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https://dev.mysql.com/doc/refman/5.7/en/innodb-compression-internals.html
For example, this allows rows to be delete-marked and deleted without any compression operation. This section describes some internal implementation details about compression for InnoDB tables. The information presented here may be helpful in ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-file-defragmenting.html
Random insertions into or deletions from a secondary index can cause the index to become fragmented. If the insertions into an index are always ascending and records are deleted only from the end, the InnoDB filespace management algorithm ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking-reads.html
Other transactions can update or delete the same rows you just queried. Can you safely insert the child row to table CHILD? No, because some other session could delete the parent row in the moment between your SELECT and your INSERT, without you ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking.html
An exclusive (X) lock permits the transaction that holds the lock to update or delete a row. For example, SELECT c1 FROM t WHERE c1 = 10 FOR UPDATE; prevents any other transaction from inserting, updating, or deleting rows where the value of t.c1 is ...Shared and Exclusive Locks Intention Locks Record Locks Gap Locks Next-Key Locks Insert Intention Locks AUTO-INC Locks Predicate Locks for Spatial Indexes Shared and Exclusive Locks InnoDB implements standard row-level locking where there are two types of locks, shared (S) locks and exclusive (X) ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-migration.html
Issue this ALTER TABLE statement to delete the current .ibd file: ALTER TABLE tbl_name DISCARD TABLESPACE; Copy the backup .ibd file to the proper database directory. Purge has removed all delete-marked index records from the .ibd file. This ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-table-import.html
[Note] InnoDB: Stopping purge [Note] InnoDB: Writing table metadata to './test/t1.cfg' [Note] InnoDB: Table '"test"."t1"' flushed to disk When UNLOCK TABLES is run on the source instance: The binary .cfg file is deleted. Expected error log messages ... This section describes how to import tables using the Transportable Tablespaces feature, which permits importing tables, partitioned tables, or individual table partitions that reside in file-per-table ...
https://dev.mysql.com/doc/refman/5.7/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Reserved words are permitted as ...
https://dev.mysql.com/doc/refman/5.7/en/load-data.html
The file can be read from the server host or the client host, depending on whether the LOCAL modifier is given. INTO Statement”.) To write data from a table to a file, use SELECT ... To read the file back into a table, use LOAD DATA. The syntax of ...
https://dev.mysql.com/doc/refman/5.7/en/merge-storage-engine.html
You can use SELECT, DELETE, UPDATE, and INSERT on MERGE tables. You must have SELECT, DELETE, and UPDATE privileges on the MyISAM tables that you map to a MERGE table. The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection ...
https://dev.mysql.com/doc/refman/5.7/en/merge-table-problems.html
You should not use ANALYZE TABLE, REPAIR TABLE, OPTIMIZE TABLE, ALTER TABLE, DROP TABLE, DELETE without a WHERE clause, or TRUNCATE TABLE on any of the tables that are mapped into an open MERGE table. Windows does not permit open files to be ... The ...