Innodb history length

1. What is InnoDB history list length?
2. What is HLL mysql?
3. How does InnoDB check engine status?
4. What is InnoDB engine?
5. Why is the RDS so slow?
6. What is Aurora parallel query?
7. How do I improve my AWS RDS performance?
8. What is InnoDB buffer pool size?
9. What is status in MySQL?
10. How do I know what MySQL engine I have?
11. How do I view SQL Workbench history?
12. How do I view MySQL history in Linux?
13. When was InnoDB created?
14. Why do we use engine InnoDB?
15. Is MariaDB better than MySQL?

What is InnoDB history list length?

The InnoDB transaction system maintains a list of transactions that have index records delete-marked by UPDATE or DELETE operations. The length of the list is the purge lag.

What is HLL mysql?

The InnoDB history list length represents the number of unflushed changes. If your workload demands a lot of long running or open transactions, then you can expect to see a high HLL on the database.

How does InnoDB check engine status?

SHOW ENGINE INNODB STATUS is a specific form of the SHOW ENGINE statement that displays the InnoDB Monitor output, which is extensive InnoDB information which can be useful in diagnosing problems.

What is InnoDB engine?

InnoDB is a storage engine for the database management system MySQL and MariaDB. Since the release of MySQL 5.5. 5 in 2010, it replaced MyISAM as MySQL's default table type. It provides the standard ACID-compliant transaction features, along with foreign key support (Declarative Referential Integrity).

Why is the RDS so slow?

RDS is not slow. It may be marginally slower compared to your local mysql server since RDS is a remote instance. If you see it performing way too slow, then chances are that your RDS instance is running in a different availability zone than your EC2 instances.

What is Aurora parallel query?

Amazon Aurora Parallel Query is a feature of the Amazon Aurora database that provides faster analytical queries over your current data, without having to copy the data into a separate system.

How do I improve my AWS RDS performance?

An Amazon RDS performance best practice is to allocate enough RAM so that your working set resides almost completely in memory. The working set is the data and indexes that are frequently in use on your instance. The more you use the DB instance, the more the working set will grow.

What is InnoDB buffer pool size?

InnoDB buffer pool is the memory space that holds many in-memory data structures of InnoDB, buffers, caches, indexes and even row-data. innodb_buffer_pool_size is the MySQL configuration parameter that specifies the amount of memory allocated to the InnoDB buffer pool by MySQL.

What is status in MySQL?

SHOW STATUS; will give you status variables that have updated within your session. The command can also be expressed as SHOW SESSION STATUS; (As the MySQL Documentation says, it displays the status values for the current connection).

How do I know what MySQL engine I have?

If you're using MySQL Workbench, right-click a table and select alter table . In that window you can see your table Engine and also change it.

How do I view SQL Workbench history?

4 Answers. From the bottom panel, change "Action Output" to "History" and then choose the appropriate date. Alternatively, the SQL statement history is stored in text files under two locations: sql_history/yyyy-mm-dd e.g., sql_history/2015-04-01: Full Workbench SQL history for all MySQL connections.

How do I view MySQL history in Linux?

1 Answer. On Unix, the mysql client logs statements executed interactively to a history file. By default, this file is named . mysql_history in your home directory.

When was InnoDB created?

InnoDB was first released as a part of MySQL in 2001.

Why do we use engine InnoDB?

InnoDB is a general-purpose storage engine that balances high reliability and high performance. In MySQL 5.6, InnoDB is the default MySQL storage engine. Unless you have configured a different default storage engine, issuing a CREATE TABLE statement without an ENGINE clause creates an InnoDB table.

Is MariaDB better than MySQL?

Generally speaking, MariaDB shows improved speed when compared to MySQL. In particular, MariaDB offers better performance when it comes to views and handling flash storage through its RocksDB engine. MariaDB also outperforms MySQL when it comes to replication.