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Developers’ mDay u Banjoj Luci - Bogdan Kecman, Oracle – MySQL Server 8.0
1.
Copyright © 2016,
Oracle and/or its affiliates. All rights reserved. | MySQL Server 8.0 Bogdan Kecman bogdan.kecman@oracle.com
2.
3.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | Safe Harbor Statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle. 3
4.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | MySQL 5.7 – Improvements across the board • Replication • InnoDB • Optimizer • Security • Performance Schema • GIS • Triggers • Partitioning • New! SYS Schema • New! JSON • Performance 4
5.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 5 The MySQL 5.7 Story (cont.) JSON Type JSON Functions Virtual Columns GIS Improvements Observability Manageability
6.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | GIS • Geography Support • Spatial Reference Systems (SRS) Support • SQL/MM Information Schema views • Standard compliant axis ordering in import/export functions • Helper functions to manipulate and convert data: • st_x(geom, x) • st_y(geom, y) • st_srid(geom, srid) 6
7.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | JSON Functions 7 MySQL 5.7 and 8.0 JSON_ARRAY_APPEND() JSON_ARRAY_INSERT() JSON_ARRAY() JSON_CONTAINS_PATH() JSON_CONTAINS() JSON_DEPTH() JSON_EXTRACT() JSON_INSERT() JSON_KEYS() JSON_LENGTH() JSON_MERGE() JSON_OBJECT() JSON_QUOTE() JSON_REMOVE() JSON_REPLACE() JSON_SEARCH() JSON_SET() JSON_TYPE() JSON_UNQUOTE() JSON_VALID() JSON_PRETTY() JSON_STORAGE_SIZE() JSON_STORAGE_FREE() JSON_ARRAYAGG() JSON_OBJECTAGG()
8.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | JSON Developer Experience • Ranges in JSON path expressions: • Optimizer Support for in-place update • Performance Improvements 8 MySQL 8.0 SELECT doc->>"$[last]" AS last from t1; +------+ | last | +------+ | 5 | +------+ 1 row in set (0.00 sec) SELECT JSON_EXTRACT('[1, 2, 3, 4, 5]', '$[1 to 3]'); +----------------------------------------------+ | JSON_EXTRACT('[1, 2, 3, 4, 5]', '$[1 to 3]') | +----------------------------------------------+ | [2, 3, 4] | +----------------------------------------------+ 1 row in set (0.00 sec)
9.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | utfmb4 as default character set • Support for the latest Unicode 9.0 • Accent and case sensitive collations • Language specific collations • including Japanese! 9 MySQL 8.0
10.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | UTF-8 • UTF-8 is the dominating character set in today’s applications • Requires 1-4 bytes for storing characters • Historically a performance problem The character set for the Web 10 https://en.wikipedia.org/wiki/UTF-8
11.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | MySQL 8.0 vs MySQL 5.7 utf8mb4 11 0 45000 90000 135000 180000 8 16 64 128 512 1024 SELECT DISTINCT_RANGES 0 10000 20000 30000 40000 8 16 64 128 512 1024 OLTP RO 0 7500 15000 22500 30000 8 16 64 128 512 1024 OLTP RW +300-350% in OLTP RO +176-233% in OLTP RW +1500-1800% in SELECT DISTINCT_RANGES
12.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | MySQL 8.0 utf8mb4 vs MySQL 5.7 utf8mb3 12 0 45000 90000 135000 180000 8 16 64 128 512 1024 SELECT DISTINCT_RANGES 0 10000 20000 30000 40000 8 16 64 128 512 1024 OLTP RO 0 7500 15000 22500 30000 8 16 64 128 512 1024 OLTP RW +270-340% in OLTP RO +150-200% in OLTP RW +1300-1600% in SELECT DISTINCT_RANGES
13.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! UUID and Bit-wise Improvements • Functions to convert UUID to and from binary: – UUID_TO_BIN() – BIN_TO_UUID() – plus IS_UUID() • Bit-wise operations on binary data types • Bit-wise operations on binary data types – Designed with IPv6 in mind: – INET6_ATON(address) & INET6_ATON(network) 13 Feature Request from Developers
14.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | UUID_TO_BIN Optimization 14 24.75 25.5 26.25 27. 27.75 28.5 29.25 Insert Performance Optimized Original • Binary format is now smaller and insert-order efficient: 11e678fe53303f87a4778c89a52c4f3b 53303f87-78fe-11e6-a477-8c89a52c4f3bFrom VARCHAR(36) To VARBINARY(16)
