diff --git a/dbs/bigquery.sql b/dbs/bigquery.sql
deleted file mode 100644
index 9d38911..0000000
--- a/dbs/bigquery.sql
+++ /dev/null
@@ -1,33 +0,0 @@
-DROP TABLE IF EXISTS `dataprep-bigquery.dataprep.test_table`;
-
-CREATE TABLE`dataprep-bigquery.dataprep.test_table`(
-    test_int INT64,
-    test_string STRING,
-    test_float FLOAT64,
-    test_bool BOOL,
-);
-
-INSERT INTO `dataprep-bigquery.dataprep.test_table` VALUES (1, 'str1', 1.1, TRUE);
-INSERT INTO `dataprep-bigquery.dataprep.test_table` VALUES (2, 'str2', 2.2, FALSE);
-INSERT INTO `dataprep-bigquery.dataprep.test_table` VALUES (2333, NULL, NULL, TRUE);
-INSERT INTO `dataprep-bigquery.dataprep.test_table` VALUES (4, NULL, -4.44, FALSE);
-INSERT INTO `dataprep-bigquery.dataprep.test_table` VALUES (5, 'str05', NULL, NULL);
-
-
-DROP TABLE IF EXISTS `dataprep-bigquery.dataprep.test_types`;
-
-CREATE TABLE IF NOT EXISTS `dataprep-bigquery.dataprep.test_types`(
-    test_int INTEGER,
-    test_numeric NUMERIC(5, 2),
-    test_bool BOOL,
-    test_date DATE,
-    test_time TIME,
-    test_datetime DATETIME,
-    test_timestamp TIMESTAMP,
-    test_str STRING,
-    test_bytes BYTES,
-);
-
-INSERT INTO `dataprep-bigquery.dataprep.test_types` VALUES (1, 1.23, TRUE, '1937-01-28', '00:00:00', NULL, '1970-01-01 00:00:01.00Z', '😁😂😜', CAST('😁😂😜' AS BYTES));
-INSERT INTO `dataprep-bigquery.dataprep.test_types` VALUES (2, 234.56, NULL, '2053-07-25', '12:59:59', '2053-07-25 12:59:59', NULL, 'こんにちはЗдра́в', CAST('こんにちはЗдра́в' AS BYTES));
-INSERT INTO `dataprep-bigquery.dataprep.test_types` VALUES (NULL, NULL, FALSE, NULL, NULL, '1937-01-28 00:00:00', '2004-2-29 12:00:01.30+3:00', NULL, NULL);
diff --git a/dbs/clickhouse.sql b/dbs/clickhouse.sql
deleted file mode 100644
index 80e4b9c..0000000
--- a/dbs/clickhouse.sql
+++ /dev/null
@@ -1,31 +0,0 @@
-DROP TABLE IF EXISTS test_table;
-
-CREATE TABLE IF NOT EXISTS test_table(
-    test_int UInt64,
-    test_str String
-) ENGINE = MergeTree()
-PRIMARY KEY test_int;
-
-INSERT INTO test_table VALUES (1, 'abc');
-INSERT INTO test_table VALUES (2, 'defg');
-INSERT INTO test_table VALUES (3, 'hijkl');
-INSERT INTO test_table VALUES (4, 'mnopqr');
-INSERT INTO test_table VALUES (5, 'st');
-INSERT INTO test_table VALUES (6, 'u');
-
-DROP TABLE IF EXISTS test_types;
-
-CREATE TABLE IF NOT EXISTS test_types(
-    test_int Int32,
-    test_float Float64,
-    test_date DATE,
-    test_datetime DATETIME,
-    test_decimal DECIMAL(15,2),
-    test_varchar VARCHAR(15),
-    test_char CHAR(10)
-) ENGINE = MergeTree()
-PRIMARY KEY test_int;
-
-INSERT INTO test_types VALUES (1, 2.3, '1999-07-25', '1999-07-25 23:14:07', 2.22, 'こんにちは', '0123456789');
-INSERT INTO test_types VALUES (2, 3.3, '1979-04-07', '1979-04-07 03:04:37', 3.33, 'Ha好ち😁ðy', 'abcdefghij');
-INSERT INTO test_types VALUES (3, 4.3, '1999-09-22', '1999-07-25 20:21:14', 4.44, 'b', '321');
