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and CHECKPOINT LSN recorded in the log header are recorded in the log, the corresponding Mlog_checkpoint LSN is found and the LSN number scanned is recorded to recv_sys->mlog_checkpoint_lsnthe. (no such scan in version 5.6) Mlog_checkpoint was introduced in wl#7142 to simplify the logic of the InnoDB crash recovery, which, according to the wl#7142 description, contains several improvements: Avoid a crash recovery by reading the first page of each
: truncate cannot be restored (truncate directly clears data rows rather than adding deletion tags. You can view physical files and perform the truncate operation to reduce ibd files, after the delete operation is executed, the ibd file is as big as before. The drop operation cannot be restored (the data files are all gone. How can we restore them ?). 1. Install Percona Data Recovery Tool for InnoDB # Wget
Label:Recover a single InnoDB table from the Xtraback backup fileHttp://blog.sina.com.cn/s/blog_445e807b0101dbgw.htmlThe ability to recover a table is the premise that the standalone table space is turned on innodb_per_file_table=1Restore a InnoDB table (innodb_per_file_table)1> data error, but table not deleted (drop table, TRUNCATE table)A. Issue this ALTER TABLE statement:B. ALTER TABLE tbl_name DISCARD tablespace;Warning: This statement deletes the current.
Tags: names user name create user str backup restore Linux system create users emptyMySQL User managementCreate an authorized user and password? Grant all on the User1 ' identified by ' [email protected] ';The user who creates the connection management database in MySQL creates a user who can assign the appropriate permissions for the user to access the specified libraryCreate a user and authorize a user to access a library, have permission to access all the libraries locally, and view the perm
Tags: mysql account managementOne account Management1 Create an account:Example 1:Set up account ZWJ with all permissions on all databasesMysql> Grant All on * * to ' zwj ' @ ' 192.168.154.180 ';Query OK, 0 rows affected (0.01 sec)Set a password for ZWJMysql> Grant All on * * to ' zwj ' @ ' 192.168.154.180 ' identified by ' ZWJ ';Query OK, 0 rows Affected (0.00 sec)Example 2:Set up the user User01, permissions for all tables in the test library for Select, UPDATE, INSERT, delete operations, the
on from the local machine and grant this user the query permission for the test database. mysql> grant select on test. * to test1 @ 'localhost' identified by 'test123'; Query OK, 0 rows affected (0.03 sec) # create a user test2 to log on from any host on the Internet and grant this user the query permission for the test database mysql> grant select on test. * to test2 @ '%' identified by 'test234'; Query OK, 0 rows affected (0.02 sec) Refresh permission, and Query the permission of user test1 m
the GRANT, REVOKE, or drop user command to update the permission information to the memory structure at the same time. Ii. Permission assignment and Removal To authorize a user, you can use the GRANT command. To remove the existing permissions of a user, you can use the REVKOE command. to authorize the user, you must not only provide the user name, but also specify the host through which to access the user, the following is a simple column:# Create a user test1 to log on from the local machine
How to modify the IP address restrictions of an account in MySQL Preface Recently, I encountered a requirement in my work: To modify the permissions of MySQL users, you must restrict specific IP addresses for access. The first requirement was met, an error occurred when updating system permissions. The following is an example. Note:The following test environment is MySQL 5.6.20. If other versions differ from the following test results, refer to the actual environment. First, create a test user L
Establish a user, authorization database: mysql> create user ' Byrd ' @ ' localhost ' identified by ' admin123 '; #建立主机为localhost, the password is admin123 user ByrdQuery OK, 0 rows affected (0.05 sec)Mysql> show grants for ' Byrd ' @ ' localhost '; #查看byrd权限, usage indicates connection permissions+-------------------------------------------------------------------------------------------------------------+| Gran
Tags: tle This view grant use query PNG ROC nameMeet a demand today: Modify the permissions of the MySQL user, you need to restrict the specific IP address to access, the first encounter such a requirement, the results in the test process, the use of update system permission to find some problems, the following specific demonstration. The following test environment is for MySQL 5.6.20. If there is any discrepancy between the other versions and the test results below, please take the actual circu