15.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Better Handing of Hot Rows 15 SELECT seat_no FROM seats JOIN seat_rows USING ( row_no ) WHERE seat_no IN (3,4) AND seat_rows.row_no IN (12) AND booked = 'NO' FOR UPDATE OF seats SKIP LOCKED FOR SHARE OF seat_rows NOWAIT; Non deterministically skip over locked rows Error immediately if a row is already locked Feature Request from Developers
16.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Common Table Expressions • “With queries” • Both Recursive and Non-Recursive Forms • Simplifies writing complex SQL: WITH t1 AS (SELECT * FROM tblA WHERE a=‘b’) SELECT * FROM t1; 16 Feature Request from Developers
17.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 17 Print 1 to 10 Recursive CTE (Example) a 1 2 3 4 5 6 7 8 9 10 WITH RECURSIVE qn AS ( SELECT 1 AS a UNION ALL SELECT 1+a FROM qn WHERE a<10 ) SELECT * FROM qn;
18.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Window Functions 18 Improving Support for Analytics Feature Request from Developers SELECT name, department_id, salary, SUM(salary) OVER (PARTITION BY department_id) AS department_total FROM employee ORDER BY department_id, name;
19.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 19 Improved to consider buffer pool fit Optimizer Cost Model Feature Request from DBAs SELECT * FROM Country WHERE population > 20000000; Model for a table scan: # pages in table * (IO_BLOCK_READ_COST | MEMORY_BLOCK_READ_COST) # records * ROW_EVALUATE_COST = 25.4 100% in memory = 29.9 100% on disk Model for a range scan: # records_in_range * (IO_BLOCK_READ_COST | MEMORY_BLOCK_READ_COS T) # records_in_range * ROW_EVALUATE_COST + # records_in_range * ROW_EVALUATE_COST = 22.5 100% in memory = 60 100% on disk Model accounts for memory fit. For data on disk an IO block read defaults to 1.0. In memory defaults to 0.25. Much larger performance difference for range scan not in memory (good)
20.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Descending Indexes CREATE TABLE t1 ( a INT, b INT, INDEX a_desc_b_asc (a DESC, b ASC) ); 21 For B+tree indexes mysql> EXPLAIN SELECT * FROM t1 ORDER BY a DESC, b ASC; .. +--------------+---------+------+------+----------+-------------+ .. | key | key_len | ref | rows | filtered | Extra | .. +--------------+---------+------+------+----------+-------------+ .. | a_desc_b_asc | 10 | NULL | 10 | 100.00 | Using index | .. +--------------+---------+------+------+----------+-------------+ mysql 8.0> EXPLAIN SELECT * FROM t1 ORDER BY a ASC, b ASC; .. +--------------+---------+------+------+----------+-----------------------------+ .. | key | key_len | ref | rows | filtered | Extra | .. +--------------+---------+------+------+----------+-----------------------------+ .. | a_desc_b_asc | 10 | NULL | 10 | 100.00 | Using index; Using filesort | .. +--------------+---------+------+------+----------+-----------------------------+
21.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Invisible Indexes • Indexes are “hidden” to the MySQL Optimizer – Not the same as “disabled indexes” – Contents are fully up to date and maintained by DML • Two use cases: – Soft Delete (Recycle Bin) – Staged Rollout 22 Feature Request from DBAs
22.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 23 Example Usage Soft Delete • I don’t think this index is used any more: ALTER TABLE Country ALTER INDEX c INVISIBLE; • I need to revert: ALTER TABLE Country ALTER INDEX c VISIBLE; • It is now safe to drop: ALTER TABLE Country DROP INDEX c;
23.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | Staged Rollout • Adding any new index can change existing execution plans • All change introduces risk of regression ALTER TABLE Country ADD INDEX c (Continent) INVISIBLE; # after some time ALTER TABLE Country ALTER INDEX c VISIBLE; 24
24.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 25 SELECT * FROM information_schema.statistics WHERE is_visible='NO'; *************************** 1. row *************************** TABLE_CATALOG: def TABLE_SCHEMA: world TABLE_NAME: Country NON_UNIQUE: 1 INDEX_SCHEMA: world INDEX_NAME: c SEQ_IN_INDEX: 1 COLUMN_NAME: Continent COLLATION: A CARDINALITY: 7 SUB_PART: NULL PACKED: NULL NULLABLE: INDEX_TYPE: BTREE COMMENT: disabled INDEX_COMMENT: IS_VISIBLE: NO