\ No newline at end of file
diff --git a/dbs/docker-compose.yml b/dbs/docker-compose.yml
index de4a099..3ca3387 100644
--- a/dbs/docker-compose.yml
+++ b/dbs/docker-compose.yml
@@ -8,7 +8,7 @@ services:
       POSTGRES_USER: user
       POSTGRES_PASSWORD: pass
     healthcheck:
-      test: [CMD-SHELL, pg_isready -U user db]
+      test: [CMD-SHELL, pg_isready -U user -d db]
       interval: 5s
       timeout: 5s
       retries: 5
diff --git a/dbs/mem_monitor.sh b/dbs/mem_monitor.sh
deleted file mode 100755
index fc5b659..0000000
--- a/dbs/mem_monitor.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-echo "user: $USER"
-pgid=$(ps -o pgid,comm -u $USER | grep just | awk '{print $1}')
-echo "pgid of command: $pgid"
-max=0
-
-for((i=0;i<1000000;i++))
-do
-    ps -o pid,ppid,pgid,comm,rss -u $USER | grep $pgid
-    sum=$(ps -o pid,ppid,pgid,comm,rss -u $USER | grep $pgid | awk '{sum += $NF} END {print sum}')
-    echo "current sum: $sum"
-    if (( sum > max )); then
-        max=$sum
-    fi
-    echo "current max: $max"
-    [ -z $sum ] && exit 0 || echo "continue..."
-    sleep 2
-done
diff --git a/dbs/mssql.sql b/dbs/mssql.sql
deleted file mode 100644
index 8dbce28..0000000
--- a/dbs/mssql.sql
+++ /dev/null
@@ -1,76 +0,0 @@
-DROP TABLE IF EXISTS test_table;
-
-CREATE TABLE test_table(
-    test_int INTEGER NOT NULL,
-    test_nullint INTEGER,
-    test_str VARCHAR(128),
-    test_float FLOAT(53),
-    test_bool BIT
-);
-
-
-INSERT INTO test_table VALUES (1, 3, 'str1', NULL, 1);
-INSERT INTO test_table VALUES (2, NULL, 'str2', 2.2, 0);
-INSERT INTO test_table VALUES (0, 5, 'a', 3.1, NULL);
-INSERT INTO test_table VALUES (3, 7, 'b', 3, 0);
-INSERT INTO test_table VALUES (4, 9, 'c', 7.8, NULL);
-INSERT INTO test_table VALUES (1314, 2, NULL, -10, 1);
-
-DROP TABLE IF EXISTS test_str;
-CREATE TABLE test_str(
-    id INTEGER NOT NULL,
-    test_language NVARCHAR(max),
-    test_hello NVARCHAR(max),
-);
-
-INSERT INTO test_str VALUES (0, N'English', N'Hello');
-INSERT INTO test_str VALUES (1, N'中文', N'你好');
-INSERT INTO test_str VALUES (2, N'日本語', N'こんにちは');
-INSERT INTO test_str VALUES (3, N'русский', N'Здра́вствуйте');
-INSERT INTO test_str VALUES (4, N'Emoji', N'😁😂😜');
-INSERT INTO test_str VALUES (5, N'Latin1', N'¥§¤®ð');
-INSERT INTO test_str VALUES (6, N'Extra', N'y̆');
-INSERT INTO test_str VALUES (7, N'Mixed', N'Ha好ち😁ðy̆');
-INSERT INTO test_str VALUES (8, N'', NULL);
-
-
-DROP TABLE IF EXISTS test_types;
-
-CREATE TABLE test_types(
-    test_int1 TINYINT,
-​    test_int2 SMALLINT,
-​    test_int4 INT,
-​    test_int8 BIGINT,
-​    test_float24 REAL,
-​    test_float53 DOUBLE PRECISION,
-​    test_floatn FLOAT(18),
-    test_date DATE,
-    test_time TIME,
-    test_datetime DATETIMEOFFSET,
-    test_smalldatetime SMALLDATETIME,
-​    test_naivedatetime DATETIME,
-​    test_naivedatetime2 DATETIME2,
-    test_new_decimal NUMERIC(5, 2),