/* Administrator Authorization */Grant Create session to zhangsan;//Grant Zhangsan user permission to create session, that is, login permissionGrant Unlimited session to zhangsan;//grants Zhangsan user permission to use tablespacesGrant CREATE table to zhangsan;//grants permissions for creating tablesGrante drop table to zhangsan;//grant permission to delete tablesGrant Insert table to zhangsan;//permission
table data. Like Oracle, INNODB's prepare process can be called recover (recovery), and the MyISAM data replication process can be called restore. Both the Xtrabackup and Innobackupex tools offer a number of features that are not mentioned in the previous article. The manual has http://www.linuxyw.comemail:[emailprotected] detailed descriptions of each function. In brief, these tools provide streaming (streaming) backups, incremental (incremental) backups, and so on, by replicating data files,
Information and user database table data and indexes, all tables are shared.. ibd Files: Single-table space files, each using a tablespace file (file per table) that holds user database table data and indexes.Log files: Ib_logfile1, Ib_logfile2############################################################################################################### #################################################InnoDB Storage engine management is based primari
Mysql toolkit is a small plug-in used to monitor and analyze databases. It is usually used to call perl to analyze and compare the current environment and database. It is worth learning. Http://www.percona.com/redir/downloads/percona-toolkit/LATEST/RPM/percona-toolkit-2.2.5-2.noarch.rpm The following software may need to be added during installation yum install -y perl-DBD-mysql perl-IO-Socket-SSLrpm -ivh percona-toolkit-2.2.5-2.noarch.rpm Command list /usr/bin/pt-agent/usr/bin/pt-align/usr/
Usage of mysqltoolkit [memo] bitsCN.com Mysql toolkit is a small plug-in used to monitor and analyze databases. it is usually used to call perl to analyze and compare the current environment and database. it is worth learning. Http://www.percona.com/redir/downloads/percona-toolkit/LATEST/RPM/percona-toolkit-2.2.5-2.noarch.rpm The following software may need to be added during installation yum install -y perl-DBD-mysql perl-IO-Socket-SSLrpm -ivh percona-toolkit-2.2.5-2.noarch.rpm Command list
Use hook_node_access_records and hook_node_grants (graphical combination (personal understanding is not authoritative, for reference only) to replace hook_node_access 1. First, we will introduce hook_node_access. It uses code writing to determine whether the user has the permission to access, edit, and delete a node, as shown below: function modulename_node_access($node, $op, $account) { // Here, the following results are returned based on your conditions. return NODE_ACCESS_IG
service mysqld start mysql-uroot-p Method Two: vim/etc/mysql/my.cnf skip_grant_tables service mysqld restart MySQL Mariad B [(none)]> use MySQL; MariaDB [mysql]> Update user set Password=password (' xm1234 ') where user= ' root '; MariaDB [mysql]> flush Privileges; MariaDB [mysql]> exit vim/etc/mysql/my.cnf skip_grant_tables Remove service mysqld restart Mysql-uroot-p3. User rights settings MySQL permissions category library level, table level, field level
Export the table structure with the EXP command and do not export the table data. Simply add a parameter rows=n to the command line. Indicates that table data is not exported. Exp username/pwd@sid file=d:databak.dmp owner= (user) Rows=n *************************************************************************************************************** ***** Oracle EXP/IMP Command detailedE:>exp help=y By entering the EXP command and user name/password, you canCommands after user/password: Exampl
touch the group all_sequencesdescription of sequences accessible to the user All_snapshotssnapshots the user can look in all_sourcecurrent source on stored objects This user is allowed to create all _synonymsall synonyms accessible to the user all_tablesdescription of tables accessible to the user All_tab_columnscolumns Of all tables, views and clusters all_tab_commentscomments in tables and views accessible to the user All_tab_grants_made User ' s grants
. Indicates that a tablePermissions List: Newly added connection users, access to the library that can operate, and permissions are represented as follows:All permissionscommand, command a permission (for example, select, INSERT, delete)Authorization library MySQL library records authorization information, uses different tables to record different authorization informationUse MySQLUser record the connection username that has been addedDB record the added connection user access to the libraryTabl
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