25.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! MySQL Roles Improving MySQL Access Controls • Introduced in the 8.0.0 DMR • Easier to manage user and applications rights • As standards compliant as practically possible • Multiple default roles • Can export the role graph in GraphML 26 Feature Request from DBAs Directly In directly Set Role(s) Default Role(s) Set of ACLS Set of ACLS
26.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Atomic ACL Statements • Long standing MySQL issue! – For Replication, HA, Backups, etc. • Possible now - ACL tables reside in InnoDB Data Dictionary • Not just a table operation: memory caches need update too • Applies to statements performing multiple logical operations, e.g. – CREATE USER u1, u2 – GRANT SELECT ON *.* TO u1, u2 • Uses a custom MDL lock to block ACL related activity – While altering the ACL caches and tables 27 Feature Request from DBAs
27.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Dynamic Privileges Provides finer grained administrative level access controls • Too often super is required for tasks when less privilege is really needed – Support concept of “least privilege” • Needed to allow adding administrative access controls – Now can come with new components – Examples • Replication • HA • Backup • Give us your ideas 28
28.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! InnoDB Redo and Undo Encryption • AES 256 encryption • Encrypted when redo/undo log data is written to disk • Decryption occurs when redo/undo log data is read from disk • Once redo/undo log data is read into memory, it is in unencrypted form. • Two tiered encryption – like Innodb tablepace encryption – Fast key rotation, high performance • Easy to use – Enabled using innodb_redo_log_encrypt and innodb_undo_log_encrypt 29 Feature Request from DBAs
29.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 30 Evolution from MySQL 5.5 to 8.0 Performance Schema Feature Request from DBAs MySQL 8.0 Histograms Indexes Data Locks instrumentation SQL Errors instrumentation Variables Instrumentation Table plugin Improved Defaults MySQL 5.7 Memory Instrumentation Prepared Statements Instrumentation Transactions Instrumentation Scalable Memory Allocation Bundled SYS schema Lower Overhead MySQL 5.6 Statement Instrumentation Lower Overhead MySQL 5.5 Event Waits Mutexes Files Threads
30.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 31 Performance Comparison 0. 10. 20. 30. 40. Query Time MySQL 8.0 MySQL 5.7 Over 30x faster! SELECT * FROM sys.session 1000 active sessions Time in Seconds (Lower is better)
31.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 32 SELECT * FROM test.no_table; ERROR 1146 (42S02): Table 'test.no_table' doesn't exist SELECT * FROM performance_schema.events_errors_summary_global_by_error WHERE sum_error_handled > 0 OR SUM_ERROR_RAISED > 0G *************************** 1. row *************************** ERROR_NUMBER: 1146 ERROR_NAME: ER_NO_SUCH_TABLE SQL_STATE: 42S02 SUM_ERROR_RAISED: 1 SUM_ERROR_HANDLED: 0 FIRST_SEEN: 2016-09-11 20:52:42 LAST_SEEN: 2016-09-11 20:52:42 1 row in set (0.00 sec)
32.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | query: INSERT INTO `t1` VALUES (...) db: mysqlslap total_latency: 54.43 s exec_count: 58377 lock_latency: 1.70 s .. digest: 4e0c5b796c4052b0da4548fd7cb694be first_seen: 2017-04-16 20:59:16 last_seen: 2017-04-16 21:00:34 latency_distribution: 0us+ 10us+ ############################# 100us+ #################### 1ms+ # 10ms+ 100ms+ 1s+ 10s+ New! Performance Schema Histograms 33 +---------+--------------------------------+-------+ | bucket | visualization | count | +---------+--------------------------------+-------+ | 0us+ | # | 1253 | | 10us+ | ############################## | 43102 | | 100us+ | ################# | 25013 | | 1ms+ | # | 2003 | | 10ms+ | | 325 | | 100ms+ | | 17 | | 1s+ | | 0 | | 10s+ | | 0 | +---------+--------------------------------+-------+ 8 rows in set (0.08 sec) Showing distribution of query time from a run of mysqlslap Generated with a quick CTE over events_statements_histogram _global Feature Request from DBAs Available on a per statement digest level. Can quickly aggregate top-N statements with latency distribution.