-    test_decimal DECIMAL,
-    test_varchar VARCHAR(15),
-    test_char CHAR(10),
-    test_varbinary VARBINARY(10),
-    test_binary BINARY(5),
-    test_nchar NCHAR(4),
-    test_text TEXT,
-    test_ntext NTEXT,
-    test_uuid UNIQUEIDENTIFIER,
-    test_money MONEY,
-    test_smallmoney SMALLMONEY
-);
-
-INSERT INTO test_types VALUES (0, -32768, -2147483648, -9223372036854775808, NULL, NULL, NULL, '1999-07-25', '00:00:00', NULL, '1990-01-01 10:00:00', '1753-01-01 12:00:00', '1900-01-01 12:00:00.12345', 1.1, 1, NULL, NULL, NULL, NULL, '1234', 'text', 'ntext', '86b494cc-96b2-11eb-9298-3e22fbb9fe9d', NULL, NULL);
-INSERT INTO test_types VALUES (255, 32767, 2147483647, 9223372036854775807, -1.18E-38, -2.23E-308, 0, NULL, '23:59:59', '2020-12-31 23:59:59 +00:00', NULL, '2038-12-31 01:00:00', NULl, 2.2, 2, 'varchar2', 'char2', CONVERT(VARBINARY(10), '1234'), CONVERT(BINARY(5), '12'), NULL, 't', 'nt', NULL, 922337203685477.5807, 214748.3647);
-INSERT INTO test_types VALUES (NULL, NULL, NULL, NULL, 3.40E+38, 1.79E+308, 123.1234567, '2021-01-28', NULL, '2021-01-28 12:30:30 +01:00', '2079-06-05 23:00:00', NULL, '2027-03-18 14:30:30.54321', NULL, NULL, 'varchar3', 'char3', CONVERT(VARBINARY(10), ''), CONVERT(BINARY(5), ''), '12', NULL, NULL, '86b49b84-96b2-11eb-9298-3e22fbb9fe9d', -922337203685477.5808, -214748.3648);
-
-CREATE FUNCTION increment(@val int)  
-RETURNS int   
-AS   
-BEGIN  
-    RETURN @val + 1;  
-END;
\ No newline at end of file
diff --git a/dbs/mysql.sql b/dbs/mysql.sql
deleted file mode 100644
index 7906415..0000000
--- a/dbs/mysql.sql
+++ /dev/null
@@ -1,69 +0,0 @@
-show variables like 'char%';
-
-DROP TABLE IF EXISTS test_table;
-
-CREATE TABLE IF NOT EXISTS test_table(
-    test_int INTEGER,
-    test_float DOUBLE,
-    test_enum ENUM('even', 'odd'),
-    test_null INTEGER
-);
-
-INSERT INTO test_table VALUES (1, 1.1, 'odd', NULL);
-INSERT INTO test_table VALUES (2, 2.2,'even',  NULL);
-INSERT INTO test_table VALUES (3, 3.3, 'odd', NULL);
-INSERT INTO test_table VALUES (4, 4.4, 'even', NULL);
-INSERT INTO test_table VALUES (5, 5.5, 'odd', NULL);
-INSERT INTO test_table VALUES (6, 6.6, 'even', NULL);
-
-
-DROP TABLE IF EXISTS test_table_extra;
-
-CREATE TABLE IF NOT EXISTS test_table_extra(
-    test_int INTEGER,
-    test_str VARCHAR(30)
-);
-
-INSERT INTO test_table_extra VALUES (1, 'Ha好ち😁ðy̆');
-INSERT INTO test_table_extra VALUES (2, 'こんにちは');
-INSERT INTO test_table_extra VALUES (3, 'русский');
-
-DROP TABLE IF EXISTS test_types;
-
-CREATE TABLE IF NOT EXISTS test_types(
-    test_timestamp TIMESTAMP NULL,
-    test_date DATE,
-    test_time TIME,
-    test_datetime DATETIME,
-    test_new_decimal DECIMAL(15,2),
-    test_decimal DECIMAL,
-    test_varchar VARCHAR(15),
-    test_char CHAR(10),
-    test_tiny TINYINT,
-    test_short SMALLINT,
-    test_int24 MEDIUMINT,
-    test_long INT,
-    test_longlong BIGINT,
