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https://dev.mysql.com/doc/refman/5.7/en/mysqlbinlog-row-events.html
# at 400 #080828 15:03:08 server id 1 end_log_pos 442 Delete_rows: table id 17 flags: STMT_END_F BINLOG ' fAS3SBMBAAAALAAAAJABAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ= fAS3SBkBAAAAKgAAALoBAAAQABEAAAAAAAEAA//4AQAAAARwZWFyIbIP '/*!*/; ### DELETE FROM ... The following examples illustrate how mysqlbinlog displays row events that specify data ...
https://dev.mysql.com/doc/refman/5.7/en/nested-join-optimization.html
Suppose that a join query over 3 tables T1,T2,T3 has this form: SELECT * FROM T1 INNER JOIN T2 ON P1(T1,T2) INNER JOIN T3 ON P2(T2,T3) WHERE P(T1,T2,T3) Here, P1(T1,T2) and P2(T3,T3) are some join conditions (on expressions), whereas P(T1,T2,T3) is ...The following discussion refers to the join syntax described in Section 13.2.9.2, “JOIN ...
https://dev.mysql.com/doc/refman/5.7/en/repair-table.html
REPAIR TABLE Output REPAIR TABLE returns a result set with the columns shown in the following table. Column Value Table The table name Op Always repair Msg_type status, error, info, note, or warning Msg_text An informational message The REPAIR TABLE ...[QUICK] [EXTENDED] [USE_FRM] REPAIR TABLE repairs a possibly corrupted table, for certain storage engines ...
https://dev.mysql.com/doc/refman/5.7/en/select-into.html
Column and line terminators can be specified to produce a specific output format. Alternatively, if the MySQL client software is installed on the remote host, you can use a client command such as mysql -e "SELECT ..." > file_name to generate the ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-types.html
MySQL spatial extensions enable the generation, storage, and analysis of geographic features: Data types for representing spatial values Functions for manipulating spatial values Spatial indexing for improved access times to spatial columns The ...A ... The Open Geospatial Consortium (OGC) is an international consortium of more than 250 companies, agencies, and universities participating in the development of publicly available conceptual solutions that can be useful with all kinds of applications that manage spatial ...
https://dev.mysql.com/doc/refman/5.7/en/bnl-bka-optimization.html
Suppose that join buffer B1 is employed to join tables t1 and t2 and the result of this operation is joined with table t3 using join buffer B2: A regular join buffer contains columns from each join operand. If B2 is a regular join buffer, each row r ... In MySQL, a Batched Key Access (BKA) Join algorithm is available that uses both index access to the joined table and a join ...
https://dev.mysql.com/doc/refman/5.7/en/engine-condition-pushdown-optimization.html
This optimization improves the efficiency of direct comparisons between a nonindexed column and a constant. (An index access method would be more efficient and so would be chosen in preference to condition pushdown.) Engine condition pushdown ...In ...
https://dev.mysql.com/doc/refman/5.7/en/group-by-optimization.html
The most important preconditions for using indexes for GROUP BY are that all GROUP BY columns reference attributes from the same index, and that the index stores its keys in order (as is true, for example, for a BTREE index, but not for a HASH ...
https://dev.mysql.com/doc/refman/5.7/en/identifier-qualifiers.html
ON mydb.mytable ...; A column name may be given multiple qualifiers to indicate context in statements that reference it, as shown in the following table. Suppose that column c1 occurs only in table t1, c2 only in t2, and c in both t1 and t2. Suppose ...An unqualified name is permitted in contexts where interpretation of the name is ...
https://dev.mysql.com/doc/refman/5.7/en/known-issues.html
DISTINCT with ORDER BY does not work inside GROUP_CONCAT() if you do not use all and only those columns that are in the DISTINCT list. When inserting a big integer value (between 263 and 264−1) into a decimal or string column, it is inserted as a ... This section lists known issues in recent versions of ...