33.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Performance Schema Data Locks 34 SELECT thread_id, object_name, index_name, lock_type, lock_mode, lock_data FROM performance_schema.data_locks WHERE object_name = 'seats'; +-----------+-------------+------------+-----------+-----------+-----------+ | thread_id | object_name | index_name | lock_type | lock_mode | lock_data | +-----------+-------------+------------+-----------+-----------+-----------+ | 33 | seats | NULL | TABLE | IX | NULL | | 33 | seats | PRIMARY | RECORD | X | 3, 5 | | 33 | seats | PRIMARY | RECORD | X | 3, 6 | | 33 | seats | PRIMARY | RECORD | X | 4, 5 | | 33 | seats | PRIMARY | RECORD | X | 4, 6 | +-----------+-------------+------------+-----------+-----------+-----------+ 5 rows in set (0.00 sec) Feature Request from DBAs
34.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 35 New! Persist Configuration • Persist GLOBAL Server Variables – SET PERSIST max_connections = 500; – SET PERSIST_ONLY innodb_log_file_size = 128*1024*1024; • Examples Include: – Offline_mode – Read_Only • Requires no filesystem access Cloud Friendly
35.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Variables Info 36 Find the source of variables changed on your installation SELECT * FROM performance_schema.variables_info WHERE variable_source != 'COMPILED'; +------------------------+-----------------+--------------------+-----------+-----------+---------------------+----------+-----------+ | VARIABLE_NAME | VARIABLE_SOURCE | VARIABLE_PATH | MIN_VALUE | MAX_VALUE | SET_TIME | SET_USER | SET_HOST | +------------------------+-----------------+--------------------+-----------+-----------+---------------------+----------+-----------+ | autocommit | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | basedir | COMMAND_LINE | | 0 | 0 | 2017-04-16 21:08:11 | | | | bind_address | EXPLICIT | [..]my.sandbox.cnf | 0 | 0 | 2017-04-16 21:08:11 | | | | character_set_client | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | character_set_results | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | collation_connection | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | datadir | COMMAND_LINE | | 0 | 0 | 2017-04-16 21:08:11 | | | | foreign_key_checks | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | log_error | COMMAND_LINE | | 0 | 0 | 2017-04-16 21:08:11 | | | | lower_case_table_names | EXPLICIT | [..]my.sandbox.cnf | 0 | 2 | 2017-04-16 21:08:11 | | | | pid_file | COMMAND_LINE | | 0 | 0 | 2017-04-16 21:08:11 | | | | plugin_dir | COMMAND_LINE | | 0 | 0 | 2017-04-16 21:08:11 | | | | port | COMMAND_LINE | | 0 | 65535 | 2017-04-16 21:08:11 | | | | socket | COMMAND_LINE | | 0 | 0 | 2017-04-16 21:08:11 | | | | sql_mode | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | sql_notes | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | time_zone | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | | tmpdir | EXPLICIT | [..]my.sandbox.cnf | 0 | 0 | 2017-04-16 21:08:11 | | | | unique_checks | DYNAMIC | | 0 | 0 | 2017-04-16 20:56:53 | msandbox | localhost | +------------------------+-----------------+--------------------+-----------+-----------+---------------------+----------+-----------+ 19 rows in set (0.00 sec)
36.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | New! Transactional Data Dictionary • Increased Reliability • Using InnoDB internally for data dictionary – No FRM files – No DB.OPT files – No TRG files – No TRN files – No PAR files • MySQL 8.0 default install no longer contains MyISAM tables. 37
37.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 39 100 schemas times 50 tables (5000 tables) Information Schema Performance 0. 1. 2. 3. 4. Count All Schemas Schema aggregate size stats All Dynamic Table Info All Static Table Info Auto Increments Near Limit Count All Columns Count All Indexes MySQL 8.0 MySQL 5.7 Time in Seconds (Lower is better) Already faster at 7/10 queries in our test suite!
38.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | 30x Faster SELECT TABLE_SCHEMA, TABLE_NAME, TABLE_TYPE, ENGINE, ROW_FORMAT FROM information_schema.tables WHERE TABLE_SCHEMA LIKE 'db%'; 40 Test Performed with 100 schemas, each with 50 tables.
39.
Copyright © 2017,
Oracle and/or its affiliates. All rights reserved. | • Source code now documented with Doxygen • New Plugin Infrastructure • Expanded GIS Support • Expanded Query Hints Support • Improved Scan Query Performance • Improved BLOB Storage • Improved Memcached Interface • InnoDB Auto Increment Persists • Cost Model Improvements • Scalability Improvements • Atomicity in Privileges • Parser Refactoring • Improvements to Temporary Tables • C++11 and Toolchain Improvements • Replication Applier Thread Progress Reports • GTID_PURGED always settable • Undo tablespaces now dynamic • In memory storage engine • New! Improved Parallel Replication • New! SQL Grouping Function • New! Optimizer Trace detailed sort statistics • New! Smaller Package Downloads • New! JSON Aggregate, Pretty print functions • New! JSON performance improvements • New! Expanded Query Hints • New! Improved usability of cost constant configuration 42 All these features plus…
40.
Copyright © 2016,
Oracle and/or its affiliates. All rights reserved. | HVALA NA PAŽNjI pitanja? Bogdan Kecman bogdan.kecman@oracle.com
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