-    test_tiny_unsigned TINYINT UNSIGNED,
-    test_short_unsigned SMALLINT UNSIGNED,
-    test_int24_unsigned MEDIUMINT UNSIGNED,
-    test_long_unsigned INT UNSIGNED,
-    test_longlong_unsigned BIGINT UNSIGNED,
-    test_long_notnull INT NOT NULL,
-    test_short_unsigned_notnull SMALLINT UNSIGNED NOT NULL,
-    test_float FLOAT,
-    test_double DOUBLE,
-    test_double_notnull DOUBLE NOT NULL,
-    test_year YEAR,
-    test_tinyblob TINYBLOB,
-    test_blob BLOB,
-    test_mediumblob MEDIUMBLOB,
-    test_longblob LONGBLOB,
-    test_enum ENUM('apple', 'banana', 'orange', 'mango'),
-    test_json JSON,
-    test_mediumtext MEDIUMTEXT
-);
-
-INSERT INTO test_types VALUES ('1970-01-01 00:00:01', NULL, '00:00:00', '1970-01-01 00:00:01', 1.1, 1, NULL, 'char1', -128, -32768, -8388608, -2147483648, -9223372036854775808, NULL, NULL, NULL, NULL, NULL, 1, 1, NULL, -2.2E-308, 1.2345, 1901, NULL, NULL, NULL, NULL, 'apple', '{"name": "piggy", "age": 1}', NULL);
-INSERT INTO test_types VALUES ('2038-01-19 00:00:00', '1970-01-01', NULL, '2038-01-19 00:0:00', NULL, 2, 'varchar2', NULL, 127, 32767, 8388607, 2147483647, 9223372036854775807, 255, 65535, 16777215, 4294967295, 1.844674407E19, 2147483647, 65535, -1.1E-38, NULL, -1.1E-3, 2155, 'tinyblob2', 'blobblobblobblob2', 'mediumblob2', 'longblob2', NULL, '{"name": "kitty", "age": 2}', '');
-INSERT INTO test_types VALUES (NULL, '2038-01-19', '23:59:59', NULL, 3.3, NULL, 'varchar3', 'char3', NULL, NULL, NULL, NULL, NULL, 0, 0, 0, 0, 0, -2147483648, 0, 3.4E38, 1.7E308, 1.7E30, NULL, 'tinyblob3', 'blobblobblobblob3', 'mediumblob3', 'longblob3', 'mango', NULL, 'medium text!!!!');
\ No newline at end of file
diff --git a/dbs/oracle.sql b/dbs/oracle.sql
deleted file mode 100644
index e70766e..0000000
--- a/dbs/oracle.sql
+++ /dev/null
@@ -1,52 +0,0 @@
-DROP TABLE test_table;
-DROP TABLE test_types;
-DROP TABLE test_issue;
-
-CREATE TABLE test_table(
-    test_int NUMBER(7),
-    test_char CHAR(5),
-    test_float FLOAT(53)
-);
-
-INSERT INTO test_table VALUES (1, 'str1', 1.1);
-INSERT INTO test_table VALUES (2, 'str2', 2.2);
-INSERT INTO test_table VALUES (2333, NULL, NULL);
-INSERT INTO test_table VALUES (4, NULL, -4.44);
-INSERT INTO test_table VALUES (5, 'str05', NULL);
-
-CREATE TABLE test_issue(
-    v BINARY_FLOAT
-);
-
-INSERT INTO test_issue VALUES (1.111);
-INSERT INTO test_issue VALUES (2.222);
-INSERT INTO test_issue VALUES (3.333);
-INSERT INTO test_issue VALUES (NULL);
-
-
-CREATE TABLE test_types(
-    test_num_int NUMBER(8),
-    test_int INTEGER,
-    test_num_float NUMBER(10,1),
-    test_float FLOAT(38),
-    test_binary_float BINARY_FLOAT,
-    test_binary_double BINARY_DOUBLE,
-    test_char CHAR(5),
-    test_varchar VARCHAR2(10),
-    test_nchar NCHAR(6),
-    test_nvarchar NVARCHAR2(20),
-    test_date DATE,
-    test_timestamp TIMESTAMP,
-    test_timestamptz TIMESTAMP WITH TIME ZONE,
