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| Exam Code: | 1Z0-888 |
| Exam Name: | MySQL 5.7 Database Administrator |
| Certification Provider: | Oracle |
| Free Question Number: | 49 |
| Version: | v2018-11-12 |
| Rating: | |
| # of views: | 1797 |
| # of Questions views: | 38121 |
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No.# 14.6.3.4 Undo Tablespaces
Undo tablespaces contain undo logs, which are collections of undo log records that contain information about how to undo the latest change by a transaction to a clustered index record. Undo logs exist within undo log segments, which are contained within rollback segments. The innodb_rollback_segments variable defines the number of rollback segments allocated to each undo tablespace.
Undo logs can be stored in one or more undo tablespaces instead of the system tablespace. This layout differs from the default configuration in which undo logs reside in the system tablespace. The I/O patterns for undo logs make undo tablespaces good candidates for SSD storage, while keeping the system tablespace on hard disk storage.
The number of undo tablespaces used by InnoDB is controlled by the innodb_undo_tablespaces configuration option. This option can only be configured when initializing the MySQL instance. It cannot be changed afterward.
No.# Controls how often the MySQL server synchronizes the binary log to disk.
sync_binlog=0: Disables synchronization of the binary log to disk by the MySQL server. Instead, the MySQL server relies on the operating system to flush the binary log to disk from time to time as it does for any other file. This setting provides the best performance, but in the event of a power failure or operating system crash, it is possible that the server has committed transactions that have not been synchronized to the binary log.
sync_binlog=1: Enables synchronization of the binary log to disk before transactions are committed. This is the safest setting but can have a negative impact on performance due to the increased number of disk writes. In the event of a power failure or operating system crash, transactions that are missing from the binary log are only in a prepared state. This permits the automatic recovery routine to roll back the transactions, which guarantees that no transaction is lost from the binary log.
sync_binlog=N, where N is a value other than 0 or 1: The binary log is synchronized to disk after N binary log commit groups have been collected. In the event of a power failure or operating system crash, it is possible that the server has committed transactions that have not been flushed to the binary log. This setting can have a negative impact on performance due to the increased number of disk writes. A higher value improves performance, but with an increased risk of data loss.
For the greatest possible durability and consistency in a replication setup that uses InnoDB with transactions, use these settings:
sync_binlog=1.
innodb_flush_log_at_trx_commit=1.
No.# A -> query excution
B --> parser
C --> optimizer
D --> optimizer
E --> Authorization
E --> Optimizer
F --> Parser
optimizer : createan optimal excution plan for each query, this involvees deciding which indexes to use and in which order to process the tables.
No.# answer is C,D.E
No.# Because of this, you must have the DROP privilege for a table before you can execute ALTER TABLE ... DROP PARTITION on that table.
If you wish to drop all data from all partitions while preserving the table definition and its partitioning scheme, use the TRUNCATE TABLE statement. (See Section 13.1.34, “TRUNCATE TABLE Statement”.)
If you intend to change the partitioning of a table without losing data, use ALTER TABLE ... REORGANIZE PARTITION instead. See below or in Section 13.1.8, “ALTER TABLE Statement”, for information about REORGANIZE PARTITION.
No.# This variable controls server-side LOCAL capability for LOAD DATA statements. Depending on the local_infile setting, the server refuses or permits local data loading by clients that have LOCAL enabled on the client side.
To explicitly cause the server to refuse or permit LOAD DATA LOCAL statements (regardless of how client programs and libraries are configured at build time or runtime), start mysqld with local_infile disabled or enabled, respectively. local_infile can also be set at runtime. For more information, see Section 6.1.6, “Security Considerations for LOAD DATA LOCAL”.
No.# To make inadvertent use of the mysql_clear_password plugin less likely, MySQL clients must explicitly enable it. This can be done in several ways:
Set the LIBMYSQL_ENABLE_CLEARTEXT_PLUGIN environment variable to a value that begins with 1, Y, or y. This enables the plugin for all client connections.
The mysql, mysqladmin, and mysqlslap client programs (also mysqlcheck, mysqldump, and mysqlshow for MySQL 5.7.10 and later) support an --enable-cleartext-plugin option that enables the plugin on a per-invocation basis.
No.# Property Value
Command-Line Format --key-buffer-size=#
System Variable key_buffer_size
Scope Global
Dynamic Yes
SET_VAR Hint Applies No
Type Integer
Default Value 8388608
Minimum Value 8
Maximum Value (64-bit platforms) OS_PER_PROCESS_LIMIT
Maximum Value (32-bit platforms) 4294967295
No.# Property Value
Command-Line Format --key-buffer-size=#
System Variable key_buffer_size
Scope Global
Dynamic Yes
SET_VAR Hint Applies No
Type Integer
Default Value 8388608
Minimum Value 8
Maximum Value (64-bit platforms) OS_PER_PROCESS_LIMIT
Maximum Value (32-bit platforms) 4294967295
No.# C is not correct. I think A is the correct anwser. I take the exam with C option and it is not correct.
No.# From the error it's quite obvious you have to turned off
Set the value of innodb_adaptive_hash_indexto zero.