/example01.dbf";

switch clone datafile all;

}

executing Memory Script

executing command: SET NEWNAME

renamed tempfile 1 to /u01/app/oracle/oradata/ORA11GR2/temp01.dbf in control file

cataloged datafile copy

datafile copy file name=/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf RECID=1 STAMP=811529493

cataloged datafile copy

datafile copy file name=/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf RECID=2 STAMP=811529493

cataloged datafile copy

datafile copy file name=/u01/app/oracle/oradata/ORA11GR2/users01.dbf RECID=3 STAMP=811529493

cataloged datafile copy

datafile copy file name=/u01/app/oracle/oradata/ORA11GR2/example01.dbf RECID=4 STAMP=811529493

datafile 2 switched to datafile copy

input datafile copy RECID=1 STAMP=811529493 file name=/u01/app/oracle/oradata/ORA11GR2/sysaux01.dbf

datafile 3 switched to datafile copy

input datafile copy RECID=2 STAMP=811529493 file name=/u01/app/oracle/oradata/ORA11GR2/undotbs01.dbf

datafile 4 switched to datafile copy

input datafile copy RECID=3 STAMP=811529493 file name=/u01/app/oracle/oradata/ORA11GR2/users01.dbf

datafile 5 switched to datafile copy

input datafile copy RECID=4 STAMP=811529493 file name=/u01/app/oracle/oradata/ORA11GR2/example01.dbf

contents of Memory Script:

{

Alter clone database open resetlogs;

}

executing Memory Script

database opened

Finished Duplicate Db at 31-MAR-13

RMAN>

2.使用EM复制数据库

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本文详细介绍了如何将 Nacos 0.3 的数据持久化到 MySQL 数据库，并提供了具体的步骤和注意事项。 ... [详细]

蜡笔小新 2024-11-14 18:26:40
数据库
DB2 9 认证指南（733 测验）第二部分：数据处理

本文介绍 DB2 中的基本概念，重点解释事务单元（UOW）和事务的概念。事务单元是指作为单个原子操作执行的一个或多个 SQL 查询。 ... [详细]

蜡笔小新 2024-11-14 16:58:15
数据库
HTTP header 介绍

HTTP(HyperTextTransferProtocol)是超文本传输协议的缩写，它用于传送www方式的数据。HTTP协议采用了请求响应模型。客服端向服务器发送一 ... [详细]

蜡笔小新 2024-11-14 09:13:00
sql
日志处理流程：Flume+MapReduce+Hive+Sqoop+MySQL

本文介绍了如何使用Flume从Linux文件系统收集日志并存储到HDFS，然后通过MapReduce清洗数据，使用Hive进行数据分析，并最终通过Sqoop将结果导出到MySQL数据库。 ... [详细]

蜡笔小新 2024-11-13 18:47:34
redis
从0到1搭建大数据平台

从0到1搭建大数据平台 ... [详细]

蜡笔小新 2024-11-12 15:26:03
redis
javascript分页类支持页码格式

前端时间因为项目需要，要对一个产品下所有的附属图片进行分页显示，没考虑ajax一张张请求，所以干脆一次性全部把图片out，然 ... [详细]

蜡笔小新 2024-11-12 14:58:57
数据库
彻底清除数据库中的所有用户表（包括删除相关表结构）

在处理数据库中所有用户表的彻底清除时，目前尚未发现单一命令能够实现这一目标。因此，需要采用一种较为繁琐的方法来逐个删除相关表及其结构。具体操作可以通过编写PL/SQL脚本来实现，该脚本将动态生成并执行删除表的SQL语句。尽管这种方法相对复杂，但在缺乏更简便手段的情况下，仍是一种有效的解决方案。未来或许可以通过数据库管理工具或更高版本的数据库系统提供更简洁的处理方式。 ... [详细]

蜡笔小新 2024-11-11 18:30:49
数据库
8个IDC大数据基础定义解析丨IDC

本文针对IDC数据行业相关名词术语进行解析，分为4组相关概念，希望大家读完 ... [详细]

蜡笔小新 2024-11-16 18:25:46
sql
Spring与Hibernate集成详解

本文详细介绍了如何将Spring框架与Hibernate ORM框架进行集成，包括配置文件的设置和数据持久化操作的实现。 ... [详细]

蜡笔小新 2024-11-15 18:26:01
insert
周排行与月排行榜开发总结

本文详细介绍了如何在PHP中实现周排行和月排行榜的开发，包括数据库设计、数据记录和查询方法。涉及的知识点包括MySQL的GROUP BY、WEEK和MONTH函数。 ... [详细]

蜡笔小新 2024-11-14 19:14:58
数据库
如何在不同数据库中提取前N%的记录

本文详细介绍了如何在SQL Server、Oracle和MySQL等不同数据库中提取前N%的记录。通过具体的示例和代码，帮助读者理解和掌握这些方法。 ... [详细]

蜡笔小新 2024-11-14 18:51:20

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