-    test_clob CLOB,
-    test_blob BLOB
-);
-
-
-INSERT INTO test_types VALUES (1, -10, 2.3, 2.34, -3.456, 9999.99991, 'char1', 'varchar1', 'y123', 'aK>?KJ@#$%', TO_DATE('2019-05-21', 'YYYY-MM-DD'), TO_TIMESTAMP('2019-05-21 01:02:33', 'YYYY-MM-DD HH24:MI:SS'), TO_TIMESTAMP_TZ('1999-12-01 11:00:00 -8:00',
-   'YYYY-MM-DD HH:MI:SS TZH:TZM'), '13ab', '39af');
-INSERT INTO test_types VALUES (5, 22, -0.1, 123.455, 3.1415926535, -111111.2345, 'char2', 'varchar222', 'aab123', ')>KDS)(F*&%J', TO_DATE('2020-05-21', 'YYYY-MM-DD'), TO_TIMESTAMP('2020-05-21 01:02:33', 'YYYY-MM-DD HH24:MI:SS'), TO_TIMESTAMP_TZ('1899-12-01 11:00:00 +1:00',
-   'YYYY-MM-DD HH:MI:SS TZH:TZM'), '13ab', '39af');
-INSERT INTO test_types VALUES (5, 22, -0.1, 123.455, 3.1415926535, -111111.2345, 'char2', 'varchar222', 'aab123', ')>KDS)(F*&%J', TO_DATE('2020-05-21', 'YYYY-MM-DD'), TO_TIMESTAMP('2020-05-21 01:02:33', 'YYYY-MM-DD HH24:MI:SS'), TO_TIMESTAMP_TZ('1899-12-01 11:00:00 +1:00',
-   'YYYY-MM-DD HH:MI:SS TZH:TZM'), '13ab', '39af');
-INSERT INTO test_types VALUES (NULL, 100, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
diff --git a/dbs/redshift.sql b/dbs/redshift.sql
deleted file mode 100644
index 5c1ab2a..0000000
--- a/dbs/redshift.sql
+++ /dev/null
@@ -1,45 +0,0 @@
-DROP TABLE IF EXISTS test_table;
-DROP TABLE IF EXISTS test_str;
-DROP TABLE IF EXISTS test_types;
-
-CREATE TABLE IF NOT EXISTS test_table(
-    test_int INTEGER NOT NULL,
-    test_nullint INTEGER,
-    test_str TEXT,
-    test_float DOUBLE PRECISION,
-    test_bool BOOLEAN
-);
-
-INSERT INTO test_table VALUES (1, 3, 'str1', NULL, TRUE);
-INSERT INTO test_table VALUES (2, NULL, 'str2', 2.2, FALSE);
-INSERT INTO test_table VALUES (0, 5, 'a', 3.1, NULL);
-INSERT INTO test_table VALUES (3, 7, 'b', 3, FALSE);
-INSERT INTO test_table VALUES (4, 9, 'c', 7.8, NULL);
-INSERT INTO test_table VALUES (1314, 2, NULL, -10, TRUE);
-
-CREATE TABLE IF NOT EXISTS test_str(
-    id INTEGER NOT NULL,
-    test_language TEXT,
-    test_hello TEXT
-);
-
-INSERT INTO test_str VALUES (0, 'English', 'Hello');
-INSERT INTO test_str VALUES (1, '中文', '你好');
-INSERT INTO test_str VALUES (2, '日本語', 'こんにちは');
-INSERT INTO test_str VALUES (3, 'русский', 'Здра́вствуйте');
-INSERT INTO test_str VALUES (4, 'Emoji', '😁😂😜');
-INSERT INTO test_str VALUES (5, 'Latin1', '¥§¤®ð');
-INSERT INTO test_str VALUES (6, 'Extra', 'y̆');
-INSERT INTO test_str VALUES (7, 'Mixed', 'Ha好ち😁ðy̆');
-
-CREATE TABLE IF NOT EXISTS test_types(
-    test_int16 SMALLINT,
-    test_char CHAR,
-    test_time TIME,
-    test_datetime DATETIME 
-);
-
-INSERT INTO test_types VALUES (0, 'a', '08:12:40', '2007-01-01 10:00:19');
-INSERT INTO test_types VALUES (1, 'b', '10:03:00', '2005-01-01 22:03:00');
-INSERT INTO test_types VALUES (2, 'c', '23:00:10', NULL);
-INSERT INTO test_types VALUES (3, 'd', '18:30:00', '1987-01-01 11:00:00');