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SELECT * FROM INFORMATION_SCHEMA.INNODB_BUFFER_POOL_STATS;
SELECT count(*) FROM INFORMATION_SCHEMA.INNODB_BUFFER_POOL_STATS;
SELECT * FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE;
SELECT COUNT(*) FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE;
CREATE TABLE infoschema_buffer_test (col1 INT) ENGINE = INNODB;
INSERT INTO infoschema_buffer_test VALUES(9);
SELECT TABLE_NAME, INDEX_NAME, NUMBER_RECORDS, DATA_SIZE, PAGE_STATE, PAGE_TYPE
FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE TABLE_NAME like "%infoschema_buffer_test%"
and PAGE_STATE="file_page" and PAGE_TYPE="index";
TABLE_NAME INDEX_NAME NUMBER_RECORDS DATA_SIZE PAGE_STATE PAGE_TYPE
`test`.`infoschema_buffer_test` GEN_CLUST_INDEX 1 29 FILE_PAGE INDEX
INSERT INTO infoschema_buffer_test VALUES(19);
SELECT TABLE_NAME, INDEX_NAME, NUMBER_RECORDS, DATA_SIZE, PAGE_STATE, PAGE_TYPE
FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE TABLE_NAME like "%infoschema_buffer_test%"
and PAGE_STATE="file_page" and PAGE_TYPE="index";
TABLE_NAME INDEX_NAME NUMBER_RECORDS DATA_SIZE PAGE_STATE PAGE_TYPE
`test`.`infoschema_buffer_test` GEN_CLUST_INDEX 2 58 FILE_PAGE INDEX
CREATE INDEX idx ON infoschema_buffer_test(col1);
SELECT TABLE_NAME, INDEX_NAME, NUMBER_RECORDS, DATA_SIZE, PAGE_STATE, PAGE_TYPE
FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE TABLE_NAME like "%infoschema_buffer_test%"
and PAGE_STATE="file_page" and INDEX_NAME = "idx" and PAGE_TYPE="index";
TABLE_NAME INDEX_NAME NUMBER_RECORDS DATA_SIZE PAGE_STATE PAGE_TYPE
`test`.`infoschema_buffer_test` idx 2 32 FILE_PAGE INDEX
`test`.`infoschema_buffer_test` idx 2 32 FILE_PAGE INDEX
SELECT space, is_stale FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE space = {space_id} GROUP BY space, is_stale;;
space is_stale
{space_id} NO
DROP TABLE infoschema_buffer_test;
SELECT TABLE_NAME, INDEX_NAME, NUMBER_RECORDS, DATA_SIZE, PAGE_STATE, PAGE_TYPE
FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE TABLE_NAME like "%infoschema_buffer_test%";
TABLE_NAME INDEX_NAME NUMBER_RECORDS DATA_SIZE PAGE_STATE PAGE_TYPE
SELECT space, is_stale FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE space = {space_id} GROUP BY space, is_stale;;
space is_stale
{space_id} YES
# Emptying InnoDB buffer pool: begin
# Buffer pool size: 25165824 bytes
# Creating and dropping a table with size: 50331648 bytes
# Emptying InnoDB buffer pool: end
SELECT space, is_stale FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE space = {space_id} GROUP BY space, is_stale;;
space is_stale
CREATE TABLE infoschema_parent (id INT NOT NULL, PRIMARY KEY (id))
ENGINE=INNODB;
CREATE TABLE infoschema_child (id INT, parent_id INT, INDEX par_ind (parent_id),
FOREIGN KEY (parent_id)
REFERENCES infoschema_parent(id)
ON DELETE CASCADE)
ENGINE=INNODB;
SELECT count(*)
FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
WHERE TABLE_NAME like "%infoschema_child%" and PAGE_STATE="file_page"
and PAGE_TYPE="index";
count(*)
2
DROP TABLE infoschema_child;
DROP TABLE infoschema_parent;
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